An overload relay may be used to protect a motor and its related circuits from accidental or prolonged overloads.

An overload relay may be used to protect a motor and its related circuits from accidental or prolonged overloads.

• A. True
• B. False
• C. Only for single-phase motors
• D. Only in combination with fuses

Answer: (A)

Overload protection for motors relies on an overload relay that monitors current (and, in thermal types, the heat generated by that current) and trips the circuit if the motor runs above its rated current for a set period. This prevents the windings from overheating during sustained overloads or stall, protecting the motor and related circuitry. The relay is typically integrated with a motor starter (contactor) so that a trip opens the circuit and stops power to the motor. It can protect motors of different configurations, not just single-phase, and while it may be used alongside fuses or circuit breakers, the overload relay itself provides the specific protection against prolonged overload conditions designed to minimize damage from overheating.

Overload protection for motors relies on an overload relay that monitors current (and, in thermal types, the heat generated by that current) and trips the circuit if the motor runs above its rated current for a set period. This prevents the windings from overheating during sustained overloads or stall, protecting the motor and related circuitry. The relay is typically integrated with a motor starter (contactor) so that a trip opens the circuit and stops power to the motor. It can protect motors of different configurations, not just single-phase, and while it may be used alongside fuses or circuit breakers, the overload relay itself provides the specific protection against prolonged overload conditions designed to minimize damage from overheating.