What this MCCB carries
The Siemens SENTRON 3VA1150-3EF36-0JC0 is a 3-pole molded case circuit breaker rated 50 A at 40 °C, designed for line protection. Its interrupting capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V — so the same breaker covers 400 V-class distribution panels and 690 V industrial feeds without a frame-size jump. The 50 A thermal rating holds flat from 40 °C through 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. That means a panel at 60 °C still carries 48 A continuous — enough for a 45 A motor feeder or a 50 A bus tap that sees ambient rise inside a sealed enclosure.
Integration and auxiliary fit
The breaker ships with a shunt trip (STL) release and two HQ auxiliary switches installed — no separate ordering or field-fit of those accessories. The shunt trip lets a remote safety relay or E-stop chain drop the breaker without pulling the handle. The two HQ aux contacts report open/closed status back to a PLC or status lamp. Footprint is 130 mm high, 76.2 mm wide, 70 mm deep. The 70 mm depth matters for shallow backpanels or gland-plate clearance — it fits the same cutout as other 3VA1 frames, so a panel built for a 3VA1110-5ED36-0AC0 accepts this unit without enclosure modifications.
Lifecycle and sourcing posture
Rated insulation voltage is 800 V, and maximum power loss is 14.6 W. The operating temperature range runs from -25 °C to 70 °C, with storage from -40 °C to 80 °C. The 800 V insulation rating means it can sit on a 690 V bus with full margin to the 1 kV dielectric test.