Siemens 3VA4150-4ED24-0AA0 — 2-pole MCCB, 50 A, 65 kA interrupting capacity
The Siemens 3VA4150-4ED24-0AA0 is a 2-pole molded-case circuit breaker from the SENTRON family, designated as system protection. It carries a continuous current rating of 50 A at 40 °C, with a thermal-magnetic TM210 release that provides adjustable thermal overload and fixed magnetic short-circuit protection (the instantaneous trip is fixed at 500 A). The interrupting capacity is 65 kA at 240 V and 25 kA at 480 V — that 65 kA figure means it can safely clear a fault current up to 65,000 A at 240 V without rupturing, which is typical for a high-rupturing-capacity MCCB in a main or branch distribution panel.
Thermal derating and ambient limits
The 50 A rating is at 40 °C ambient. Above that, the breaker derates linearly: 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. The operating ambient range is -25 °C to +70 °C, with storage from -40 °C to +80 °C. If your panel runs hot — say, a crowded enclosure near a furnace line — use the 70 °C figure (41 A) for sizing, not the catalog 50 A.
Physical fit and panel integration
Dimensions: 75.1 mm deep, 50.8 mm wide, 129.4 mm high. The 50.8 mm width is a standard 2-inch footprint for a 2-pole MCCB — it fits a typical DIN-rail or panel-mount cutout without surprises. Front-face protection is IP40, so it's suitable for a dry indoor enclosure but not washdown areas.
Approvals and compliance
The product carries a UL file designation SEAB, indicating UL 489 listing for molded-case circuit breakers. The reference code per IEC 81346-2 is Q, and the design follows IEC/UL standards. No communication function, no ground-fault monitoring, and no motor drive option on this version — it's a straight thermal-magnetic breaker for basic overcurrent protection.