What this MCCB is and what it's rated for
The SENTRON 3VA1150-4EF32-0JH0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection — meaning it sits upstream protecting a feeder or distribution bus, not a specific motor or load. It's rated 50 A continuously at 40 °C (derating to 45 A at 70 °C), with an insulation voltage of 800 V. Interrupting capacity is the headline number here: 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. That's enough to handle high-fault utility feeds or transformer secondaries — the 121 kA figure at 240 V covers most North American panelboard applications, while the 75.6 kA at 415 V suits European industrial distribution.
Auxiliary configuration and panel fit
This variant ships with a shunt trip release (STL) and two auxiliary switches plus one trip alarm switch (HQ configuration). That means it can be remotely tripped via a control signal, and the auxiliary contacts report breaker position and fault status back to a PLC or annunciator — useful in automated distribution panels where you need remote indication. Physical footprint: 76.2 mm wide (3 in), 130 mm tall, 70 mm deep. That's a standard 3-pole MCCB width for the 3VA frame size — it'll fit existing SENTRON 3VA panel cutouts and busbar arrangements without re-drilling. Power loss is 14.6 W maximum at rated current — relevant for thermal management inside a sealed enclosure. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.