Double Pole Double Throw (DPDT) Relay
|First terminal of the coil
|Second terminal of the coil
|Normally closed - connected to P1 when coil unpowered
|Normally open - connected to P1 when coil powered
|Normally closed - connected to P2 when coil unpowered
|Normally open - connected to P2 when coil powered
The relay is an electronic switch with two states: coil unpowered, and coil powered. By default, the coil is unpowered. You can power the coil by applying voltage between the pins COIL1 and COIL2.
When the coil is unpowered, P1 is connected to NC1, and P2 is connected to NC2 (NC means normally closed/connected).
When the coil is powered, P1 is connected to NO1, and P2 is connected to NO2 (NO means normally open/disconnected).
The following diagram summarizes the states of the relay: