What this 3VA2 breaker is and what it does
The Siemens SENTRON 3VA2225-5KP32-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, designed for line protection in industrial distribution panels. Its interrupting capacity hits 187 kA at 240 V and 121 kA at 415 V and 440 V, which means it can handle high-fault scenarios without cascading upstream — useful for main or feeder duty where the transformer or utility feed delivers serious short-circuit current. The 250 A rating holds flat through 50 °C, then derates to 238 A at 55 °C and 200 A at 70 °C, so you don't lose headroom until the ambient climbs past 50 °C. This MCCB includes an undervoltage release (UVR) — the 3VA2225-5KP32-0CH0 variant ships with that auxiliary release built in, along with two auxiliary switches and one trip alarm switch (HQ type). It also carries a communication function, so it can talk to a higher-level control system for status and remote trip indication. The basic switch itself is order code 3VA2225-5KP32-0AA0, and this -0CH0 suffix adds the UVR and communication module. Physically, it measures 105 mm wide by 181 mm tall by 86 mm deep — a standard 3-pole MCCB footprint that drops into SENTRON panelboards and distribution blocks without re-drilling the mounting plate. The operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C, so it's fine for unheated electrical rooms or outdoor enclosures in temperate climates.
Breaking capacity across voltage levels — what it means for selectivity
The interrupting ratings step down as voltage rises: 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. That 4.5 kA at 690 V is the weak point — if you're feeding a 690 V motor drive, this breaker won't clear a high fault upstream. But on a 400 V or 480 V system, 121 kA gives you plenty of headroom for selective coordination with downstream breakers. The minimum breaking capacity is 375 A, so it's not intended for very low-fault branch circuits.
Panel fit and integration notes
The 105 mm width and 86 mm depth mean it fits standard SENTRON panelboard mounting rails and busbar systems. No special adapters needed for a 3-pole MCCB in a typical distribution panel. The power loss is 50.5 W maximum — that's heat you need to account for in the enclosure's thermal calculation, especially if the panel is densely packed or in a high-ambient room. The trip indicator is present, so you get a visual flag when the breaker trips — helpful for a maintenance tech walking the line. No ground-fault monitoring on this variant (the -0CH0 suffix omits it), so if you need GF protection, look at a different suffix or add an external GF relay.