What the ratings mean for fit
The Siemens SENTRON 3VA1225-5EF32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 250 A at 40 °C through 50 °C without derating — at 55 °C it still holds 243.3 A, dropping to 223 A at 70 °C, so the thermal curve stays flat across typical panel ambient. The TM240 thermal-magnetic release means the thermal element is fixed at 240 A frame; the magnetic trip threshold is set at the factory for short-circuit protection. The interrupting ratings are what decide panel SCCR: 187 kA at 240 V AC, 121 kA at 415 V AC, 36 kA at 440 V AC, and 17 kA at 690 V AC — the 415 V figure is the one most European industrial panels will reference for fault current coordination. The front face carries IP40 protection, so it's suited for enclosed panel mounting where no water jets or dust ingress are expected.
Panel integration and dimensions
The 3VA1225-5EF32-0KH0 measures 70 mm deep, 105 mm wide, and 158 mm high — a standard SENTRON 3VA frame size that fits DIN-rail or screw-mount panel layouts. The 105 mm width is the critical fill-factor dimension for multi-breaker rows; at 250 A continuous, it occupies the same footprint as lower-rated 3VA frames, so a panel originally laid out for a 160 A or 200 A 3VA unit will accept this breaker without re-drilling the mounting plate. The front IP40 rating means the breaker is protected against tools and wires >1 mm, but the enclosure itself must provide the overall panel IP rating. The shunt trip (STL) release is factory-installed; verify the coil voltage matches the control circuit before wiring.
Compliance and documentation
The reference code per DIN EN 81346-2 is Q, classifying it as a switching device in the functional structure. The product designation is molded case circuit breaker under the SENTRON brand. The storage temperature range is -40 °C to 80 °C, and the operating ambient range is -25 °C to 70 °C. The latching endurance is rated at 15,000 cycles. No undervoltage release, no communication function, no phase failure detection, and no ground fault monitoring are included on this variant — it is a pure line-protection MCCB with thermal-magnetic overcurrent release only.