What this MCCB carries — and what that means for your panel
The Siemens 3VA1112-6EF36-0JH0 is a SENTRON molded case circuit breaker rated for line protection, sized at 125 A continuous at 40 °C and holding that same 125 A all the way up to 50 °C — no derate needed in a warm enclosure until you cross 55 °C, where it drops to 122 A. Breaking capacity is the headline: 220 kA at 240 V, 154 kA at 415 V, and still 75.6 kA at 440 V. That puts this breaker into high-fault panels — think transformer secondaries or large motor control centers where the available fault current is well above what a standard 65 kA MCCB can handle. Three-pole construction, 70 mm deep by 76.2 mm wide by 130 mm tall, fits the standard SENTRON mounting footprint. Rated insulation voltage is 800 V.
Auxiliaries and releases — what ships on this variant
This order code comes factory-fitted with two auxiliary switches plus one trip alarm switch (HQ type), and a shunt trip release (STL). That means you get remote status indication and remote tripping capability without having to order add-on modules separately — useful for emergency-stop circuits or PLC-driven load shedding. No undervoltage release on this variant, and no ground-fault monitoring. If UVR or GF protection is required for your application, you will need a different order code within the 3VA1 family. Maximum power loss is 28.1 W, so ventilation in a sealed enclosure is advisable if multiple breakers are ganged together.