Siemens 3VA2225-5KP32-0AD0 — 250 A SENTRON MCCB for Line Protection
The Siemens 3VA2225-5KP32-0AD0 is a 3-pole molded case circuit breaker from the SENTRON family, rated for 250 A continuous current and designed specifically for line protection. This is the version with communication function and three integrated auxiliary switches (HQ design), but no undervoltage release or ground-fault monitoring — it's a straight line-protection MCCB for main feeder or large subfeed applications. The interrupting capacity is voltage-dependent: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. That 187 kA at 240 V is a high-interrupting rating — suitable for transformer secondary or bus-duct protection where available fault current is substantial. The 4.5 kA at 690 V is the low-voltage end of its capability; if your system runs 690 V with high fault current, verify coordination upstream. Thermal derating starts at 55 °C: the breaker carries a full 250 A from 40 °C through 50 °C, then drops to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If the panel ambient runs above 50 °C, size the breaker for the derated current, not the nameplate 250 A. Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard 3-pole MCCB footprint for 250 A frame. The 86 mm depth is the mounting depth behind the panel face; ensure gland-plate clearance if the breaker is rear-mounted in a shallow enclosure. Power loss at rated current is 48 W maximum — account for that in the panel thermal budget.
Integration — Panel Fit and Auxiliary Configuration
This MCCB ships with three factory-fitted auxiliary switches (HQ design) and a communication function module. The auxiliary switches provide remote status indication (open/closed/tripped) without needing a separate accessory kit. The communication function allows integration into a higher-level monitoring system — verify protocol compatibility with your BMS or SCADA gateway before specifying. No undervoltage release, no shunt trip, no ground-fault monitoring are included. If your application requires undervoltage protection or GFCI, you need a different variant (the 3VA2225-5KP32-0AD0 is a bare line-protection breaker with aux switches and comms only). The basic switch variant is 3VA2225-5KP32-0AA0 — this -0AD0 suffix adds the auxiliary switches and communication. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The breaker can be installed in unheated enclosures as long as the ambient stays above -25 °C during operation.