Siemens SENTRON 3VA2225-5KP32-0BH0 — 250 A MCCB with ETU850 Trip Unit
The Siemens SENTRON 3VA2225-5KP32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a rated continuous current Iu of 250 A and a rated insulation voltage Ui of 800 V. It is fitted with the ETU850 electronic overcurrent release, which provides adjustable protection curves for feeder and main breaker applications. The interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V — figures that govern selectivity and SCCR headroom in the distribution panel.
Thermal Derating and Ambient Constraints
The 250 A rating holds up to 50 °C ambient. Above that, the continuous current must be derated: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. The operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 50.5 W, which factors into enclosure thermal management for a panel builder.
Auxiliary and Communication Capabilities
This MCCB includes 2 auxiliary switches plus 1 trip alarm switch (HQ designation), an undervoltage release (UVR), and a communication function for integration into a plant-wide monitoring system. The integrated auxiliary trip module is order code 3VA9608-0BB11; the basic switch is 3VA2225-5KP32-0AA0. A trip indicator is present for visual fault confirmation.
Dimensions and Panel Fit
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep. The 105 mm width is the standard 3-pole MCCB footprint for the SENTRON 3VA2 frame; it mounts on a DIN rail or directly to a backplate. Verify the gland-plate cutout and phase-spacing against the existing panel layout before wiring.