The Siemens SENTRON 3VA1125-5EE32-0JF0 is a 3-pole molded case circuit breaker rated 25 A at 40 °C, with a breaking capacity of 187 kA at 240 V AC — that means it can safely interrupt a fault current of 187 kA at that voltage, which is high enough for most industrial main-feed applications where the available fault current is substantial. It is designed for line protection, not motor or feeder protection, so it is the right choice for the incoming supply side of a panel. The breaker carries a shunt trip (STL) and an auxiliary switch configuration of 1 auxiliary switch + 1 trip alarm switch HQ, which gives remote status indication and a remote trip capability — useful for emergency-off circuits or remote shutdown interlocks. Rated insulation voltage is 800 V, and the unit is rated for operation from -25 °C to 70 °C, with storage from -40 °C to 80 °C. The maximum power loss is 8.5 W.
Breaking capacity across voltages
The breaking capacity drops as voltage rises: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 17 kA at 690 V is still respectable for a 25 A frame — useful if you are feeding a 690 V drive or motor circuit.
Current derating with temperature
The breaker is rated 25 A continuously at ambient up to 50 °C. At 55 °C and 60 °C it derates to 24 A, and at 65 °C and 70 °C to 23 A. That is a mild derating curve — you lose only 2 A over a 30 °C rise, so it runs cool in a warm enclosure.
Mounting and integration
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high — a standard 3-pole MCCB footprint for a 25 A frame. It mounts on a DIN rail or panel, and the width of 76.2 mm (3 inches) is typical for this class, so it fits most existing panel layouts without re-spacing.