Practice question

What is the function of a circuit breaker in a traffic signal cabinet?

  1. To boost the voltage to signal heads
  2. To protect circuits from overcurrent conditions by automatically opening the circuit
  3. To convert AC power to DC for the controller
  4. To regulate the timing of signal phases

Answer: B — To protect circuits from overcurrent conditions by automatically opening the circuit

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Practice more: IMSA Traffic Signal I Practice Questions - IMSA Traffic Signal Technician Level I Certification Exam Exam →