What distinguishes B contacts from A contacts?

B contacts are distinguished from A contacts primarily by their operational relationship with the circuit breaker. Specifically, B contacts are typically associated with the positions of the breaker and function in a manner that reflects its status. They are opposite to the A contacts, meaning when the breaker is closed (on), the A contacts are closed while the B contacts are open. Conversely, when the breaker is open (off), the A contacts are open and the B contacts are closed. This opposite operation provides a clear signal regarding the state of the circuit breaker, which is crucial in control and safety systems.

The other considerations regarding B contacts, such as whether they are normally closed or operate independently of the breaker, are secondary to this fundamental distinction. B contacts primarily indicate the breaker’s position, making them essential for understanding how they function in conjunction with A contacts.