Model CP-5 is an under current monitor designed to monitor one leg of a three phase system. It is commonly used as a tower monitor on center pivot irrigation systems to detect a stalled center pivot.

The CP-5 has both an adjustable trip level and an adjustable trip delay timer. When the current is sensed, the Model CP-5 activates its output relay, thus starting the motor/pump. When the current in the monitored power line falls below the user-selectable trip point, the output relay then goes through the trip delay timer before finally deactivating the relay.