The Siemens SENTRON 3VA1125-5EF32-0AG0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its interrupting capacity reaches 187 kA at 240 VAC, 121 kA at 415 VAC, and 75.6 kA at 440 VAC — figures that place it in the high-breaking-capacity tier of the 3VA platform, sized for main feeder or high-fault branch protection in industrial switchboards.
What the interrupting ratings mean for panel coordination
At 240 V the 187 kA SCCR means this breaker can safely clear a fault up to that level without upstream devices needing to intervene — critical for single-point coordination in a main lug-only panel. At 690 V the rating drops to 17 kA, so on 690 V systems the available fault current must be verified against that lower ceiling. The TM240 release is fixed, not adjustable for long-time pickup, but the thermal memory tracks prior heating — useful on motor-starting duty where repeated inrush could nuisance-trip a plain thermal breaker.
Mounting and integration notes
The 76.2 mm width (roughly 3 inches) and 70 mm depth fit standard 3VA panel cutouts and bus-bar centers. IP40 on the front means it is protected against solid objects over 1 mm but not sealed against moisture — mount inside a rated enclosure for washdown or outdoor environments. The auxiliary contact block (1 NO/NC auxiliary switch + 1 trip alarm switch HP) is factory-integrated, saving a DIN-rail slot for remote status and trip indication back to a PLC or annunciator panel.