What the ratings mean for fit
The Siemens 3VA2225-5HL32-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with a 3-pole configuration. Its interrupting capacity hits 187 kA at 240 VAC and 121 kA at 415/440 VAC — figures that tell you it can clear a bolted fault on a large transformer secondary or a high-capacity bus without the arc flashing over. At 690 V the rating drops to 4.5 kA, so this breaker is sized for 400/480 V distribution, not 690 V motor circuits. The 250 A frame carries a continuous current of 250 A across the 40–50 °C band; above that it derates to 241 A at 55 °C and 213 A at 70 °C, which governs panel ambient planning. The breaker is designed for line protection — meaning it sits at the feeder or main in a distribution panel, not as a motor-protective device. It ships with an undervoltage release (UVR) and a complement of two auxiliary switches plus one trip alarm switch (HQ design). The basic switch core is order code 3VA2225-5HL32-0AA0, so if you need a replacement internal mechanism, that's the sub-assembly to source.
Panel fit and mounting
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep. The 105 mm width is a standard 4-module footprint on DIN rail or bolted bus — verify the bus bar pitch if retrofitting into an existing panel. The 86 mm depth leaves clearance behind the door for gland plates or a rear cable channel.