Is there a kind of relay that only consumes power when switching? Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Switching QuestionRelay switching for audioA relay that behaves like a simple one but doesn't continuously use power?Latching relay - Remember state after power failurename for relay that holds state and only consumes power when toggling statesRC relay range drops dramatically when under load?Need a Switch that Stays Off Once Power is OutRelay sticking when switching mains for LED power supplyIdeal Switching Signal for a Featherwing power Relay boardRelay Sometimes Not Switching

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Is there a kind of relay that only consumes power when switching?



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Switching QuestionRelay switching for audioA relay that behaves like a simple one but doesn't continuously use power?Latching relay - Remember state after power failurename for relay that holds state and only consumes power when toggling statesRC relay range drops dramatically when under load?Need a Switch that Stays Off Once Power is OutRelay sticking when switching mains for LED power supplyIdeal Switching Signal for a Featherwing power Relay boardRelay Sometimes Not Switching



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9












$begingroup$


The relay must stay in its state. When an electrical impulse is sent to it, it should switch its state and should maintain its status.



So I am really curious about it. Is there such a thing for saving lots of power?










share|improve this question









New contributor




Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$


















    9












    $begingroup$


    The relay must stay in its state. When an electrical impulse is sent to it, it should switch its state and should maintain its status.



    So I am really curious about it. Is there such a thing for saving lots of power?










    share|improve this question









    New contributor




    Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.







    $endgroup$














      9












      9








      9





      $begingroup$


      The relay must stay in its state. When an electrical impulse is sent to it, it should switch its state and should maintain its status.



      So I am really curious about it. Is there such a thing for saving lots of power?










      share|improve this question









      New contributor




      Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.







      $endgroup$




      The relay must stay in its state. When an electrical impulse is sent to it, it should switch its state and should maintain its status.



      So I am really curious about it. Is there such a thing for saving lots of power?







      relay






      share|improve this question









      New contributor




      Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited 1 hour ago









      Peter Mortensen

      1,60031422




      1,60031422






      New contributor




      Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked yesterday









      Barış Doğa YavaşBarış Doğa Yavaş

      4612




      4612




      New contributor




      Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      New contributor





      Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Barış Doğa Yavaş is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.




















          6 Answers
          6






          active

          oldest

          votes


















          24












          $begingroup$

          Yes, they go by various names such as a bistable relay, latching relay, or impulse relay. Common in small (telecom style 2A or less) and also some power relays have this function.



          There are various methods of actuating them, the small ones typically have either two coils (pulse one coil for 'on', pulse the other for 'off') or single coil (reverse polarity pulses for on vs. off).



          Some of the power ones are alternating (pulse on, pulse off). One application of the high-power relays is for electrical metering where the power can be remotely switched off in case of bill non-payment by the customer.






          share|improve this answer











          $endgroup$












          • $begingroup$
            But latching relays continues to draw energy for coil inside of it after one o hit the button using relay's second port(I don't know how its called?).
            $endgroup$
            – Barış Doğa Yavaş
            yesterday







          • 4




            $begingroup$
            You control the coil(s) and give it a brief pulse to put it in the desired state. That is typically done with electronics.
            $endgroup$
            – Spehro Pefhany
            yesterday











          • $begingroup$
            latching power relays are also used in ripple control systems.
            $endgroup$
            – Jasen
            yesterday


















          14












          $begingroup$


          But latching relays continues to draw energy for coil inside of it after one o hit the button ...




          You are getting confused with a relay circuit that electrically latches the relay on. A latching relay is bi-stable. It has two stable positions. It uses two coils to switch it - or one but you have to reverse the polarity.



          enter image description here



          Figure 1. A latching relay will stay in the last energised position when power is removed. Source: Homofaciens.






          share|improve this answer









          $endgroup$












          • $begingroup$
            usually the rocker is magnetused middle to both ends (or the fulcrum is magnetised top to bottom)
            $endgroup$
            – Jasen
            yesterday










          • $begingroup$
            Note that there are latching relays with one coil, where you reverse the coil drive to toggle the states.
            $endgroup$
            – Connor Wolf
            yesterday










          • $begingroup$
            reversing the polarity will not help, unless they use diodes to control 2 coils with 2 wires. generally relays are made to be polarity agnostic, so they can be sold to use with AC.
            $endgroup$
            – Harper
            8 hours ago










