What this MCCB is and what it does
The Siemens SENTRON 3VA1150-5ED22-0AA0 is a 2-pole molded case circuit breaker (MCCB) rated 50 A continuous, designed for line protection in distribution panels. It carries a TM210 thermal-magnetic overcurrent release — the thermal element handles overloads, the magnetic element clears short-circuits. The interrupting capacity is the headline number here: 187 kA at 240 V AC and 121 kA at 415 V AC, which means it can safely break fault currents up to those levels without welding contacts or cascading failure upstream. That kind of SCCR headroom makes it a fit for high-fault industrial services where a standard MCB would vaporize.
Thermal derating and operating range
The 50 A rating holds flat from 40 °C through 50 °C ambient. Above that it starts to step down: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If your panel runs hot — say a packed enclosure near a furnace line — you need to account for that derating curve rather than assuming full 50 A. The operating temperature range is -25 °C to +70 °C, with storage from -40 °C to +80 °C. Front IP40 means it's protected against tools and wires >1 mm, but not against water ingress; keep it inside a rated enclosure.
Dimensions and panel fit
The breaker measures 70 mm deep, 50.8 mm wide (2 inches), and 130 mm high. That 2-pole width is standard for a 50 A MCCB — it fits a typical DIN-rail or panel-mount footprint without surprises. The 70 mm depth means it clears most shallow enclosures, but check your gland plate clearance if you're retrofitting into a tight box. No undervoltage release, no ground-fault monitoring, no communication function on this variant — it's a straight thermal-magnetic line-protection device.