Electrician Red Seal · Question
Why are fuses or circuit breakers used in conjunction with motor overloads for motor protection in industrial applications?
Fuses or circuit breakers are primarily for short-circuit and ground fault protection, interrupting very high currents quickly. Overload relays are designed to
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Question: Why are fuses or circuit breakers used in conjunction with motor overloads for motor protection in industrial applications?
Answer options:
- Fuses protect against overheating; overloads protect against short circuits. ✅ Fuses protect against short circuits; overloads protect against sustained overcurrent.
- Both provide protection against locked rotor current.
- Both protect against voltage fluctuations.
Correct answer: Fuses protect against short circuits; overloads protect against sustained overcurrent.
Explanation: Fuses or circuit breakers are primarily for short-circuit and ground fault protection, interrupting very high currents quickly. Overload relays are designed to protect the motor from sustained overcurrents that could lead to overheating and winding damage, but not necessarily from very high short-circuit currents.
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