The Siemens SENTRON 3VA2225-5HL32-0JL0 is a 3-pole molded case circuit breaker (MCCB) with a rated continuous current Iu of 250 A, fitted with the ETU320 electronic trip unit for line protection. Its interrupting ratings reach 187 kA at 240 V, 121 kA at 415 V, and 5.1 kA at 690 V, giving it headroom for high-fault installations. The ETU320 provides adjustable overload and short-circuit protection curves, making this breaker suitable for main feeders or large branch circuits in industrial switchboards.
Thermal derating and panel fit
The breaker carries its full 250 A rating from 40 °C up to 50 °C, then derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. In a sealed enclosure or high-ambient panel, that derating curve determines the real-world ampacity — size your conductors and ventilation accordingly. The 3VA2 frame measures 105 mm wide by 181 mm tall by 86 mm deep, which fits standard Siemens 3VA panel cutouts and busbar systems. The integrated shunt trip (STL) release allows remote tripping; the auxiliary contact block includes two auxiliary switches, one trip alarm switch, and one electrical alarm switch (HQ configuration).