SENTRON 3VA1050-3ED32-0BC0 — 50 A MCCB for Line Protection
The Siemens SENTRON 3VA1050-3ED32-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated 50 A and designed for line protection — covering feeder circuits, main distribution panels, and branch protection in commercial and industrial switchgear. Rated 50 A continuously from 40 °C up to 50 °C ambient, derating to 45 A at 70 °C. Breaking capacity reaches 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — enough for high-fault utility feeds without cascading upstream breakers. The 800 V rated insulation voltage gives headroom for 690 V line-to-line systems, where the interrupting rating holds at 7.5 kA.
Panel Fit and Mounting
Footprint is 76.2 mm wide (3 in), 130 mm tall, and 70 mm deep — fits standard Siemens 3VA panel cutouts and busbar systems without adapter plates. Comes with an undervoltage release (UVR) and 2 auxiliary switches (HQ design) pre-installed, so no separate accessory wiring for remote trip indication or undervoltage protection. Max power dissipation is 17.1 W — account for that heat load when spacing breakers in a sealed enclosure.