Siemens S03JLD6 U Three-Phase Circuit Breaker

Siemens S03JLD6-U is a three-pole shunt-trip accessory designed for LD-Series molded-case circuit breakers rated up to 600 V. This remote-trip device provides an external control path to trip the associated LD/LDB frame breaker in three-phase installations, enabling fast, safe shutdown in emergencies or safety interlock schemes. The S03JLD6-U variant is part of Siemens’ S03JLD6 shunt-trip family, built to integrate with standard LD/LDB frame breakers without altering the primary switching mechanism. When paired with compatible 3P LD/LDB molded-case breakers, it preserves the system’s 600 V rating and supports standard three-pole configurations used in industrial power distribution. Typical use cases include machine safety circuits, emergency-stop interlocks, and industrial control panels where remote disconnection is required for safety compliance. Installation and wiring should follow Siemens installation instructions and local electrical codes, and the accessory must be used with an appropriate compatible main breaker.