Siemens SENTRON 3VA1150-3EF36-0HH0 — 50 A MCCB with shunt trip and auxiliary switches
The Siemens 3VA1150-3EF36-0HH0 is a 3-pole molded case circuit breaker in the SENTRON series, designed for line protection. It carries a continuous current rating of 50 A across the ambient range from 40 °C through 50 °C, then derates linearly to 45 A at 70 °C — per the datasheet, that full thermal curve is what governs the real panel loading, not just the 50 A label. Interrupting capacity is voltage-dependent: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. The rated insulation voltage is 800 V, so the breaker is suitable for 480/277 V and 600 V class panels where the available fault current stays within those published limits. This variant ships with a shunt trip release (STL) and a complement of 2 auxiliary switches plus 1 trip alarm switch (HQ). There is no undervoltage release, no ground-fault monitoring, and no communication module — it is a straightforward thermal-magnetic line-protection breaker with remote trip capability via the shunt release.
Integration and mounting
The breaker occupies a 3-pole footprint: 76.2 mm wide, 130 mm tall, 70 mm deep. Those dimensions match the standard SENTRON 3VA mounting pattern — it installs on a DIN rail or panel-mount adapter without requiring busbar re-spacing versus other 3VA frames of the same pole count. Maximum power dissipation is 14.6 W. In a sealed enclosure with multiple breakers ganged, that figure feeds the thermal rise calculation — derating the 50 A per the curve above 50 °C is the safe practice.