Magnetic overload relays react only to current excess and are not affected by which factor?

Magnetic overload relays react only to current excess and are not affected by which factor?

• A. Humidity
• B. Temperature
• C. Vibration
• D. Noise

Answer: (B)

Magnetic overload relays trip based on the magnetic force created by excess current, not on heat. Since their sensing element responds to the current’s magnitude through an electromagnetic mechanism rather than a temperature-based sensor, ambient temperature doesn’t change the trip threshold or action. That’s why temperature isn’t a factor affecting their response to overload. Humidity, vibration, and noise can influence other aspects of a relay’s performance or reliability, but the fundamental current-triggered operation of a magnetic overload relay remains independent of temperature.

Magnetic overload relays trip based on the magnetic force created by excess current, not on heat. Since their sensing element responds to the current’s magnitude through an electromagnetic mechanism rather than a temperature-based sensor, ambient temperature doesn’t change the trip threshold or action. That’s why temperature isn’t a factor affecting their response to overload. Humidity, vibration, and noise can influence other aspects of a relay’s performance or reliability, but the fundamental current-triggered operation of a magnetic overload relay remains independent of temperature.