What this MCCB is and what it does
The Siemens SENTRON 3VA1050-4ED36-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous at 40 °C, with a TM210 thermal-magnetic release — meaning the thermal element handles overloads and the magnetic element handles short-circuits, no electronic trip unit to program. It's designed for line protection, so it sits at the feeder or branch circuit, not on a motor or generator. Breaking capacity is the number that decides whether this breaker holds or blows upstream: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA at 240 V is a high-interrupting rating — it clears a fault without the arc re-striking, which matters when the available fault current at the panel is north of 65 kA. Rated insulation voltage is 800 V, so the internal clearances and creepage are sized for 690 V systems with margin. Power loss maxes at 14.6 W — negligible for thermal budgeting inside a steel enclosure, but worth noting if you're packing breakers tight.
Physical fit and panel integration
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep. That 76.2 mm width is a standard 3-pole MCCB footprint — fits most DIN-rail or panel-mount bases without re-drilling. Depth of 70 mm means it clears a 100 mm deep enclosure with room for wiring gutters. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. The current derating curve starts at 55 °C (49 A) and drops to 45 A at 70 °C — if the panel ambient runs hot, size the breaker one frame up or account for the derate.
What the TM210 release means for coordination
The TM210 is a fixed thermal-magnetic release — no interchangeable rating plugs, no electronic adjustments. Thermal pickup is fixed at the 50 A frame rating; magnetic pickup is fixed at 10x In (500 A typical for TM releases). That makes selectivity with downstream breakers predictable: you coordinate on the time-current curve without worrying about someone dialing the trip settings. No undervoltage release, no ground-fault monitoring, no communication function, no trip indicator. This is a bare line-protection breaker — if you need shunt trip, UVR, or remote signaling, you add auxiliary switches (the design accepts up to 3 auxiliary switches HQ).