What is the role of the A contact in a breaker’s auxiliary switch setup?

The role of an A contact in a breaker’s auxiliary switch setup is to follow the same state as the breaker. This means that when the main breaker is closed, the A contact will also be in a closed position, and conversely, when the main breaker is open, the A contact will open. This behavior allows for real-time monitoring of the breaker’s status, providing reliable feedback for control systems and ensuring that operations can be effectively managed.

The functionality of the A contact is crucial in safety and operational settings, as it provides confirmation of the breaker’s position, which is essential for various control and automation tasks. This characteristic distinguishes A contacts from other types of contacts that may indicate different states or provide alternative functions.