Normally Open Relay Contact

When power is introduced an electromagnet pulls the first circuit into contact with the second thereby closing the circuit and allowing power to flow through.

Normally open relay contact.

The circuit is disconnected when the relay is inactive. Unlike open contacts with normally closed contacts signal will interrupt a contact or turn a relay off. Normally open contacts would represent relay contacts that would perform a connection upon receipt of a signal. The no normally open spst single pole single throw relay has an opened circuit state when no current is applied to its coil so basically it disconnects the power to the load in the inactive state.

If it is a switch then it is off. As relay diagrams show when a relay contact is normally open no there is an open contact when the relay is not energized. This is simply the state that the contact is in when something else is not affecting it. A form b would mean the contacts are normally closed when the coil of the relay is not energized or the there is no magnetic field nearby in a reed switch.

In other words when voltage is applied to the relay contactor terminals this contact closes. If it is a high limit such as a temperature alarm then the current temperature is below the limit. If when a relay coil has 0 volts two contacts make a. The state conditions normally open no and normally closed refer how the contacts sit when the switch is off relay coil voltage is 0 etc.

Normally closed nc contacts allow current through when the relay or contactor is not energized. Normally open relays default in the open position meaning that when they re not in use there is no contact between the circuits. Form a contacts make contacts are normally open contacts. The contacts are open when the energizing force magnet or relay solenoid is not present.

Normally closed nc contacts disconnect the circuit when the relay is activated. Normally open no contacts connect the circuit when the relay is activated. When the energizing force is present the contact will close. Relays control one electrical circuit by opening and closing contacts in another circuit.

Normally open is a contact. When voltage is applied this contact opens and interrupts current. A form c would. If it is a relay then it is not energized.

Normally open no contacts allow current when the relay or contactor is energized. The circuit is connected when the relay is inactive. When a relay contact is normally closed nc there is a closed contact when the relay is not energized. Of these contact forms the following are particularly common.