          • $begingroup$
            @Harper Some of them are, some are not. The more common type of latching relay is called a single-coil latching relay, and they are polarity sensitive.
            $endgroup$
            – Hearth
            8 hours ago










          • $begingroup$
            @Harper: "generally relays are made to be polarity agnostic, ..." Yes, so they can work with DC on either polarity. "... so they can be sold to use with AC ..." I have seen this very rarely. The AC types usually rely on their inductance to limit current and on DC the current would be limited only by the inductance. I seem to remember a particular model rated for 120 V AC / 24 V DC which seemed interesting.
            $endgroup$
            – Transistor
            7 hours ago


















          1












          $begingroup$

          Example of a mechanical latching relays can be found in early telephone exchanges.



          The stepping relay, or Strowger switch, was used to establish a switched circuit through a telephony exchange. Power was used to advance the relay for each click of the dial pulse, but once the digit was complete, the switch held its position.



          More advanced exchanges used crossbar switches which connected more points in less space. These were also latching and did not require power to maintain each specific connection.






          share|improve this answer









          $endgroup$




















            0












            $begingroup$

            In a way, each cell in non-volatile memory (NVRAM) is a latching relay. Each cell stores its state when power is removed and uses no power to remain as it is. Only when the state is changed does the "bit" use power.



            In many implementations of NVRAM, the state is stored as an island of electrical charge stored within an insulating framework. The stored charge influences the ability of current to flow through an adjacent semiconductor channel.






            share|improve this answer









            $endgroup$




















              0












              $begingroup$

              If you want a readily available example, GE makes a line of latching relays called RR7. They are used for commercial lighting. They work exactly as you wish, and run on 24 VAC or DC or voltages in that ballpark.






              share|improve this answer









              $endgroup$




















                0












                $begingroup$

                Also the Half-Bridge FET Relay only consumes power during the switching transition which is proportional to the Q charge on the Gate input and Drain output during switching. However, in normal operation, they are used to also vary voltage with PWM which draws switching power at a higher rate. But the high side of the dual half-bridge or "full-H bridge" bridge is used to change directions of current after flow has stopped with very little power.



                However, IGBT's with FET input are more suited to AC line voltage and require costly protection for line faults or surges.



                Similarily , the Thyristor family of parts only need a pulse to latch-on for the next cycle.






                share|improve this answer











                $endgroup$













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                  6 Answers
                  6






                  active

                  oldest

                  votes








                  6 Answers
                  6






                  active

                  oldest

                  votes









                  active

                  oldest

                  votes






                  active

                  oldest

                  votes









                  24












                  $begingroup$

                  Yes, they go by various names such as a bistable relay, latching relay, or impulse relay. Common in small (telecom style 2A or less) and also some power relays have this function.



                  There are various methods of actuating them, the small ones typically have either two coils (pulse one coil for 'on', pulse the other for 'off') or single coil (reverse polarity pulses for on vs. off).



                  Some of the power ones are alternating (pulse on, pulse off). One application of the high-power relays is for electrical metering where the power can be remotely switched off in case of bill non-payment by the customer.






                  share|improve this answer











                  $endgroup$












                  • $begingroup$
                    But latching relays continues to draw energy for coil inside of it after one o hit the button using relay's second port(I don't know how its called?).
                    $endgroup$
                    – Barış Doğa Yavaş
                    yesterday







                  • 4




                    $begingroup$
                    You control the coil(s) and give it a brief pulse to put it in the desired state. That is typically done with electronics.
                    $endgroup$
                    – Spehro Pefhany
                    yesterday











                  • $begingroup$
                    latching power relays are also used in ripple control systems.
                    $endgroup$
                    – Jasen
                    yesterday















                  24












                  $begingroup$

                  Yes, they go by various names such as a bistable relay, latching relay, or impulse relay. Common in small (telecom style 2A or less) and also some power relays have this function.



                  There are various methods of actuating them, the small ones typically have either two coils (pulse one coil for 'on', pulse the other for 'off') or single coil (reverse polarity pulses for on vs. off).



