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The QDW3 series universal air circuit breaker is engineered for AC 50Hz power distribution systems with rated voltages of 400V and 690V, supporting currents up to 6300A. This breaker is ideal for protecting circuits and electrical equipment from overload, under-voltage, short-circuit, and single-phase grounding faults.
With intelligent and selective protection capabilities, the QDW3 enhances power supply reliability while minimizing unnecessary outages. It is widely used in power stations, industrial plants, mining operations (690V applications), and modern high-rise buildings, particularly in intelligent building distribution systems.
The breaker complies with international standards IEC60947-2 and GB14048.2, and carries CE certification. Its robust design features include energy-storage operation, air arc-extinguishing medium, and open frame installation.
Available in 3P and 4P configurations, the QDW3 series offers models ranging from 630A to 6300A capacity. The breaker's advanced protection functions include conventional circuit breaking, circuit-breaker failure protection, overcurrent protection, and overvoltage protection (OVP).
Key technical specifications include full breaking time of 20-30ms, rated short-circuit breaking capacity up to 120kA at 400V, and rated impulse withstand voltage of 8000V. The breaker is available in both fixed and draw-out versions to suit various installation requirements.
With certifications including ISO9001-2000, CE, CB, and CCC, the QDW3 series represents a reliable solution for demanding power distribution applications. Its intelligent protection features make it particularly suitable for modern electrical systems requiring high reliability and selective coordination.
