What this MCCB carries
The Siemens SENTRON 3VA2325-6HL32-0HA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current (Iu) at 40 °C, with an ETU320 electronic overcurrent release. It's built for line protection — meaning it sits at the incoming feeder or main distribution point, not downstream on a motor or branch circuit. The breaking capacity is the headline: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. Those numbers tell you this breaker handles high-fault-current scenarios — transformer secondaries, large busway feeds, or industrial mains where available fault current runs high. The ETU320 release gives adjustable long-time, short-time, and instantaneous pickup, plus ground-fault alarm or trip if you add the optional module. No auxiliary contacts, no undervoltage release, no communication module on this variant — it's a straight feeder breaker with a shunt trip (STL) for remote opening.
Thermal derating and panel fit
The 250 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 240 A, then 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. If your panel ambient runs above 50 °C, you lose about 10 A per 5 °C step. The frame dimensions are 248 mm high, 138 mm wide, 110 mm deep — that's a standard 3VA2 frame footprint, so it drops into the same mounting holes and bus connections as other 3VA2 breakers in the 250 A class. No trip indicator on the front face; the ETU320 status is read through the LCD on the trip unit itself.
What's inside the can
The basic switch assembly carries order code 3VA2325-6HL32-0AA0. The integrated auxiliary trip is 3VA9688-0BL30 — that's the shunt trip coil that lets a remote signal or emergency-stop circuit open the breaker. The ETU320 release is field-configurable for LSI (long-time, short-time, instantaneous) protection curves. No ground-fault monitoring on this variant, no phase-failure detection, no communication function. Power loss at full load is 37.5 W maximum — relevant for panel heat budget calculations. Latching endurance is rated at 15,000 operations.