                  Some of the power ones are alternating (pulse on, pulse off). One application of the high-power relays is for electrical metering where the power can be remotely switched off in case of bill non-payment by the customer.






                  share|improve this answer











                  $endgroup$












                  • $begingroup$
                    But latching relays continues to draw energy for coil inside of it after one o hit the button using relay's second port(I don't know how its called?).
                    $endgroup$
                    – Barış Doğa Yavaş
                    yesterday







                  • 4




                    $begingroup$
                    You control the coil(s) and give it a brief pulse to put it in the desired state. That is typically done with electronics.
                    $endgroup$
                    – Spehro Pefhany
                    yesterday











                  • $begingroup$
                    latching power relays are also used in ripple control systems.
                    $endgroup$
                    – Jasen
                    yesterday













                  24












                  24








                  24





                  $begingroup$

                  Yes, they go by various names such as a bistable relay, latching relay, or impulse relay. Common in small (telecom style 2A or less) and also some power relays have this function.



                  There are various methods of actuating them, the small ones typically have either two coils (pulse one coil for 'on', pulse the other for 'off') or single coil (reverse polarity pulses for on vs. off).



                  Some of the power ones are alternating (pulse on, pulse off). One application of the high-power relays is for electrical metering where the power can be remotely switched off in case of bill non-payment by the customer.






                  share|improve this answer











                  $endgroup$



                  Yes, they go by various names such as a bistable relay, latching relay, or impulse relay. Common in small (telecom style 2A or less) and also some power relays have this function.



                  There are various methods of actuating them, the small ones typically have either two coils (pulse one coil for 'on', pulse the other for 'off') or single coil (reverse polarity pulses for on vs. off).



                  Some of the power ones are alternating (pulse on, pulse off). One application of the high-power relays is for electrical metering where the power can be remotely switched off in case of bill non-payment by the customer.







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited yesterday









                  duskwuff

                  18.2k32853




                  18.2k32853










                  answered yesterday









                  Spehro PefhanySpehro Pefhany

                  214k5163436




                  214k5163436











                  • $begingroup$
                    But latching relays continues to draw energy for coil inside of it after one o hit the button using relay's second port(I don't know how its called?).
                    $endgroup$
                    – Barış Doğa Yavaş
                    yesterday







                  • 4




                    $begingroup$
                    You control the coil(s) and give it a brief pulse to put it in the desired state. That is typically done with electronics.
                    $endgroup$
                    – Spehro Pefhany
                    yesterday











                  • $begingroup$
                    latching power relays are also used in ripple control systems.
                    $endgroup$
                    – Jasen
                    yesterday
















                  • $begingroup$
                    But latching relays continues to draw energy for coil inside of it after one o hit the button using relay's second port(I don't know how its called?).
                    $endgroup$
                    – Barış Doğa Yavaş
                    yesterday







                  • 4




                    $begingroup$
                    You control the coil(s) and give it a brief pulse to put it in the desired state. That is typically done with electronics.
                    $endgroup$
                    – Spehro Pefhany
                    yesterday











                  • $begingroup$
                    latching power relays are also used in ripple control systems.
                    $endgroup$
                    – Jasen
                    yesterday















                  $begingroup$
                  But latching relays continues to draw energy for coil inside of it after one o hit the button using relay's second port(I don't know how its called?).
                  $endgroup$
                  – Barış Doğa Yavaş
                  yesterday





                  $begingroup$
                  But latching relays continues to draw energy for coil inside of it after one o hit the button using relay's second port(I don't know how its called?).
                  $endgroup$
                  – Barış Doğa Yavaş
                  yesterday





                  4




                  4




                  $begingroup$
                  You control the coil(s) and give it a brief pulse to put it in the desired state. That is typically done with electronics.
                  $endgroup$
                  – Spehro Pefhany
                  yesterday





                  $begingroup$
                  You control the coil(s) and give it a brief pulse to put it in the desired state. That is typically done with electronics.
                  $endgroup$
                  – Spehro Pefhany
                  yesterday













                  $begingroup$
                  latching power relays are also used in ripple control systems.
                  $endgroup$
                  – Jasen
                  yesterday




                  $begingroup$
                  latching power relays are also used in ripple control systems.
                  $endgroup$
                  – Jasen
                  yesterday













                  14












                  $begingroup$


                  But latching relays continues to draw energy for coil inside of it after one o hit the button ...




