The purpose of ____ is to check the ability of the circuit breaker to withstand the overvoltages at power frequency as well as undesired value of voltage during lightning and other discharge phenomenon.

• A. routine test
• B. synthetic test
• C. short circuit test
• D. dielectric test

Answer: (D)

Die-electric test on Circuit breaker:
These tests are performed to check power frequency and impulse voltage withstand capacity.
Power frequency tests are kept on a new circuit breaker, the test voltage changes with a circuit breaker rated voltage.
In impulse tests, impulse voltage of particular value is employed to the breaker.