MCCB for feeder and distribution panels
The Siemens 3VA2225-7HL32-0DA0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current, configured for line protection in three-phase distribution. This is the variant with an integrated undervoltage release (UVR) — part number for the release is 3VA9608-0BB25 — and no auxiliary contacts or communication module. It's a current-production part, so no last-time-buy scramble; availability is confirmed at quote time through independent distribution channels.
Breaking capacity — what the numbers mean for your panel
Breaking capacity is the key selection parameter here: at 240 V it interrupts 330 kA, at 415 V and 440 V it handles 242 kA, at 500 V it drops to 187 kA, and at 690 V it's rated 6.3 kA. That 330 kA figure at 240 V is unusually high — this breaker is sized for high-fault-current industrial feeds where the available short-circuit current exceeds typical 65 kA or 100 kA MCCB ratings. At 690 V the 6.3 kA limit means it's not intended for 690 V main feeders; that's a coordination constraint to check against your transformer and upstream protection.
Thermal derating and continuous current
Rated continuous current Iu is 250 A, and it holds that rating from 40 °C through 50 °C ambient. Above 50 °C it derates linearly: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. Maximum power loss is 50.5 W. If your panel ambient runs hot — say inside a non-ventilated enclosure near other heat sources — use the 55 °C or 60 °C row for your ampacity calculation, not the 250 A nameplate.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. It's a 3-pole frame, so it occupies three modular spaces on a DIN rail or panel-mount base. The 86 mm depth is shallow enough to fit standard 200 mm deep enclosures with clearance for rear busbars. No auxiliary contact block is factory-fitted — if you need status feedback, you'll add one externally via the accessory slot.
Overcurrent release and protection functions
The overcurrent release is an ETU320 electronic trip unit — that's the standard electronic release for line protection on this frame size. It provides LSI protection (long-time, short-time, instantaneous) with adjustable settings. No ground-fault monitoring, no voltage trigger, no communication function, and no phase-failure detection on this variant. The trip indicator is not fitted, so you won't get a visual flag after a trip event — factor that into your maintenance walk-down procedure.
Environmental limits and storage
Operating temperature range is -25 °C to 70 °C. Storage range is wider: -40 °C to 80 °C. The storage maximum of 80 °C is relevant if the breaker sits in a non-climate-controlled warehouse or shipping container in summer — it can handle that, but don't commission it at that temperature; let it stabilize within the operating range first. Mechanical endurance is 20,000 operations (latching cycles).