                  You are getting confused with a relay circuit that electrically latches the relay on. A latching relay is bi-stable. It has two stable positions. It uses two coils to switch it - or one but you have to reverse the polarity.



                  enter image description here



                  Figure 1. A latching relay will stay in the last energised position when power is removed. Source: Homofaciens.






                  share|improve this answer









                  $endgroup$












                  • $begingroup$
                    usually the rocker is magnetused middle to both ends (or the fulcrum is magnetised top to bottom)
                    $endgroup$
                    – Jasen
                    yesterday










                  • $begingroup$
                    Note that there are latching relays with one coil, where you reverse the coil drive to toggle the states.
                    $endgroup$
                    – Connor Wolf
                    yesterday










                  • $begingroup$
                    reversing the polarity will not help, unless they use diodes to control 2 coils with 2 wires. generally relays are made to be polarity agnostic, so they can be sold to use with AC.
                    $endgroup$
                    – Harper
                    8 hours ago










                  • $begingroup$
                    @Harper Some of them are, some are not. The more common type of latching relay is called a single-coil latching relay, and they are polarity sensitive.
                    $endgroup$
                    – Hearth
                    8 hours ago










                  • $begingroup$
                    @Harper: "generally relays are made to be polarity agnostic, ..." Yes, so they can work with DC on either polarity. "... so they can be sold to use with AC ..." I have seen this very rarely. The AC types usually rely on their inductance to limit current and on DC the current would be limited only by the inductance. I seem to remember a particular model rated for 120 V AC / 24 V DC which seemed interesting.
                    $endgroup$
                    – Transistor
                    7 hours ago















                  14












                  $begingroup$


                  But latching relays continues to draw energy for coil inside of it after one o hit the button ...




                  You are getting confused with a relay circuit that electrically latches the relay on. A latching relay is bi-stable. It has two stable positions. It uses two coils to switch it - or one but you have to reverse the polarity.



                  enter image description here



                  Figure 1. A latching relay will stay in the last energised position when power is removed. Source: Homofaciens.






                  share|improve this answer









                  $endgroup$












                  • $begingroup$
                    usually the rocker is magnetused middle to both ends (or the fulcrum is magnetised top to bottom)
                    $endgroup$
                    – Jasen
                    yesterday










                  • $begingroup$
                    Note that there are latching relays with one coil, where you reverse the coil drive to toggle the states.
                    $endgroup$
                    – Connor Wolf
                    yesterday










                  • $begingroup$
                    reversing the polarity will not help, unless they use diodes to control 2 coils with 2 wires. generally relays are made to be polarity agnostic, so they can be sold to use with AC.
                    $endgroup$
                    – Harper
                    8 hours ago










                  • $begingroup$
                    @Harper Some of them are, some are not. The more common type of latching relay is called a single-coil latching relay, and they are polarity sensitive.
                    $endgroup$
                    – Hearth
                    8 hours ago










                  • $begingroup$
                    @Harper: "generally relays are made to be polarity agnostic, ..." Yes, so they can work with DC on either polarity. "... so they can be sold to use with AC ..." I have seen this very rarely. The AC types usually rely on their inductance to limit current and on DC the current would be limited only by the inductance. I seem to remember a particular model rated for 120 V AC / 24 V DC which seemed interesting.
                    $endgroup$
                    – Transistor
                    7 hours ago













                  14












                  14








                  14





                  $begingroup$


                  But latching relays continues to draw energy for coil inside of it after one o hit the button ...




                  You are getting confused with a relay circuit that electrically latches the relay on. A latching relay is bi-stable. It has two stable positions. It uses two coils to switch it - or one but you have to reverse the polarity.



                  enter image description here



                  Figure 1. A latching relay will stay in the last energised position when power is removed. Source: Homofaciens.






                  share|improve this answer









                  $endgroup$




                  But latching relays continues to draw energy for coil inside of it after one o hit the button ...




