Which of the following circuit breakers has the highest dielectri

Which of the following circuit breakers has the highest dielectri
| Which of the following circuit breakers has the highest dielectric strength?

A. Minimum oil circuit breakers

B. Vacuum circuit breakers

C. Air blast circuit breakers

D. Bulk oil circuit breakers

Please scroll down to see the correct answer and solution guide.

Right Answer is: B

SOLUTION

Vacuum circuit breakers has the highest dielectric strength. The dielectric strength of vacuum is eight times greater than that of air and four times greater than that of SF6 gas. This high dielectric strength makes it possible to quench a vacuum arc within very small contact gap.