Part identity and key ratings
The Siemens 3VM1150-4ED12-0AA0 is a SENTRON 1-pole molded case circuit breaker (MCCB) designed for line protection, fitted with a TM210 thermal-magnetic release. Its 50 A continuous rating holds across 40 °C to 50 °C ambient, then derates to 45 A at 70 °C — so if your panel runs hot near the top of the enclosure, you lose 5 A of headroom. Breaking capacity is 76 kA at 240 VAC and 9 kA at 415 VAC — sufficient for most North American 240 V distribution panels; the 415 V figure tells you it clears faults on 400 V-class systems but you need to verify SCCR coordination with the upstream transformer.
Lifecycle and sourcing posture
This part is listed as current production. It is sourced to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
Panel integration and footprint
Width is 25.4 mm (1 inch) — a standard 1-pole MCCB slot. Depth of 70 mm (2.76 in) and height of 130 mm (5.12 in).
Trip unit and protection design
The TM210 release is a fixed thermal-magnetic type — no interchangeable rating plugs, no ground-fault module, no voltage-trip coil. It is a straight line-protection breaker for resistive or lightly inductive loads. Maximum power loss is 5 W, which is modest for a 50 A frame.