Eaton NP7801C30H41 STH66LSIG Digitrip RMS Trip Unit

The Eaton NP7801C30H41 STH66LSIG Digitrip RMS Trip Unit is a digital protection device in Eaton's Cutler-Hammer lineup that provides RMS-current-based trip logic for compatible protection equipment. It monitors RMS current—the effective value of alternating current—to determine when to open the connected breaker and protect electrical circuits from overloads or faults. The NP7801C30H41 and STH66LSIG identifiers specify this exact variant within the Digitrip RMS family. Designed for integration with Eaton protection systems, this trip unit delivers the protective logic used by the host breaker to coordinate interruption across a distribution network. As part of the Digitrip RMS line, it functions as the electronic trip interface within a protection system.