What this 3VA breaker is and what the ratings mean for your panel
The Siemens 3VA2225-7KP32-0DA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — meaning it sits at the feeder or main distribution point in a panel, not downstream on a motor branch. Rated 250 A continuous current with no derating needed up to 50 °C ambient, so in a typical 40 °C switchroom it runs at full nameplate. The adjustable thermal-magnetic trip unit covers 375 A to 2500 A (the / range), letting you set the instantaneous pickup to match cable or busbar withstand without swapping the breaker body. Breaking capacity is the headline number that decides whether this breaker clears a fault or welds shut. At 240 V it interrupts 330 kA — that's utility-grade fault current, typical for a transformer secondary or a large UPS output. At 415/440 V it still holds 242 kA, dropping to 187 kA at 500 V and 4.5 kA at 690 V. For a 690 V installation (say, a mining or marine distribution board) the 4.5 kA rating is the limiting figure — verify your available fault current at that voltage against this value. Three-pole, with an undervoltage release (UVR) built in and a communication function plus other measurement function — so it can report trip events and load data back to a BMS or SCADA system without an add-on module. No auxiliary switch fitted, no ground-fault monitoring. The trip indicator is absent, meaning you rely on the UVR or communication module for remote trip indication.
Panel fit — dimensions and mounting
Dimensions: 181 mm high, 105 mm wide, 86 mm deep. Fits a standard 3-pole MCCB footprint for a 250 A frame. Operating temperature range -25 °C to 70 °C; storage from -40 °C to 80 °C. Power loss at rated current is 50.5 W maximum — factor that into enclosure thermal calculations, especially in a sealed or high-density panel.