It's a 3-pole unit rated for 125 A continuous current at 40 °C — and it holds that 125 A all the way up to 50 °C before it starts to derate, so you get the full rating in most ventilated enclosures. The thermal-magnetic release is a TM240, which means the thermal pickup is fixed and the magnetic short-circuit trip is adjustable. Breaking capacity runs 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — that's a lot of headroom for a 125 A frame, especially on the common 415 V industrial bus.
The 125 A continuous rating is the number that locks in your feeder size. The thermal derating curve is gentle: 125 A through 50 °C, then 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C.
Undervoltage release and auxiliary options
This 3VA1112-3EF36-0CA0 comes with an integrated undervoltage release (UVR) — the design is a dedicated undervoltage release, part of the auxiliary release set. There's no auxiliary contact version on this variant, so if you need a status feedback contact for a PLC or a remote indication, you'll add one externally. The integrated auxiliary trip is listed as 3VA9608-0BB24 — that's the factory-fit shunt trip or UVR module if you need to change it later.
Panel fit — dimensions and mounting
The breaker measures 130 mm high, 76.2 mm wide (that's 3 inches exactly — standard for a 3-pole MCCB frame), and 70 mm deep. Three-pole, screw-clamp terminals, line and load lugs are standard. If you're swapping this into a panel that was laid out for a different 3-pole MCCB, check the 76.2 mm width first — that's the mounting centers for the bus bars or the DIN-rail adapter.