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NC dpst switch

Double Pole Single Throw DPST Relay

The Double Pole Single Throw DPST relay is the equivalent of 2 SPST switches (NO Normally Open and NC Normaly Closed) and can be used to switch 2 different loads.

We have 2 scenarios depending on the type of relay

  • without voltage on coil:
    • with a NO the loads will be OFF because the current cannot flow
    • with a NC the loads will be ON because the current can flow
  • with voltage on coil:
    • with a NO the loads will be ON because the current can flow
    • with a NC the loads will be OFF because the current cannot flow

Normally Open DPST relay connects 2 loads when voltage is applied

NO dpst relay

As you can see in the schematics above if we use a NO DPST relay the contacts will be closed only if voltage is applied to the coil.

Normally Closed DPST relay disconnects 2 loads when voltage is applied

NC dpst relay

In the schematics above if we use a NC DPST relay the contacts will be closed without voltage being applied to the coil and opened when we apply voltage to it.

 

Related product: Electromechanical Relay

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