What the ratings mean for fit
The Siemens 3VA1112-5ED32-0AD0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated 125 A continuous at 40 °C, with a TM210 thermal-magnetic trip unit designed for line protection — meaning it protects cables and busbars from overload and short-circuit, not motor or generator circuits. The interrupting ratings tell the real story: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. That 187 kA figure at 240 V is the headline — it safely clears a fault of that magnitude without the arc flashing over or the breaker rupturing, which matters when you're coordinating downstream devices in a high-fault-current panel. At 690 V the 17 kA rating is still substantial for most industrial distribution. The insulation voltage is rated 800 V, so the breaker is physically built to withstand that voltage between phases and to ground, even though the interrupting capability drops at higher voltages.
Panel integration and mounting
The 3VA1112-5ED32-0AD0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. Three-pole footprint means it occupies three module-widths on a DIN rail or panel-mount base. The 70 mm depth is shallow enough that it clears most standard enclosure gland plates without interference. Rated for -25 °C to 70 °C operating ambient, with a maximum power loss of 28.1 W at full load — that heat has to be considered in the enclosure thermal calculation, especially if several breakers are ganged. Storage range is -40 °C to 80 °C.
Trip unit and design details
The TM210 designation means a thermal-magnetic trip with a fixed thermal pickup and magnetic short-circuit response — no electronic adjustment, no communication function, no undervoltage release, and no ground-fault monitoring on this variant. It's a straight line-protection breaker: set the rating, wire it, and it clears. The auxiliary switch design is listed as 3 auxiliary switches HQ, which means it has three built-in auxiliary contacts for status feedback to a PLC or indicator lamp. The supplied basic switch order code is 3VA11125ED320AA0, confirming the internal mechanism is the same as that variant.