Electrical Engineering · 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 measures the impedance in the circuit and trips when it exceeds a certain limit.
- 2It operates based on the difference in voltage across the protected equipment.
- 3It operates based on the phase angle difference between currents.
- 4It measures the heat generated due to current flow and operates when a preset temperature is reached.✓
Correct answer
It measures the heat generated due to current flow and operates when a preset temperature is reached.
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