BZ6WDL10CU is a field-installable dual-pole DPDT auxiliary switch designed for Fuji Electric molded case circuit breakers (MCCB) in the 50A to 225A frame range. This switch provides dual-pole double-throw (DPDT) functionality with left-side lead wire connection, enabling status monitoring and control signaling when the breaker trips or changes state. The switch is compatible with breaker types SA52/53RCUL, EA102/103CUL, SG53RCUL, and EG102/103CUL, and can be installed in the field without factory modification. It operates across the full frequency range of 50/60 Hz and integrates seamlessly with standard terminal block configurations. This accessory is commonly used in industrial control panels and power distribution systems where remote indication of breaker status is required.