NB-DW45 Air Circuitl Breaker

Short Description:

NB-DW45 series air circuit breaker(hereinafter referred to as breaker) is suitable for the circuit of AC 50Hz with rated voltage 400V 690V and rated current up to 630A-6300A It is main used to distribute electric energy and protect circuit and power supply equipment from overload. Un-de-voltage short-circuit and singlephase earthing with intelligent and selective protection functions, the breaker can improve the reliability of power supply, and avoid unnecessary power failure. The breaker is applicable for power stations, factories, mines (for 690V) and modern high- building especially for the distribution system of intelligent building.

The products con-forms to IEC60947-2 standard

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ENVIRONMENTCONDITIONSFOROPERATIO

△ Temperature condition:-5°C~+40°C:the average value within 24h not exceed+35°C.

△ Elevation:altitude of installation place shall not exceed 2000m.

△ Atmosphere condition:relative humidity at+400C shall not exceed 50%. Hiaher humidity ispermissible atlower temperature condition. When the higher monthly avenge relative humidity is 90% in the humiddest month. The lowest monthly average temperature of this month is +25°C. And consider the influence of dew on product surface due to temperature changes.

△ Pollution grade:grade III.

△ The breaker should be installed according to the requirement on the instruction manuakthe verticalinclination degree shall not exceed 5C