It carries a rated insulation voltage Ui of 800 V and delivers interrupting ratings of 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V — so it handles high-fault-current scenarios typical in industrial distribution panels without needing an upstream current-limiting fuse.
Thermal derating curve — the real ampacity
The 125 A rating holds at 45 °C and 50 °C, then derates: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C.
Auxiliary contacts and release options
This variant comes with 2 auxiliary switches (HQ type) for status feedback — useful for PLC inputs or remote indication. The voltage trigger is present, meaning it can accept a shunt trip or similar accessory.
