It breaks faults up to 25 kA per IEC 60947-2 at 400 V AC, and carries a 5 kA rating under UL 1077 and CSA C22.2 No. 235 for North American panels.
At 8 A, this MCB protects a circuit drawing up to roughly 1.8 kW on a 230 V line or 5.5 kW on a 400 V three-phase supply, depending on the load profile. That rating holds at 400 V AC, overvoltage category III — typical for distribution boards in industrial panels where fault currents are high. Wire range accepts 0.75 to 35 mm² solid or stranded, with a torque spec of 2.5 to 3.5 N·m on the screw terminals. The combined top and bottom terminals simplify daisy-chaining busbars or looping through the panel. The -25 to +55 °C ambient range covers most indoor industrial conditions; above 40 °C, derate per the thermal curve in the datasheet.
At 72 mm wide (4 width units of 18 mm), it occupies four adjacent slots on the rail. Any mounting position is permitted, which helps when the panel layout is tight or the rail is vertical. The sealable feature allows lockout/tagout compliance for isolation procedures.