                  You are getting confused with a relay circuit that electrically latches the relay on. A latching relay is bi-stable. It has two stable positions. It uses two coils to switch it - or one but you have to reverse the polarity.



                  enter image description here



                  Figure 1. A latching relay will stay in the last energised position when power is removed. Source: Homofaciens.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered yesterday









                  TransistorTransistor

                  89k785191




                  89k785191











                  • $begingroup$
                    usually the rocker is magnetused middle to both ends (or the fulcrum is magnetised top to bottom)
                    $endgroup$
                    – Jasen
                    yesterday










                  • $begingroup$
                    Note that there are latching relays with one coil, where you reverse the coil drive to toggle the states.
                    $endgroup$
                    – Connor Wolf
                    yesterday










                  • $begingroup$
                    reversing the polarity will not help, unless they use diodes to control 2 coils with 2 wires. generally relays are made to be polarity agnostic, so they can be sold to use with AC.
                    $endgroup$
                    – Harper
                    8 hours ago










                  • $begingroup$
                    @Harper Some of them are, some are not. The more common type of latching relay is called a single-coil latching relay, and they are polarity sensitive.
                    $endgroup$
                    – Hearth
                    8 hours ago










                  • $begingroup$
                    @Harper: "generally relays are made to be polarity agnostic, ..." Yes, so they can work with DC on either polarity. "... so they can be sold to use with AC ..." I have seen this very rarely. The AC types usually rely on their inductance to limit current and on DC the current would be limited only by the inductance. I seem to remember a particular model rated for 120 V AC / 24 V DC which seemed interesting.
                    $endgroup$
                    – Transistor
                    7 hours ago
















                  • $begingroup$
                    usually the rocker is magnetused middle to both ends (or the fulcrum is magnetised top to bottom)
                    $endgroup$
                    – Jasen
                    yesterday










                  • $begingroup$
                    Note that there are latching relays with one coil, where you reverse the coil drive to toggle the states.
                    $endgroup$
                    – Connor Wolf
                    yesterday










                  • $begingroup$
                    reversing the polarity will not help, unless they use diodes to control 2 coils with 2 wires. generally relays are made to be polarity agnostic, so they can be sold to use with AC.
                    $endgroup$
                    – Harper
                    8 hours ago










                  • $begingroup$
                    @Harper Some of them are, some are not. The more common type of latching relay is called a single-coil latching relay, and they are polarity sensitive.
                    $endgroup$
                    – Hearth
                    8 hours ago










                  • $begingroup$
                    @Harper: "generally relays are made to be polarity agnostic, ..." Yes, so they can work with DC on either polarity. "... so they can be sold to use with AC ..." I have seen this very rarely. The AC types usually rely on their inductance to limit current and on DC the current would be limited only by the inductance. I seem to remember a particular model rated for 120 V AC / 24 V DC which seemed interesting.
                    $endgroup$
                    – Transistor
                    7 hours ago















                  $begingroup$
                  usually the rocker is magnetused middle to both ends (or the fulcrum is magnetised top to bottom)
                  $endgroup$
                  – Jasen
                  yesterday




                  $begingroup$
                  usually the rocker is magnetused middle to both ends (or the fulcrum is magnetised top to bottom)
                  $endgroup$
                  – Jasen
                  yesterday












                  $begingroup$
                  Note that there are latching relays with one coil, where you reverse the coil drive to toggle the states.
                  $endgroup$
                  – Connor Wolf
                  yesterday




                  $begingroup$
                  Note that there are latching relays with one coil, where you reverse the coil drive to toggle the states.
                  $endgroup$
                  – Connor Wolf
                  yesterday












                  $begingroup$
                  reversing the polarity will not help, unless they use diodes to control 2 coils with 2 wires. generally relays are made to be polarity agnostic, so they can be sold to use with AC.
                  $endgroup$
                  – Harper
                  8 hours ago




                  $begingroup$
                  reversing the polarity will not help, unless they use diodes to control 2 coils with 2 wires. generally relays are made to be polarity agnostic, so they can be sold to use with AC.
                  $endgroup$
                  – Harper
                  8 hours ago












                  $begingroup$
                  @Harper Some of them are, some are not. The more common type of latching relay is called a single-coil latching relay, and they are polarity sensitive.
                  $endgroup$
                  – Hearth
                  8 hours ago




                  $begingroup$
                  @Harper Some of them are, some are not. The more common type of latching relay is called a single-coil latching relay, and they are polarity sensitive.
                  $endgroup$
                  – Hearth
                  8 hours ago












