What this MCCB carries — and what it means on the line
The Siemens SENTRON 3VA1050-4ED42-0DC0 is a 4-pole molded case circuit breaker rated for 50 A continuous current, with a TM210 thermal-magnetic overcurrent release. Breaking capacity hits 121 kA at 240 V, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V — numbers that tell you this unit handles high-fault utility feeds or transformer secondaries without cascading upstream. Rated insulation voltage is 800 V, so it lives comfortably in 480/277 V or 600 V panels. Current rating holds flat at 50 A from 40 °C through 50 °C ambient, then derates to 48 A at 55 °C and 45 A at 70 °C. That means in a hot enclosure — say a non-ventilated panel near a furnace line — you don't lose headroom until past 50 °C, which is better than many MCCBs that start derating at 40 °C. It ships with an undervoltage release (UVR) fitted and two high-quality auxiliary switches as standard. No communication module, no ground-fault monitoring, no N-conductor protection — this is a clean line-protection breaker, not a multifunction power monitor.
Panel fit and mounting
Dimensions are 101.6 mm wide by 130 mm tall by 70 mm deep — a 4-pole MCCB that fits the standard SENTRON mounting footprint. Front IP40 protection means it's fine inside a closed panel but not for washdown environments. No trip indicator on the front face, so fault diagnostics rely on the auxiliary switch feedback or a visual check of the handle position.