Siemens 3VA2225-5HN32-0CC0 — 250 A SENTRON MCCB with ETU350 Trip Unit
The Siemens 3VA2225-5HN32-0CC0 is a SENTRON molded case circuit breaker rated for 250 A continuous current (Iu) across a 40–50 °C ambient range, with a 3-pole configuration and an ETU350 electronic trip unit. This is a line-protection variant — no ground-fault monitoring, no communication module, no voltage-trigger function — built for straightforward feeder or main breaker duty in distribution panels. Breaking capacity runs 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 cover most industrial service-entrance and sub-distribution applications where high fault current is expected. The 800 V rated insulation voltage (Ui) gives headroom for 690 V systems.
Trip Unit and Auxiliary Hardware
The ETU350 electronic trip unit provides adjustable overload and short-circuit protection curves. The breaker ships with an undervoltage release (UVR) fitted as standard — design of the auxiliary release is undervoltage release (UVR) — and includes 2 auxiliary switches (HQ type) for status feedback to a PLC or indication panel. The integrated auxiliary trip is order code 3VA9608-0BB24; the supplied basic switch is 3VA2225-5HN32-0AA0. Maximum power loss is 50.5 W, which matters for enclosure thermal management when multiple breakers are ganged. Mechanical endurance is rated at 20,000 operations — typical for a fixed-mounted MCCB in a distribution board.
Environmental and Mounting
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The breaker measures 105 mm wide × 181 mm high × 86 mm deep — standard SENTRON 3VA2 footprint for 250 A frame size, so it drops into existing panel cutouts and busbar arrangements without modification.