What this MCCB is and what it does
The SENTRON 3VA2225-6HN32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, designed for line protection in distribution panels and switchgear. Its interrupting capacity is 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 — figures that govern its ability to clear a fault without upstream damage. The breaker carries a shunt trip release (STL) and is configured with two auxiliary switches plus one trip alarm switch (HQ), giving remote status and trip indication.
Thermal derating and panel integration
At 40 °C, 45 °C, and 50 °C the breaker holds its full 250 A rating. Derating begins at 55 °C (241 A), dropping to 213 A at 70 °C — a continuous-current curve that matters when the breaker sits in a crowded, warm enclosure. Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount installations without rework. Maximum power loss is 48 W; factor that into enclosure thermal calculations if the panel is sealed or has limited airflow.