MCCB for line protection — 50 A, 3-pole, TM210 release
The Siemens 3VA1050-2ED36-0HA0 is a SENTRON molded case circuit breaker (MCCB) sized for 50 A rated continuous current (Iu) across a 3-pole configuration, carrying a TM210 thermal-magnetic overcurrent release. It is built for line protection — the standard role of guarding feeder and branch circuits against overload and short-circuit faults in a distribution panel. The 52.5 kA breaking capacity at 240 V (32 kA at 415 V, 13.6 kA at 440 V, 7.5 kA at 690 V) gives it the interrupting muscle for high-fault-current industrial mains, not just light commercial service. Rated insulation voltage is 800 V, so it can sit on 690 V line-to-line systems with headroom. The TM210 release is a fixed thermal-magnetic type — no interchangeable rating plugs, no electronic adjustment — which keeps the BOM simple and the coordination predictable for a panel builder.
Thermal derating and ambient temperature
The 50 A rating holds flat from 40 °C through 50 °C. Above that, the TM210 release begins to thermally derate: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, 45 A at 70 °C. If the panel ambient runs hot — say, a packed enclosure near a furnace line or a solar combiner box in full sun — factor that 45 A ceiling at 70 °C into the load calculation. The breaker itself can operate from -25 °C to 70 °C and store from -40 °C to 80 °C.
Shunt trip and auxiliary release
This variant includes a shunt trip (STL) — a voltage-triggered release that lets a remote signal (emergency stop, PLC output, pressure switch) open the breaker independently of the overcurrent trip. The integrated auxiliary trip accessory is order code 3VA9688-0BL30. There is no undervoltage release, no auxiliary contact, no ground-fault monitoring, and no communication module on this version. If you need remote status feedback or undervoltage protection, you are looking at a different 3VA variant.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. That is a standard 3-pole MCCB footprint for a 50 A frame — mounts on a DIN rail or directly to a backplate via screw terminals. IP40 on the front (finger-safe), open frame behind. The width is the critical dimension for multi-breaker row spacing in a distribution board; 76.2 mm per pole translates to about 3 inches per breaker in a row.