The Siemens JMKT400MS3 Trip Unit is a mining-rated electronic trip unit intended for use with 400 A, 3-pole Siemens circuit-breaker assemblies. It lists a 400 A frame and a 400 A trip setting, providing overcurrent protection for three-phase mining circuits. This model is documented in Siemens and distributor catalogs as JMKT400MS3, confirming its role as the mining-trip unit variant for the 400 A JMKT family.
