The Siemens 3VA1150-4EF36-0DC0 is a 3-pole molded case circuit breaker from the SENTRON series, rated 50 A at 40 °C and delivering a breaking capacity of 75.6 kA at 415 V AC — enough to handle high-fault utility feeds in industrial distribution panels.
Breaking capacity and current ratings
Breaking capacity varies with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V — the 415 V figure is the one most commonly specified for European 400 V distribution. Continuous current rating holds at 50 A from 40 °C through 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C — the thermal limit in a warm cabinet matters if the breaker is enclosed without forced cooling.
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that fits most Siemens SENTRON mounting bases and panel cutouts.