What this MCCB is and what it does
The Siemens SENTRON 3VA1050-2ED36-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous current and built for line protection — meaning it guards feeders and distribution circuits against overloads and short circuits, not motor protection where you'd want adjustable trip curves. It carries a TM210 thermal-magnetic fixed trip unit, so the thermal element handles sustained overloads and the magnetic element catches fast short-circuit faults. No voltage-trip or communication functions on this variant — it's a straight electromechanical breaker. Breaking capacity runs 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V. That 32 kA at 415 V is the figure most panel builders will size against for common low-voltage distribution — it gives solid SCCR headroom for a 50 A feeder.
Sizing and thermal derating
The breaker holds its full 50 A rating from 40 °C up through 50 °C. Above that it starts to taper: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If this lives in a hot panel — say near a drive or transformer — you'll want to account for that drop at the upper end. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems. Operating range is -25 °C to 70 °C; storage range -40 °C to 80 °C.
Panel fit and integration
Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — a standard 3-pole MCCB footprint that drops into most SENTRON panelboards and distribution blocks without surprises. The 76.2 mm width is three 25.4 mm pole spacings, which matches the usual DIN-rail or busbar pitch. Front protection is IP40, so it's fine inside a closed panel but not rated for washdown or outdoor exposure. No auxiliary contacts or ground-fault monitoring on this build — if you need those, you're looking at a different suffix. An undervoltage release (UVR) is included as standard — part number 3VA9608-0BB25 for the integrated auxiliary trip. That means the breaker will trip if control voltage drops, which is useful for safety circuits or coordinated shutdown sequences.
Lifecycle and sourcing reality
For a BOM line or panel build, this is a straightforward spec-in. The 50 A TM210 variant with UVR is a common configuration, so it's not a long-tail oddball that might get deprioritized. Sourced and quoted to order against an RFQ; availability and current pricing confirmed at quote time.