Normally Open Contact Numbers

The contacts are open when the energizing force magnet or relay solenoid is not present. If it is a high limit such as a temperature alarm then the current temperature is below the limit. 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.

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87b normally open contact.

Normally open contact numbers.

When the energizing force is present the contact will close. Of these contact forms the following are particularly common. This is simply the state that the contact is in when something else is not affecting it. Din 72552 defines contact numbers in relays for automotive use.

Energizing it and switching it on will close the contact causing it to allow current flow. If it is a switch then it is off. 87a normally closed contact. If it is a relay then it is not energized.

In other words when voltage is applied to the relay contactor terminals this contact closes. Normally open no contacts allow current when the relay or contactor is energized. 85 relay coil 86 relay coil 87 common contact. An alternate notation for form a is spst no.

Form a contacts make contacts are normally open contacts. Normally open is a contact that does not flow current in its normal state. When voltage is applied this contact opens and interrupts current. 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.

Normally closed nc contacts allow current through when the relay or contactor is not energized.

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