Breaking capacity is 50 kA per IEC 60947-2 at 400 V AC, and 5 kA per UL 1077 / CSA C22.2 No. 235. The UL/CSA supplemental rating (5 kA) is the ceiling for North American supplementary protector applications. Rated for 72 V DC maximum, so it covers control-circuit DC rails (24 V, 48 V) but not higher DC bus voltages. The 1 A AC rating governs the motor or transformer primary; the DC rating governs the control side where used.
Suitability for operation is listed as mechanical engineering / industry — its primary deployment is industrial control panels, machine tool cabinets, and factory power distribution subfeeds. Humidity tolerance is 95% at 55 °C, derating to 55% at 70 °C and 35% at 75 °C — covers most indoor industrial environments including non-condensing washdown areas.