What this MCCB delivers for your panel
The Siemens SENTRON 3VA1150-5EF32-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous at 40 °C, with an interrupting capacity of 187 kA at 240 V AC — enough to handle high-fault scenarios on a 240 V line without cascading upstream. At 415 V it still clears 121 kA, and at 440 V it holds 75.6 kA, so it fits distribution panels where fault current runs high. The line-protection design means it trips on overload and short-circuit, not on ground fault; the undervoltage release (UVR) lets you drop the breaker when control voltage falls below a set threshold — useful for emergency-stop circuits or undervoltage protection on motor feeders.
Mounting and integration
The 3VA1150-5EF32-0DH0 mounts on a DIN rail or panel-mount base — the 76.2 mm width (3 in) and 130 mm height (5.12 in) fit standard SENTRON enclosure cutouts. Depth is 70 mm (2.76 in), so it clears shallow backboxes. The auxiliary switch block comes pre-configured with 2 auxiliary switches plus 1 trip alarm switch (HQ design), giving you status feedback to a PLC or HMI without extra wiring. The undervoltage release (UVR) is factory-fitted; no field kit needed.
Thermal derating and operating range
This MCCB holds its full 50 A rating from 40 °C through 50 °C. At 55 °C it derates to 49 A, at 60 °C to 48 A, at 65 °C to 46 A, and at 70 °C to 45 A. The operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 17.1 W — factor that into enclosure ventilation if you're packing several breakers in a sealed cabinet.