It is a 4-pole unit with front-front connections, a toggle control, and a backplate mount that accepts horizontal or vertical orientation. This is the rating that governs the conductor sizing and downstream coordination, not a peak or inrush figure.
The full curve: 90 kA Icu at 240 V AC, 50 kA at 415 V, 36 kA at 500 V, 35 kA at 525 V, and 10 kA at 690 V AC — all per IEC 60947-2. At 690 V the breaker still clears a 10 kA fault, which covers the lower end of industrial 690 V buswork. For selectivity schemes you would step to a category B breaker with a short-time delay rating.
Physical integration and environment
The 140 mm width for a 4-pole unit is standard for the NSX100N frame — it occupies a 35 mm connection pitch on the backplate. IP40 front-face protection means it is suitable for clean indoor panels but not washdown areas. Operating altitude is 0–2000 m without derating; above that, derate per the manufacturer's curve. The IK07 impact rating means it withstands a 2 J impact — enough for accidental tool drops in a panel but not for public-area abuse.
Durability and isolation capability
Mechanical durability is 50,000 cycles; electrical durability varies with voltage and load: 50,000 cycles at 440 V at In/2, 30,000 at 440 V at full In, 20,000 at 690 V at In/2, and 10,000 at 690 V at full In. For a distribution breaker that is switched infrequently (once or twice a year for maintenance isolation), these numbers are effectively life-of-installation.