Normally Open Contact Numbers

Din 72552 defines contact numbers in relays for automotive use. 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. This is simply the state that the contact is in when something else is not affecting it.

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Energizing it and switching it on will close the contact causing it to allow current flow.

Normally open contact numbers.

If it is a switch then it is off. If it is a relay then it is not energized. 87a normally closed contact. 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.

85 relay coil 86 relay coil 87 common contact. The contacts are open when the energizing force magnet or relay solenoid is not present. An alternate notation for form a is spst no. 87b normally open contact.

Normally closed nc contacts allow current through when the relay or contactor is not energized. When the energizing force is present the contact will close. When voltage is applied this contact opens and interrupts current. Form a contacts make contacts are normally open contacts.

Normally open is a contact that does not flow current in its normal state. If it is a high limit such as a temperature alarm then the current temperature is below the limit. 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.

Of these contact forms the following are particularly common.

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