What this MCCB is and what it does
The Siemens SENTRON 3VA1150-6GD42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 50 A continuous current at 40 °C, with a TM210 thermal-magnetic release designed for line protection — meaning it handles overloads and short-circuits in distribution panels without communication or ground-fault monitoring built in. The TM210 release gives a fixed thermal pickup and magnetic trip curve suited for cable and busbar protection in commercial and industrial switchboards — not for motor starting duty where adjustable overloads are needed.
Thermal derating and panel integration
The 50 A rating holds flat from 40 °C to 50 °C ambient, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. In a sealed enclosure with multiple breakers side-by-side, expect to apply the 70 °C column if internal panel temperature climbs — that's a 10 % reduction from the nameplate. Dimensions are 130 mm height, 101.6 mm width, 70 mm depth — a 4-pole MCCB that fits standard Siemens SENTRON mounting bases and busbar systems. Maximum power loss is 14.6 W — negligible for thermal budgeting in a single breaker, but add it up across a multi-breaker panel to avoid exceeding the enclosure's dissipation rating.