What it is and what it does
The Siemens SENTRON 3VA2225-5HL42-0AD0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current (Iu) and built around the ETU320 electronic trip unit. It's a line-protection device — meaning it protects cables and busbars from overload and short-circuit, not motor or generator circuits. The 250 A rating holds flat from 40 °C up to 50 °C; above that it derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C, so if your panel ambient runs warm, factor the actual load against the derated figure, not the nameplate 250 A. Breaking capacity is what decides if this breaker clears a fault without welding or bursting. At 240 V it interrupts 187 kA; at 415 V and 440 V it's 121 kA; at 500 V it drops to 79 kA; at 690 V it's 5.1 kA. That 187 kA at 240 V tells you this is built for high-fault-current panels — typically large distribution switchboards or transformer secondaries where the prospective short-circuit current is well above what a standard 50 kA or 65 kA MCCB can handle. Rated insulation voltage is 800 V (Ui), and the front face carries IP40 protection — meaning tools and fingers over 1 mm are kept out, but it's not sealed against moisture. The operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss at rated current is 48 W, which matters for enclosure heat load calculations if you're packing several breakers in a closed panel.
Integration and mounting
The breaker measures 140 mm wide, 181 mm high, and 86 mm deep. That 140 mm width on a 4-pole frame is standard for this class — it occupies four 35 mm DIN-rail modules (roughly 35 mm per pole). The 86 mm depth means it projects less than 90 mm from the mounting surface, which fits inside most 200 mm deep enclosures with room for wiring behind the breaker. It comes with 3 auxiliary switches (HQ type) pre-installed, so you have remote status feedback without adding a separate accessory block. No undervoltage release, no shunt trip, no ground-fault monitoring, no communication module — this is a bare line-protection breaker. The ETU320 trip unit is a basic electronic release.