What this MCCB does — and where the numbers matter
The Siemens SENTRON 3VA1150-6EF36-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for line-protection duty. It carries 50 A continuously at 40 °C and holds that rating all the way up to 50 °C — at 55 °C it derates to 49 A, at 70 °C it's still good for 45 A. That's a solid thermal curve for a warm panel or a crowded enclosure. Breaking capacity is where this unit earns its keep: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 690 V. Those numbers tell you it's built for high-fault installations — think transformer secondaries, busway feeds, or main disconnects where the available short-circuit current is serious. The 800 V rated insulation voltage backs up the high-side placement. It ships with a shunt trip (STL) and a 2-auxiliary-switch-plus-1-trip-alarm-switch HQ block. That means remote tripping and status feedback are wired in from the factory — no extra add-on modules to buy and fit. The trip indicator and voltage trigger are standard. No undervoltage release, no ground-fault monitoring, no communication module on this variant. It's a straight line-protection breaker, sized for the main feed.
Integration and panel fit
Footprint is 70 mm deep by 76.2 mm wide by 130 mm tall — standard 3-pole MCCB envelope for a 50 A frame. It mounts on a DIN rail or directly to a backplate; the SENTRON family shares a common accessory ecosystem.