SENTRON 3VA1150-6GF46-0AA0 — 50 A MCCB for Line Protection
The Siemens SENTRON 3VA1150-6GF46-0AA0 is a 4-pole molded case circuit breaker rated at 50 A continuous, designed specifically for line protection in distribution panels and industrial switchgear. It carries a TM240 thermal-magnetic overcurrent release — meaning the thermal element is fixed at 50 A with a magnetic trip threshold of 240 A, giving you a clear coordination curve for feeder circuits. The 220 kA breaking capacity at 240 V AC handles high-fault scenarios typical of transformer-fed main distribution, while the 17 kA rating at 690 V covers industrial loads on 600 V class systems. The rated insulation voltage of 800 V provides headroom for 690 V networks without derating the dielectric withstand.
Breaking Capacity and Temperature Derating — What the Ratings Mean for Your Panel
The 220 kA at 240 V is the highest interrupting rating on this breaker, typical for the main breaker position in a 240 V delta or 208Y/120 V panel where available fault current can exceed 100 kA. At 415 V it's 154 kA, and at 440 V it's 121 kA — these cover European and Asian 400 V class networks. The drop to 17 kA at 500 V and 690 V is expected for a 50 A frame; above 480 V the arc extinction becomes more demanding, so the breaker is still usable on 600 V class systems but you need to verify the available fault current at the point of common coupling stays under 17 kA. Temperature derating is minimal up to 50 °C — the breaker holds 50 A. At 55 °C it drops to 49 A, at 60 °C to 48 A, at 65 °C to 46 A, and at 70 °C to 45 A. If the panel ambient runs above 50 °C, size the continuous load at 45 A to stay within the 70 °C limit. The operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C — fine for unheated warehouses in cold climates.
Dimensions and Panel Integration
The 3VA1150-6GF46-0AA0 measures 70 mm deep, 101.6 mm wide, and 130 mm tall. The 101.6 mm width (4 inches) is standard for a 4-pole MCCB in the SENTRON 3VA frame — it occupies four 25 mm (1-inch) pole positions on a DIN rail or panel-mount backplate. The 70 mm depth means it fits within a 200 mm deep enclosure with room for rear-mounted busbars. Maximum power loss is 14.6 W, which is modest for a 50 A breaker; no forced ventilation required in a typical IP40 enclosure. Front protection is IP40 — suitable for dry indoor panels. No trip indicator and no undervoltage release are fitted on this variant; if you need those, look at the 3VA11 options with the 'A' suffix for auxiliary switches or the 'U' suffix for undervoltage releases.