Class 2 (2nd Engineer) MET 📅 Jul 2025

Exam Question

(a) Describe the circuit breaker for an a.c. generator using a sketch to show how arcing is controlled.

(b) Explain the sequence of events that might occur if the breaker opens on a short circuit and state the check you would required following such event.

Reference Answer

(a) Description of circuit breaker:
The circuit breaker used for an A.C. generator is typically an Air Break Circuit Breaker . It is frame-mounted and of the draw-out type, allowing it to be isolated from the busbar and alternator input contacts by moving it horizontally. An interlock ensures the breaker is turned off before being drawn out.
Main Components :
Contacts : High-conductivity, silver-coated copper contacts ensure efficient current flow.

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