                  $begingroup$
                  @Harper: "generally relays are made to be polarity agnostic, ..." Yes, so they can work with DC on either polarity. "... so they can be sold to use with AC ..." I have seen this very rarely. The AC types usually rely on their inductance to limit current and on DC the current would be limited only by the inductance. I seem to remember a particular model rated for 120 V AC / 24 V DC which seemed interesting.
                  $endgroup$
                  – Transistor
                  7 hours ago




                  $begingroup$
                  @Harper: "generally relays are made to be polarity agnostic, ..." Yes, so they can work with DC on either polarity. "... so they can be sold to use with AC ..." I have seen this very rarely. The AC types usually rely on their inductance to limit current and on DC the current would be limited only by the inductance. I seem to remember a particular model rated for 120 V AC / 24 V DC which seemed interesting.
                  $endgroup$
                  – Transistor
                  7 hours ago











                  1












                  $begingroup$

                  Example of a mechanical latching relays can be found in early telephone exchanges.



                  The stepping relay, or Strowger switch, was used to establish a switched circuit through a telephony exchange. Power was used to advance the relay for each click of the dial pulse, but once the digit was complete, the switch held its position.



                  More advanced exchanges used crossbar switches which connected more points in less space. These were also latching and did not require power to maintain each specific connection.






                  share|improve this answer









                  $endgroup$

















                    1












                    $begingroup$

                    Example of a mechanical latching relays can be found in early telephone exchanges.



                    The stepping relay, or Strowger switch, was used to establish a switched circuit through a telephony exchange. Power was used to advance the relay for each click of the dial pulse, but once the digit was complete, the switch held its position.



                    More advanced exchanges used crossbar switches which connected more points in less space. These were also latching and did not require power to maintain each specific connection.






                    share|improve this answer









                    $endgroup$















                      1












                      1








                      1





                      $begingroup$

                      Example of a mechanical latching relays can be found in early telephone exchanges.



                      The stepping relay, or Strowger switch, was used to establish a switched circuit through a telephony exchange. Power was used to advance the relay for each click of the dial pulse, but once the digit was complete, the switch held its position.



                      More advanced exchanges used crossbar switches which connected more points in less space. These were also latching and did not require power to maintain each specific connection.






                      share|improve this answer









                      $endgroup$



                      Example of a mechanical latching relays can be found in early telephone exchanges.



                      The stepping relay, or Strowger switch, was used to establish a switched circuit through a telephony exchange. Power was used to advance the relay for each click of the dial pulse, but once the digit was complete, the switch held its position.



                      More advanced exchanges used crossbar switches which connected more points in less space. These were also latching and did not require power to maintain each specific connection.







                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered 15 hours ago









                      cmmcmm

                      21613




                      21613





















                          0












                          $begingroup$

                          In a way, each cell in non-volatile memory (NVRAM) is a latching relay. Each cell stores its state when power is removed and uses no power to remain as it is. Only when the state is changed does the "bit" use power.



                          In many implementations of NVRAM, the state is stored as an island of electrical charge stored within an insulating framework. The stored charge influences the ability of current to flow through an adjacent semiconductor channel.






                          share|improve this answer









                          $endgroup$

















                            0












                            $begingroup$

                            In a way, each cell in non-volatile memory (NVRAM) is a latching relay. Each cell stores its state when power is removed and uses no power to remain as it is. Only when the state is changed does the "bit" use power.



                            In many implementations of NVRAM, the state is stored as an island of electrical charge stored within an insulating framework. The stored charge influences the ability of current to flow through an adjacent semiconductor channel.






                            share|improve this answer









                            $endgroup$















                              0












                              0








                              0





                              $begingroup$

                              In a way, each cell in non-volatile memory (NVRAM) is a latching relay. Each cell stores its state when power is removed and uses no power to remain as it is. Only when the state is changed does the "bit" use power.



                              In many implementations of NVRAM, the state is stored as an island of electrical charge stored within an insulating framework. The stored charge influences the ability of current to flow through an adjacent semiconductor channel.






                              share|improve this answer









                              $endgroup$



                              In a way, each cell in non-volatile memory (NVRAM) is a latching relay. Each cell stores its state when power is removed and uses no power to remain as it is. Only when the state is changed does the "bit" use power.



