Siemens SENTRON 3VA1112-4ED16-0AA0 — 125 A, 1-Pole MCCB with TM210 Trip
The Siemens SENTRON 3VA1112-4ED16-0AA0 is a 1-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 125 A at 40 °C, with a thermal-magnetic TM210 trip unit that provides overload and short-circuit protection without electronic adjustment. 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 240 V AC the 75.6 kA interrupting capacity is the headline number for panel builders sizing SCCR — it means this breaker can safely clear a fault up to that level without welding contacts or cascading failure upstream. 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. For a panel that runs warm, the 114 A floor at 70 °C is the number to use for continuous load planning.
Footprint and Panel Fit
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. Front face protection is IP40 — suitable for dry indoor panels where tools or fingers might contact the front but not for washdown zones. The breaker has no undervoltage release, no shunt trip, no communication module, and no ground-fault monitoring; it is a pure thermal-magnetic line-protection device with no auxiliary functions.
Electrical Ratings and Operating Range
Rated insulation voltage is 500 V. Operating voltage is 415 V AC and 125 V DC. Maximum power loss at rated current is 9.37 W — negligible for panel thermal budgeting but worth noting if the breaker is tightly packed. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum of -40 °C is the cold-chain relevant number — this breaker can sit in an unheated warehouse or cold storage before installation without damage.