Normally Open Relay Wiring

The 0v blue will be attached to the common input and the switching wire black will be attached to the input number.

Normally open relay wiring.

Relays and contactors have two types of contacts each suited for different applications. Pin s 8 6 as normally open pin s 8 5 as normally closed. The following is a wiring diagram of an open collector pnp sensor. The no normally open connection of the relay is not connected until the relay turns on.

When the relay turns on the common move from nc to no. When connecting to the plc the plc input acts as the load. The iso mini relay we have looked at above has 4 pins or terminals on the body and is referred to as a make break relay because there is one high current circuit and a contact that is either open or closed depending upon whether the relay is at rest or energised. How to wire automotive spdt relays.

When current is applied to its coil the generated magnetic field switches the armature and closes the contact so you can say that it turned on the load fan light bulb etc. Mechanical relays create a clicking sound that indicates movement o the common terminal. Pin s 1 3 as normally open pin s 1 4 as normally closed. See my switch terminology page for more on contact arrangements if you need to.

You will notice that the load appears between the 0v blue and switching wire black. Normally closed nc contacts allow current through when the relay or contactor is not energized. The lamp will energize only if someone presses the switch holding its normally open contacts in the closed position normally open switch contacts are sometimes referred to in the electrical industry as form a contacts. Starter kill normally open.

The other pole has. If the contact is broken with the relay at rest then the relay is referred to as normally open no and if. So when wiring up these relays the coil wire s will connect to pins 2 7 on the socket. This normally open starter kill relay application below relies on a ground from the alarm when disarmed and 12 volts from the ignition to enable the driver to start the vehicle.

When a relay is off the common is connected to the nc normally closed. In this episode we will see construction and working of relays and the different types of relays such as normally open and normally closed. Normally open no contacts allow current when the relay or contactor is energized. In other words when voltage is applied to the relay contactor terminals this contact closes.