The Siemens SENTRON 3VA2125-5JQ36-0AA0 is a 3-pole molded case circuit breaker rated for 25 A continuous current, designed for line protection in industrial distribution panels. Its 121 kA breaking capacity at 415 V AC means it can safely interrupt high fault currents without upstream cascading — a key spec for high-available-fault installations like utility substations or large motor control centers.
Key ratings and what they mean for fit
The 25 A continuous rating is the load it carries without tripping under normal conditions — sized for a 25 A feeder or branch circuit. The interrupting capacity ramps from 187 kA at 240 V down to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3.7 kA at 690 V. That 121 kA at 415 V is the figure to check for most European 400 V industrial grids; if your available fault current at the panel is under that, this breaker holds coordination without a current-limiting fuse upstream. The ground-fault monitoring version uses summation current formation on the L-conductor, meaning it detects leakage by summing phase currents — common for solidly-grounded systems where you need earth-fault protection integrated into the breaker rather than a separate relay. Communication function is present, which on the 3VA platform typically means it can report status and trip events over a bus, though the specific protocol depends on the communication module ordered separately.
Panel integration and mounting
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. Operating temperature range is -25 °C to +70 °C, storage from -40 °C to +80 °C, so it's fine for unheated electrical rooms or outdoor-rated enclosures within those limits.