Electrical Engineering · Switchgear and Protection
How is the 3-phase short-circuit breaking capacity of a circuit breaker calculated?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Breaking capacity = Rated symmetrical breaking current × Rated service voltage × √3✓
- 2Breaking capacity = Rated symmetrical breaking current × Rated service voltage × √2
- 3Breaking capacity = Rated symmetrical breaking current × Rated service voltage
- 4Breaking capacity = Rated symmetrical breaking current × Rated service voltage × 2
Correct answer
Breaking capacity = Rated symmetrical breaking current × Rated service voltage × √3
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