Physics · Electrical Protection Systems
What is the primary operating principle of a thermal relay in an electrical protection system?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1It operates based on the difference in voltage across the protected equipment.
- 2It measures the amount of heat generated due to the current flow and operates when a preset temperature is reached.✓
- 3It measures the impedance in the circuit and trips when it exceeds a certain limit.
- 4It operates based on the phase angle difference between the currents.
Correct answer
It measures the amount of heat generated due to the current flow and operates when a preset temperature is reached.
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