SENTRON 3VA1150-4EF32-0HA0 — 50 A MCCB with Shunt Trip, Line Protection
The Siemens 3VA1150-4EF32-0HA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels and industrial switchgear. It carries 50 A continuously at 40 °C, derating to 45 A at 70 °C, so the thermal curve stays predictable across a warm enclosure — no need to oversize for a crowded panel. Breaking capacity hits 121 kA at 240 V and 75.6 kA at 415 V, which means it handles high-fault scenarios downstream of a large transformer without cascading upstream. The 3-pole format with a shunt trip (STL) auxiliary release lets you remotely trip the breaker via a control signal — useful for emergency-stop circuits or supervisory shutdown.
Panel Fit and Mounting
At 76.2 mm wide and 70 mm deep, this MCCB fits a standard 3-pole footprint on a DIN rail or panel-mount base. The 130 mm height leaves room for cable glands and auxiliary contact blocks above the breaker. Spring-cage or screw terminals accept 0.2–2.5 mm² conductors — strip length 8 mm for the cage version.