What provides overcurrent protection for the secondary leads in a CSP transformer?

The correct answer is a low voltage circuit breaker, which serves as an effective means of overcurrent protection for the secondary leads in a CSP (Capacitor Start-Run) transformer.

A low voltage circuit breaker is designed to automatically shut off the electrical flow in the event of an overload condition, which is characterized by excessive current that could damage the transformer or connected devices. This interruption helps prevent overheating and reduces the risk of fire or equipment failure. Circuit breakers can be reset after tripping and provide reliable protection while maintaining the ability to restore power when needed.

Other options such as a fuse link, while also providing overcurrent protection, operates differently. A fuse must be replaced after it blows, which may not be as convenient as resetting a circuit breaker. Grounding switches are meant for safety and grounding purposes rather than serving as overcurrent protection. Insulation resistance testers check the quality of insulation and do not contribute to circuit protection from overcurrent.