                              In many implementations of NVRAM, the state is stored as an island of electrical charge stored within an insulating framework. The stored charge influences the ability of current to flow through an adjacent semiconductor channel.







                              share|improve this answer












                              share|improve this answer



                              share|improve this answer










                              answered 16 hours ago









                              cmmcmm

                              21613




                              21613





















                                  0












                                  $begingroup$

                                  If you want a readily available example, GE makes a line of latching relays called RR7. They are used for commercial lighting. They work exactly as you wish, and run on 24 VAC or DC or voltages in that ballpark.






                                  share|improve this answer









                                  $endgroup$

















                                    0












                                    $begingroup$

                                    If you want a readily available example, GE makes a line of latching relays called RR7. They are used for commercial lighting. They work exactly as you wish, and run on 24 VAC or DC or voltages in that ballpark.






                                    share|improve this answer









                                    $endgroup$















                                      0












                                      0








                                      0





                                      $begingroup$

                                      If you want a readily available example, GE makes a line of latching relays called RR7. They are used for commercial lighting. They work exactly as you wish, and run on 24 VAC or DC or voltages in that ballpark.






                                      share|improve this answer









                                      $endgroup$



                                      If you want a readily available example, GE makes a line of latching relays called RR7. They are used for commercial lighting. They work exactly as you wish, and run on 24 VAC or DC or voltages in that ballpark.







                                      share|improve this answer












                                      share|improve this answer



                                      share|improve this answer










                                      answered 8 hours ago









                                      HarperHarper

                                      6,957927




                                      6,957927





















                                          0












                                          $begingroup$

                                          Also the Half-Bridge FET Relay only consumes power during the switching transition which is proportional to the Q charge on the Gate input and Drain output during switching. However, in normal operation, they are used to also vary voltage with PWM which draws switching power at a higher rate. But the high side of the dual half-bridge or "full-H bridge" bridge is used to change directions of current after flow has stopped with very little power.



                                          However, IGBT's with FET input are more suited to AC line voltage and require costly protection for line faults or surges.



                                          Similarily , the Thyristor family of parts only need a pulse to latch-on for the next cycle.






                                          share|improve this answer











                                          $endgroup$

















                                            0












                                            $begingroup$

                                            Also the Half-Bridge FET Relay only consumes power during the switching transition which is proportional to the Q charge on the Gate input and Drain output during switching. However, in normal operation, they are used to also vary voltage with PWM which draws switching power at a higher rate. But the high side of the dual half-bridge or "full-H bridge" bridge is used to change directions of current after flow has stopped with very little power.



                                            However, IGBT's with FET input are more suited to AC line voltage and require costly protection for line faults or surges.



                                            Similarily , the Thyristor family of parts only need a pulse to latch-on for the next cycle.






                                            share|improve this answer











                                            $endgroup$















                                              0












                                              0








                                              0





                                              $begingroup$

                                              Also the Half-Bridge FET Relay only consumes power during the switching transition which is proportional to the Q charge on the Gate input and Drain output during switching. However, in normal operation, they are used to also vary voltage with PWM which draws switching power at a higher rate. But the high side of the dual half-bridge or "full-H bridge" bridge is used to change directions of current after flow has stopped with very little power.



                                              However, IGBT's with FET input are more suited to AC line voltage and require costly protection for line faults or surges.



                                              Similarily , the Thyristor family of parts only need a pulse to latch-on for the next cycle.






                                              share|improve this answer











                                              $endgroup$



                                              Also the Half-Bridge FET Relay only consumes power during the switching transition which is proportional to the Q charge on the Gate input and Drain output during switching. However, in normal operation, they are used to also vary voltage with PWM which draws switching power at a higher rate. But the high side of the dual half-bridge or "full-H bridge" bridge is used to change directions of current after flow has stopped with very little power.



                                              However, IGBT's with FET input are more suited to AC line voltage and require costly protection for line faults or surges.



                                              Similarily , the Thyristor family of parts only need a pulse to latch-on for the next cycle.







                                              share|improve this answer














                                              share|improve this answer



                                              share|improve this answer








                                              edited 7 hours ago

























                                              answered 8 hours ago









                                              Sunnyskyguy EE75Sunnyskyguy EE75

                                              71.9k227103




                                              71.9k227103




















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