Siemens SENTRON 3VA1125-3GD42-0AA0 — 25 A 4-Pole MCCB, Line Protection
Its TM210 thermal-magnetic release handles overload and short-circuit conditions without external trip units. The interrupting capacity hits 75.6 kA at 240 V and 52.5 kA at 415 V — enough for most industrial service-entrance or feeder applications where high fault current is expected.
At 240 V the breaker clears 75.6 kA; at 415 V it handles 52.5 kA; at 440 V it drops to 32 kA, and at 500 V or 690 V it holds at 11.9 kA. That 75.6 kA figure at 240 V makes it a strong candidate for high-fault panels in North American 240/120 V split-phase or 240 V delta services.
Thermal Derating and Ambient Performance
At 55 °C it derates to 24 A, holds there through 60 °C, then drops to 23 A at 65 °C and 70 °C. That's a shallow derating curve — only 2 A lost over a 30 °C rise — so it's well suited for sealed enclosures or high-ambient panel rooms where other breakers would need a larger frame.
The 3VA1125-3GD42-0AA0 measures 70 mm deep, 101.6 mm wide, and 130 mm tall. That 101.6 mm width (4 inches) is standard for a 4-pole MCCB in this frame size — it occupies four 25 mm pole positions on a DIN rail or panel-mount footprint. Front protection is IP40, so it's fine for indoor panel use but not washdown.