Electrical Engineering · Switchgear and Protection
A 400 A MCCB is protecting a feeder with a prospective short-circuit current of 45 kA. If the MCCB's rated breaking capacity is 35 kA, then:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The MCCB will trip normally and clear the fault without any damage.
- 2The MCCB will safely act like a fuse and isolate the circuit.
- 3The MCCB will automatically limit the fault current to 35 kA.
- 4The MCCB may fail mechanically or explode during a short-circuit fault.✓
Correct answer
The MCCB may fail mechanically or explode during a short-circuit fault.
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