SENTRON 3VA4150-5ED34-0AA0 — 50 A MCCB, 85 kA at 240 V
The Siemens SENTRON 3VA4150-5ED34-0AA0 is a 3-pole molded-case circuit breaker carrying a 50 A frame rated at 40 °C ambient, with an interrupting capacity of 85 kA at 240 V AC and 35 kA at 480 V AC. That 85 kA figure at 240 V means it can safely clear a bolted fault on a low-voltage distribution bus without the arc flashing over to adjacent gear — a critical spec for high-fault service-entrance panels or sub-distribution boards where the utility transformer is close. The TM210 thermal-magnetic release handles overloads and short-circuits in one compact package, no auxiliary power needed.
Thermal derating and real-world current
Rated 50 A at 40 °C, but the current you can carry drops as the panel warms: 49 A at 45 °C, 47 A at 50 °C, 46 A at 55 °C, 44 A at 60 °C, 43 A at 65 °C, and 41 A at 70 °C. If this breaker sits in a crowded enclosure near other heat sources, plan for the 41 A floor at 70 °C — that is the real continuous current limit, not the 50 A label. The maximum power loss is 9.7 W, which drives the internal temperature rise inside the enclosure.
Dimensions and panel fit
Width 76.2 mm, height 129.4 mm, depth 75.1 mm — a standard 3-pole MCCB footprint for DIN-rail or panel-mount. Front IP40 protection keeps dust out of the mechanism; the -25 °C to 70 °C operating range covers most indoor electrical rooms.