Siemens SENTRON 3VA1112-4ED16-0AA0 — 125 A, 1-Pole MCCB with TM210 Trip
The interrupting rating reaches 75.6 kA at 240 V AC and 9 kA at 415 V AC, which covers most commercial and light industrial fault-current scenarios. At 415 V AC the rating drops to 9 kA, still adequate for typical 400 V distribution in smaller subpanels. The TM210 trip is a fixed thermal-magnetic design — no dials or interchangeable rating plugs. The thermal element tracks the 125 A frame through the ambient derating curve: it holds 125 A steady from 40 °C to 50 °C, then tapers to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C.
The 3VA1112-4ED16-0AA0 snaps onto standard DIN rail. Its width is 25.4 mm (1 in) — exactly one module — and depth is 70 mm (2.76 in) from the rail to the front face. Height is 130 mm (5.12 in). That single-module width is the key dimension for retrofit: it occupies the same slot as a 1-pole miniature breaker, so it drops into existing DIN-rail subpanels without widening the enclosure or re-spacing adjacent devices.
Electrical Ratings and Operating Range
Operating voltage is 415 V AC and 125 V DC.