What this MCCB is and what it does
The Siemens 3VA2225-5HL42-0AH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a 4-pole construction and a design focused on line protection — meaning it sits at the feeder or main distribution point, not on a specific motor or load branch. Its breaking capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V — per the datasheet, these are the maximum fault currents the breaker can safely interrupt at each voltage level, which is the figure that governs whether it coordinates with downstream devices in a selective scheme. The unit carries 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), and no undervoltage release or ground-fault monitoring is fitted from the factory.
Thermal derating and panel fit
The continuous current rating holds at 250 A from 40 °C up to 50 °C ambient, then derates linearly to 213 A at 70 °C — within tolerance for most enclosed switchboards, but worth checking against the actual ambient inside the enclosure if it runs near the upper end of the range. Physical dimensions are 86 mm depth, 140 mm width, and 181 mm height, which matches the standard SENTRON 3VA2 frame footprint for 250 A class breakers. Maximum power loss is 48 W — a figure to factor into the enclosure thermal budget if multiple breakers are ganged in a single panel.