Refrigeration & Air Conditioning Mechanic Red Seal · Question
What is the primary safety function of an overload relay in a motor control circuit?
An overload relay is designed to protect a motor from damage due to sustained overcurrents, which can result from mechanical overloads, low supply voltage, or a
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Question: What is the primary safety function of an overload relay in a motor control circuit?
Answer options:
- To prevent reverse rotation of the motor. ✅ To protect the motor from sustained overcurrent conditions.
- To ensure proper phase sequencing for three-phase motors.
- To provide a means of manual motor start/stop control.
Correct answer: To protect the motor from sustained overcurrent conditions.
Explanation: An overload relay is designed to protect a motor from damage due to sustained overcurrents, which can result from mechanical overloads, low supply voltage, or a single-phasing condition. It typically uses bimetallic strips or electronic sensing to trip and open the control circuit.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
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