The CSP also has an internal secondary breaker, which is intended to disconnect the ______________ in the event of an overload or short circuit on the secondary side

• A. Primary winding
• B. Secondary winding
• C. Hot legs
• D. Ground

Answer: (C)

The main idea is that an internal secondary breaker is placed to interrupt the current on the side that actually feeds the load—the hot conductors on the secondary. When overload or a short occurs on the secondary, opening the hot legs quickly stops all current to the downstream equipment, protecting both the transformer and the connected circuit. Disconnecting the primary winding would cut power at the source rather than stop fault current on the secondary; removing the secondary winding would remove the voltage source entirely rather than isolate the load; grounding does not interrupt the live current path to the load. So the hot legs on the secondary are the right target for this protective action.