Which of following relay belongs to instantaneous relay class

Electrical Engineering Multiple Choice Question on Power System Protection

Which of following belongs to instantaneous relay class:

  1. Induction type
  2. Permanent magnet moving coil type
  3. Shaded pole type
  4. Thermocouple type

Correct answer: 2. Permanent magnet moving coil type


The electrical relay is an electrical device that detects the electrical fault and initiates the operation of the circuit breaker to isolate the defective components from the power system.

Also see: 20 Different Types of Relays

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