The Siemens SENTRON 3VA2225-5KP32-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, fitted with an ETU850 electronic trip unit for line protection. It carries a 187 kA interrupting rating at 240 V and 121 kA at 415 V, making it a high-fault-current unit for main or feeder protection in industrial switchboards.
Ratings and what they mean for fit
The 250 A rating holds at ambient temperatures up to 50 °C without derating; at 55 °C it drops to 238 A, and at 70 °C to 200 A. That means in a warm enclosure you need to check the actual ambient against the thermal curve — a panel hitting 60 °C knocks the usable current down to 225 A. The 187 kA at 240 V and 121 kA at 415 V tell you this breaker can interrupt very high fault currents typical at the service entrance or near large transformers. At 690 V the rating drops to 5.1 kA, so it is not a primary choice for 690 V distribution without coordination study. Rated insulation voltage is 800 V. Maximum power loss is 48 W.
Panel integration and dimensions
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep. The 105 mm width is a standard 3-pole MCCB footprint — it fits most Siemens SENTRON mounting bases and busbar systems without adapters. The 86 mm depth includes the case body; allow extra clearance for the shunt trip (STL) and auxiliary switch wiring.
Trip unit and accessories
The ETU850 is an electronic overcurrent release with communication capability. It supports voltage triggering (yes) and other measurement functions. The breaker ships with a shunt trip (STL) auxiliary release and 2 auxiliary switches (HQ). The basic switch is order code 3VA2225-5KP32-0AA0; the integrated auxiliary trip is 3VA9688-0BL33.