Line protection MCCB with 187 kA interrupting capacity
That means the 50 A continuous rating is baked in; if the load grows past 50 A, swap the breaker, not the trip unit. The thermal curve tracks the 50 A mark flat from 40 °C through 50 °C, then derates to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. In a sealed panel with poor airflow, that derating is the number that governs, not the nameplate 50 A. The auxiliary contact block ships as 2 HQ (high-quality) switches — these are rated for electronic loads, not just pilot-duty relay coils. The shunt trip (STL) release is built in, so a remote trip signal from an E-stop or fire-alarm relay lands on the breaker without an external contactor.
Panel fit and wiring constraints
The integrated auxiliary trip is order code 3VA9688-0BL32 — the factory-fitted shunt trip coil. The auxiliary switches are form-C contacts rated for electronic loads.