Electrician Red Seal · Question
A large industrial motor controlled by a reduced voltage starter (RVS) needs protection against prolonged overcurrent conditions. Which component is specifically designed for this purpose?
A thermal overload relay is specifically designed to protect motors from prolonged overcurrents that could lead to overheating and damage. It uses bimetallic st
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Question: A large industrial motor controlled by a reduced voltage starter (RVS) needs protection against prolonged overcurrent conditions. Which component is specifically designed for this purpose?
Answer options:
- Control fuse
- Magnetic overload relay ✅ Thermal overload relay
- Circuit breaker
Correct answer: Thermal overload relay
Explanation: A thermal overload relay is specifically designed to protect motors from prolonged overcurrents that could lead to overheating and damage. It uses bimetallic strips or eutectic alloys that heat up in proportion to motor current, eventually tripping if the overcurrent persists. Magnetic overloads provide instantaneous trip for high fault currents. Circuit breakers can provide both, but thermal overloads are precise for motor protection. Control fuses protect the control circuit, not the motor itself.
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