What the ratings mean for fit
The Siemens 3VA1112-6EF32-0KH0 is a 3-pole SENTRON molded case circuit breaker rated for line protection, carrying 125 A continuous current (Iu) at 40 °C through 50 °C, then derating to 112.5 A at 70 °C. That thermal curve matters in a warm panel — if the enclosure ambient sits at 55 °C, you're limited to 120 A continuous, not the full 125 A. The TM240 thermal-magnetic release handles the overload and short-circuit trip curve. Breaking capacity runs 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 220 kA at 240 V tells you this breaker is built for high-fault locations — think transformer secondaries or large motor control centers where the available fault current is well above what a standard 65 kA MCCB could handle. The 690 V rating at 17 kA still covers most industrial 600 V class systems. Rated insulation voltage Ui is 800 V, so the breaker is rated for 690 V systems with margin. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Front protection is IP40 — fine for a closed panel, not for washdown exposure.
Integrated accessories and wiring
This variant ships with a shunt trip release (STL) for remote tripping, plus 2 auxiliary switches and 1 trip alarm switch (HQ configuration). The auxiliary contact version is already built in — no separate order needed for basic status feedback. The integrated auxiliary trip uses order code 3VA9688-0BL33 if you need a replacement module. No undervoltage release, no communication function, no phase failure detection, no ground fault monitoring — this is a straightforward line-protection breaker without add-on electronics. If you need remote monitoring or ground fault, you'd step up to a different 3VA variant with those modules. Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 70 mm depth fits most distribution panels. The 76.2 mm width matches the standard 3VA1112 footprint.