Normally Open Contact Numbers

If it is a relay then it is not energized. Normally closed nc contacts allow current through when the relay or contactor is not energized. Out coils a plc output is really just an internal relay with a physical connection that can supply electrical power to control an external load.

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Normally open is a contact that does not flow current in its normal state.

Normally open contact numbers.

If it is a high limit such as a temperature alarm then the current temperature is below the limit. The contacts are open when the energizing force magnet or relay solenoid is not present. When voltage is applied this contact opens and interrupts current. This is simply the state that the contact is in when something else is not affecting it.

Form a contacts make contacts are normally open contacts. 87a normally closed contact. 85 relay coil 86 relay coil 87 common contact. Energizing it and switching it on will close the contact causing it to allow current flow.

Din 72552 defines contact numbers in relays for automotive use. Normally open no contacts allow current when the relay or contactor is energized. 87b normally open contact. An alternate notation for form a is spst no.

In other words when voltage is applied to the relay contactor terminals this contact closes. Of these contact forms the following are particularly common. If it is a switch then it is off. A relay contact in the ladder diagram can be normally open or normally closed and there is no limit to the number of contacts a relay can have.

When the energizing force is present the contact will close.

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