The Siemens SENTRON 3VA2225-6HN32-0KH0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, with a breaking capacity of 242 kA at 240 V AC. It's built for line protection and comes fitted with a shunt trip release (STL) plus two auxiliary switches and one trip alarm switch (HQ).
What the ratings mean for fit
The 250 A continuous rating holds flat from 40 °C up to 50 °C — no derating needed in a typical warm panel. At 55 °C it drops to 241 A, at 60 °C to 232 A, and at 70 °C to 213 A. If your enclosure runs hot, size up one frame or account for the thermal curve. Breaking capacity varies sharply with system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. That 4.5 kA at 690 V is the limiting case — verify your available fault current at that voltage before committing the BOM line. Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a 3-pole MCCB that fits standard SENTRON panel footprints. The 86 mm depth leaves room for rear-connected busbars in most distribution boards.
Integration notes
The breaker includes a shunt trip release (STL) for remote tripping and two auxiliary switches plus a trip alarm switch (HQ) for status feedback to a PLC or annunciator panel. No undervoltage release is fitted — if you need UVR, that's a different variant. No communication module onboard; this is a standalone line-protection device. Rated for operation from -25 °C to 70 °C ambient, storage from -40 °C to 80 °C. Maximum power loss is 48 W — account for that heat in a sealed enclosure.