Siemens SENTRON 3VA2225-7HL32-0BC0 — 250 A MCCB with ETU320 Release
The Siemens 3VA2225-7HL32-0BC0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current (Iu) at 40 °C, with a 3-pole configuration and an ETU320 electronic overcurrent release. It's built for line protection in main distribution panels, switchboards, and industrial power feeds. The interrupting ratings are substantial: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 6.3 kA at 690 V — so it handles high-fault-current points like service entrances or transformer secondaries where the available fault current is high. For a panel builder or site electrical engineer: the 86 mm depth, 105 mm width, and 181 mm height fit the standard SENTRON 3VA2 mounting footprint. The 250 A rating holds flat from 40 °C up to 50 °C (full 250 A), then derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your ambient at the breaker is above 50 °C, factor that derate into your load schedule. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with headroom.
Selectivity and Coordination Notes
With the ETU320 release, selectivity (discrimination) with downstream breakers depends on the time-current curve settings. The electronic trip allows adjustable long-time pickup and delay, short-time pickup and delay, and instantaneous pickup. For a transformer feed or a main breaker feeding multiple subfeeds, this gives you the band to coordinate. The 50.5 W maximum power loss at rated current is worth noting for enclosure thermal calculations — especially in a sealed, non-ventilated panel.
Physical Integration — Panel Mounting
Dimensions are 86 mm deep, 105 mm wide, 181 mm tall. This mounts on a standard DIN rail or can be screw-mounted via the rear panel. The 3-pole design with line-side and load-side lugs accepts copper or aluminum conductors sized for 250 A. The two HQ auxiliary switches and the undervoltage release are factory-installed — no field assembly of those accessories. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.