NXB-63M Magnetic-Only Circuit Breaker

The NXB-63M is a magnetic-only circuit breaker designed for short-circuit protection in low-voltage distribution circuits operating at AC 50Hz. It is available with rated currents of 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A and 63A, and can be supplied in 1P, 2P, 3P and 4P configurations. The rated operational voltage is 230V AC for the 1P version and 400V AC for the 2P, 3P and 4P versions. The rated insulation voltage is 500V. Two instantaneous tripping characteristics are available: C type with an instantaneous tripping current of 8In, and D type with an instantaneous tripping current of 12In. The appropriate characteristic should be selected according to the starting current and operating characteristics of the connected load. The rated ultimate short-circuit breaking capacity and rated service short-circuit breaking capacity are both 6kA. The rated impulse withstand voltage is 4kV. The product has a mechanical endurance of 20,000 operating cycles and an electrical endurance of 10,000 operating cycles. When multiple devices are installed side by side or when the product is used at high altitude, the rated current should be adjusted according to the number of adjacent devices, altitude, ambient temperature and actual operating conditions.