Rated 125 A continuous at 40 °C with the TM120M thermal-magnetic release, it holds that full rating up to 50 °C before a gentle derate curve kicks in: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. That thermal stability matters when the breaker is enclosed in a warm panel next to contactors and drives.
The SCCR curve on this unit is the real selector: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. At 240 V, that 220 kA rating covers virtually any utility-fault scenario in North American panels.
Starter protection design — built-in auxiliary switch count
The starter protection designation means the magnetic trip curve is shaped for motor inrush — it rides through the start transient without nuisance tripping. This variant ships with the supplied basic switch 3VA11126MH320AA0 and carries 4 auxiliary switches HQ as standard. That's four form-C contacts for status feedback to the PLC or safety circuit, which typically saves buying a separate auxiliary block.
DIN-rail footprint and environmental range
Mounts on standard DIN rail. Dimensions: 70 mm depth, 76.2 mm width (3 in), 130 mm height (5.12 in) — the 3-pole width is the critical dimension for panel layout.