Siemens 3VA2225-5HN42-0KL0 — 250 A SENTRON MCCB, Line Protection
The Siemens 3VA2225-5HN42-0KL0 is a 4-pole SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, sized for line protection duty in distribution panels. Its interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 500 V — numbers that govern selectivity and SCCR coordination downstream. The 250 A frame carries a 2 500 A maximum/minimum rating, meaning the breaker itself is the full-frame unit, not a smaller frame with a higher trip.
Breaking Capacity and Thermal Derating
The 187 kA at 240 V is the headline number, but the 121 kA at 415 V is what matters for most 400 V-class panels. At 500 V the capacity drops to 75.6 kA, and at 690 V it falls to 4.5 kA — that steep roll-off means this breaker is not a universal high-voltage device; it is optimized for low-voltage distribution up to 500 V. Thermal derating is flat up to 50 °C (250 A), then drops to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your panel ambient runs above 50 °C, you need to account for the loss.
Auxiliary Configuration and Internal Wiring
The breaker ships with a shunt trip (STL) release for remote tripping and a full auxiliary switch complement: 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch (HQ configuration). That means you get status feedback for open/closed, a separate trip-indication contact, and an electrical alarm contact — all factory-fitted, no field assembly. The basic switch is order code 3VA2225-5HN42-0AA0. Maximum power loss is 48 W. Dimensions: 86 mm deep, 140 mm wide, 181 mm high — fits standard MCCB panel cutouts for the 3VA2 frame.