
250 Shipboard Electrical Power Systems
10.4.2 CirCUit breaker seleCtion
The circuit breaker has several ratings, such as
• A rated continuous current that it carries within an allowable temperature rise,
• A rated line voltage that it supports with adequate insulation to the ground,
• A symmetrical short circuit MVA or fault current that it can interrupt with-
out thermal damage,
• An interrupting (tripping) time, which is typically between 5 and 15 cycles,
and can be adjusted for coordination with other downstream and upstream
circuit breakers,
• A switching overvoltage withstand capability without restriking the con-
tacts after tripping,
• ...