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NDW3-4000 Air Circuit Breaker
By:Nader Updated:May 15,2020 17:52PM


The NDW3-4000 universal circuit breaker (hereinafter referred to as circuit breaker) can be applied to the distribution network with the AC 50Hz/60Hz, the rated current of 800A~4000A, the rated insulation voltage of 1000 V, the rated working voltage of AC220V/230V/240V, AC380V/AC400V, AC415V, AC660V/690V, AC1000V for distribution of electrical energy and protecting circuit and power equipment from overload, under-voltage, short circuit, single phase grounding and harm of other faults, and can also be used as isolation switch at the same time. The circuit breaker has multiple protection functions. It can avoid unnecessary sudden power failure while realizing highly accurate selective protection, and improve the reliability and security of the power supply system.


NWK21NWK21 - Conventional function, digital tube display, practical function and simplicity, which can especially adapt to the low-temperature places;
NWK21/V— Including all functions of NWK21, with the voltage measurement added;
NWK22— Conventional function, LCD display, multiple and diversified functions, applicable to high-end application places, and more powerful if applied to intelligent system;
NWK22/V— Including all functions of NWK22, with the voltage measurement & protection added;
NWK22/P— Including all functions of NWK22, with the voltage and harmonics measurement & protection added;
◆ Measurement function: With current, voltage, frequency, phase sequence, power, power factor, harmonics and other data measurement functions;
◆ Current protection features: A variety of overload long-time delay protection, a variety of short circuit short-time delay protection, short circuit transient protection,
ground protection, neutral line N-pole protection, current unbalance protection, MCR circuit breaker making capacity protection;
◆ Maintenance function: With fault record (8 times), historical current peak record, contact wear equivalent, query of operation times, clock function,
◆ self-diagnostic function, test function and fault display function;
◆ With a remote reset device,realize remote recovery after fault tripping of the controller.


The NDW3-4000 universal circuit breaker has obtained China Compulsory Certification (CCC) for products.