The Siemens SENTRON 3VA2325-6HN32-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 250 A and a rated insulation voltage Ui of 800 V. It's fitted with an ETU350 electronic overcurrent release and a shunt trip (STL) auxiliary release, plus 2 HQ auxiliary switches. Breaking capacity reaches 242 kA at 240 VAC, 187 kA at 415 V and 440 VAC, 121 kA at 500 VAC, and 40 kA at 690 VAC — these are the fault-clearing figures that govern its application in high-fault industrial distribution.
What the ratings mean for panel fit
At 110 mm deep, 138 mm wide, and 248 mm tall, this MCCB occupies a standard SENTRON 3VA2 footprint. The 250 A frame with ETU350 release is the load-bearing spec: it's the continuous current the breaker can carry without tripping at 40–50 °C ambient. Above 55 °C, the rating derates linearly from 240 A at 55 °C down to 225 A at 70 °C — so if the breaker lives in a hot enclosure, the effective ampacity is lower than the nameplate 250 A. Maximum power loss is 37.5 W, which factors into enclosure thermal calculations.
Deployment context
As a SENTRON 3VA2 MCCB, it's designed for panel-mount installation in industrial switchboards and distribution boards, protecting feeder circuits and downstream equipment against overloads and short circuits. The 242 kA interrupting rating at 240 V suits high-fault-capacity installations like utility tie-ins or large motor control centers.