Siemens 3VA2225-5KP32-0DH0 — 250 A SENTRON MCCB with ETU850 Trip Unit
The Siemens 3VA2225-5KP32-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current (Iu) at 40 °C, in a 3-pole configuration. It carries an ETU850 electronic trip unit for line protection, with an undervoltage release (UVR) and integrated communication function. The interrupting ratings are 187 kA at 240 V and 121 kA at 415 V, making it suitable for high-fault-current distribution panels.
Interrupting Capacity and Selectivity Headroom
At 240 V the 3VA2225-5KP32-0DH0 breaks 187 kA — that is full rated short-circuit capacity, not a conditional rating. At 415 V it holds 121 kA, and at 690 V it still clears 5.1 kA. For a site electrical engineer coordinating with upstream breakers, the 187 kA figure at 240 V gives solid selectivity headroom against a transformer secondary fault. The 800 V rated insulation voltage (Ui) confirms the breaker is built for 690 V distribution without derating the insulation gap.
Thermal Derating and Continuous Current
The 250 A rating holds flat from 40 °C to 50 °C. Above that it steps down: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If the panel ambient runs at 60 °C, the breaker is good for 225 A continuous — useful for a panel OEM wireman sizing the main disconnect in a non-air-conditioned enclosure. Maximum power loss is 50.5 W, which factors into the enclosure heat budget.
Trip Unit and Auxiliary Components
The ETU850 is an electronic trip unit with communication capability — it can report status and trip events over the integrated communication function. The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ version), and a separate undervoltage release (UVR) is built in. The supplied basic switch is order code 3VA2225-5KP32-0AA0; the integrated auxiliary trip is 3VA9608-0BB25. A mechanical trip indicator is present. There is no voltage-trigger function and no phase-failure detection on this variant.
Mounting Dimensions and Panel Fit
The 3VA2225-5KP32-0DH0 measures 105 mm wide, 181 mm tall, and 86 mm deep. It mounts on a DIN rail or direct panel via the SENTRON 3VA base. The 105 mm width is three pole spaces wide — standard for a 3-pole MCCB in this class. A panel that was laid out for a similar-frame 3-pole MCCB (such as the 5SQ2370-2YA05 series) will accept this breaker without rewiring, provided the busbar or cable lugs match the 250 A terminal rating.