Auxiliary contacts could be mounted on which of these components?

• A. Transformers
• B. Contactors
• C. Starters
• D. All of the above

Answer: (C)

Auxiliary contacts are devices that are used primarily to provide additional control or signaling functions in electrical systems. They are typically mounted on contactors and starters, where their primary role is to indicate the current state of the main contact points or to control other circuits based on that state.

In this context, contactors incorporate auxiliary contacts to provide feedback in control logic, allowing for functions such as interlocking and sequential control. Similarly, starters, especially motor starters, often include auxiliary contacts to manage the overall operation of the motor, ensuring it starts correctly, stops as needed, and provides feedback to control systems.

While transformers are critical components in electrical systems, they do not utilize auxiliary contacts in the same manner. Transformers are designed to step voltages up or down and do not require additional control functions that auxiliary contacts provide.

By understanding that auxiliary contacts serve to support functions in contactors and starters, it becomes clear that the correct answer should encompass those components specifically designed for control functionalities. Thus, focusing on starters alone neglects the essential role of contactors, which competently accommodate auxiliary contacts to enhance system operation and safety.