It's the line-protection variant — meaning it's built for feeder and distribution duty, not motor-circuit protection with integrated overloads. The TM240 release gives you a fixed thermal pickup and magnetic trip tailored for cable and busbar protection. Breaking capacity is the headline number here: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. That's high-interrupting capacity for a 125 A frame — it'll sit comfortably upstream of smaller breakers in a distribution board where fault currents are high. The 690 V figure is worth noting if you're working on 690 V industrial networks; most MCCBs in this class drop off sharply above 480 V. Thermal derating is published across the full operating range: full 125 A up to 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. The 70 °C ceiling matches the max operating temperature spec.
The 3VA1112-4EF32-0CA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. An undervoltage release (UVR) is fitted as standard — part number 3VA9608-0BB24 for the integrated auxiliary trip.
The closest functional sibling is the 3VA1112-5EF32-0CA0, which shares the same 125 A frame, 3-pole count, and TM240 release but carries a different internal accessory configuration.
That storage spec governs warehousing and shipping — not a concern for the installed panel, but relevant if you're staging spares in an unheated warehouse. No communication function, no phase failure detection, no ground fault monitoring on this variant.