What this MCCB is and what it does
The Siemens SENTRON 3VA2225-7HN32-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, designed for line protection in distribution panels and industrial switchboards. Its interrupting capacity is 330 kA at 240 V AC, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 4.5 kA at 690 V — meaning it can safely clear fault currents up to those levels depending on the system voltage, which is critical for maintaining selectivity and protecting downstream equipment in high-fault installations. Rated continuous current holds at 250 A from 40 °C up to 50 °C ambient, then derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C — useful when the breaker is installed in a warm enclosure or alongside other heat-generating devices. Maximum power loss is 48 W, which factors into enclosure thermal calculations if the panel is tightly packed.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits most Siemens SENTRON mounting bases and panel cutouts. The breaker is designed for line protection, not motor protection, so it lacks a voltage trigger, undervoltage release, ground-fault monitoring, and communication function — it is a straight thermal-magnetic or electronic trip unit for feeder and main breaker duty. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C, covering most indoor industrial environments.