The Siemens 3VA1112-6MH32-0DH0 is a 3-pole IEC frame 160 molded case circuit breaker rated at 125 A continuous current (In) with a 70 kA breaking capacity (Icu) at 415 V AC — class H in the 3VA1 family. That 70 kA figure means it can safely interrupt a fault current up to that level without failing, which is the spec that governs coordination with upstream switchgear in a distribution panel. The breaker ships with a TM120M thermal-magnetic release, set for starter protection, and the adjustable short-circuit pickup Ii spans 5 to 15 times In, giving the commissioning engineer room to tune for motor inrush without nuisance tripping.
What the ratings mean for fit
The 125 A continuous rating on an IEC frame 160 body means this breaker is sized for motor branch circuits or feeder loads in the 60–100 kW range on a 400 V system, depending on the load duty. The 70 kA Icu at 415 V is the maximum short-circuit current the breaker can clear once — if your available fault current at the panel is below that, the breaker holds its integrity and does not vent plasma into the enclosure. The TM120M thermal element provides inverse-time overload protection; the magnetic instantaneous element handles short circuits. The adjustable Ii range (5–15× In) lets you set the magnetic trip point between 625 A and 1875 A, which is the primary tool for coordinating with downstream contactors or soft starters. The undervoltage release (UVR) is rated for 208–230 V AC, 50/60 Hz. That coil drops the breaker open when control voltage falls below about 70% of rated — standard for safety circuits where a loss of control power must disconnect the load. The two auxiliary switches (HQ) and one trip alarm switch (HQ) provide status feedback to a PLC or indicating lamp: the aux switches track the main contact position, the alarm switch signals a trip event, not a manual open. The nut keeper kit is a mechanical aid for panel builders — it retains the terminal nuts during wiring, which saves time on a crowded DIN-rail assembly.
Lifecycle and sourcing reality
The lifecycle stage for this order code is listed as current, meaning Siemens has not issued a phase-out notice or last-time-buy window for the 3VA1112-6MH32-0DH0 as of the latest data. That is the standard status for a production-line part that is still being manufactured and stocked through normal Siemens distribution channels. For a BOM line that requires this exact code — with the TM120M release, UVR, and auxiliary switch configuration — the part is specified into the design and available to order. Availability and current pricing are confirmed at quote time against an RFQ through independent distribution.