Fuses are sometimes placed in series with a thermal trip-type circuit breaker. What is the purpose of a fuse used in this arrangement?

Correct Answer: Option A — short-circuit protection

Title 46 CFR Subchapter J and IEEE 45 standards recognize that thermal-magnetic circuit breakers may lack adequate interrupting capacity for massive fault currents. Fuses placed in series provide high fault-clearing capability, protecting the system against catastrophic short-circuit currents exceeding the breaker rating.