When a relay coil energizes, what happens to its contacts in a signaling circuit?

When a relay coil energizes, what happens to its contacts in a signaling circuit?

• A. They remain unchanged
• B. They open or close to switch signal paths and interlocking logic
• C. They heat up to disable circuit
• D. They physically rotate the cabinet

Answer: (B)

Activating the relay coil moves the magnetic core to change the position of the contact set. The contacts act as switches that control the signaling paths and interlocking logic. When energized, normally open contacts close to complete a circuit, and normally closed contacts open to break a circuit. This switching lets signals run or be held in the correct interlock state, enabling proper routing and safety. The coil energization doesn’t heat the circuit or rotate the cabinet; its purpose is to move the contacts to the opposite state.

Activating the relay coil moves the magnetic core to change the position of the contact set. The contacts act as switches that control the signaling paths and interlocking logic. When energized, normally open contacts close to complete a circuit, and normally closed contacts open to break a circuit. This switching lets signals run or be held in the correct interlock state, enabling proper routing and safety. The coil energization doesn’t heat the circuit or rotate the cabinet; its purpose is to move the contacts to the opposite state.