Breaking capacity is the deciding parameter: 187 kA at 240 VAC covers high-fault service-entrance positions on 240/120 V split-phase panels; 121 kA at 415 VAC and 440 VAC suits European 400 V distribution; 75.6 kA at 500 VAC fits 480 V industrial feeders; the 3.7 kA at 690 VAC is a coordination-limited value for 690 V drives or mining gear where upstream current-limiting fuses handle the high fault. The line-protection design designation means the thermal-magnetic trip curve is calibrated for cable and busbar protection, not motor inrush — pair it with a contactor or starter for motor branch circuits.
Panel integration
Dimensions: 181 mm height, 105 mm width, 86 mm depth. No undervoltage release and no trip indicator — if your safety circuit requires UVR for loss-of-voltage protection, specify a variant with that option. The 4 W maximum power loss is low enough that no forced ventilation is required in a standard IP54 enclosure, but verify the internal temperature rise if ganged with other high-current breakers.