What this MCCB is and what it protects
The Siemens 3VA2225-8HL32-0KA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 250 A at 40 °C and holds that rating through 50 °C — above that it derates linearly to 213 A at 70 °C, so the thermal curve governs the real-world ampacity in a warm enclosure. Three poles, no undervoltage release, no ground-fault monitoring. The auxiliary release fitted is a shunt trip (STL), which lets a remote signal (emergency stop, fire alarm, PLC output) open the breaker independently of the overcurrent mechanism. That makes this variant a fit for circuits where a controlled remote disconnect is required alongside the thermal-magnetic protection.
Breaking capacity — what the numbers mean for your fault level
The interrupting rating is voltage-dependent: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. At 415 V — the common industrial distribution voltage in many markets — 330 kA is well above what a typical secondary substation can deliver, so this breaker provides ample SCCR headroom for most line-side applications without needing a current-limiting upstream device.
Panel fit and integration
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. The 105 mm width is a standard 4-module footprint on DIN rail or for bolted mounting in a SENTRON distribution board. Depth of 86 mm leaves clearance behind a 200 mm deep enclosure gland plate. Maximum power loss is 48 W — account for that in the enclosure thermal budget if the panel is densely packed.