MCCB for line protection — 50 A, 220 kA at 240 V
The Siemens SENTRON 3VA1150-6EF32-0HH0 is a 3-pole molded case circuit breaker designed for line protection. It carries a full-load current rating of 50 A up to 40 °C ambient (derated to 45 A at 70 °C), and its interrupting capacity hits 220 kA at 240 VAC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream. Insulation voltage is rated 800 V, so it can sit on 480 V or 600 V panels with margin.
Interrupting ratings across voltages
Breaking capacity drops as voltage climbs: 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. That 17 kA at 690 V is still solid for most industrial motor branch circuits; the 220 kA at 240 V is what you need for high-available-fault service entrances.
Built-in auxiliary and shunt trip
This MCCB ships with 2 auxiliary switches plus a trip alarm switch (HQ), and a shunt trip (STL) release for remote opening. No undervoltage release, no ground-fault monitoring, no communication module — it's a straightforward line-protection breaker with remote-trip and status feedback. The auxiliary switch configuration matches the standard 3VA accessory slot, so swapping in a different aux block later is a clip-in change.
Panel fit and environmental range
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep — standard 3VA frame size that clips onto DIN rail or mounts directly to a backplate. Operating temperature range -25 °C to 70 °C; storage from -40 °C to 80 °C. Maximum power dissipation is 14.6 W, so factor that into enclosure thermal calculations if you're packing several breakers in a sealed cabinet.