Low Voltage Intelligent Air Circuit Breaker

 QDW3 Air circuit-breakers(ACB) OverviewQDW3 series universal 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 6300A. It is mainly used to distribute electric energy and protect circuits and power-supply equipment from overload, under-voltage, short-circuit and single-phase earthing. with intelligentized 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-buildings, especially for thedistribution system of intelligentized building. This breaker conforms to IEC60947-2 and GB14048.2 and CE. Size A, B and C;From 400 A to 6300 A.Applications and functions Incoming-feeder and outgoing-feeder function in distribution systemsSwitching and protecting large powers, motors, capacitors, generators, transformers, busbars and cablesOverload protectionShort-time delayed short-circuit protectionInstantaneous short-circuit protectionUsed in building, industry, energy and infrastructuresFeaturesModular designComponents like auxiliary releases, motorized operating mechanisms, electronic releases, current sensors, auxiliary circuit signaling switches, automatic reset devices, interlocks and engagement operating mechanisms can all be exchanged or retrofitted in the back ground, thus allowing the circuit breaker to be adapted to new, changing required. Communication The use of modern communication-capable circuit breakers opens up completely new possibilities in terms of start-up, parameterization, diagnostics, maintenance and operation. This allows varieties of ways of reducing costs and improving productivity in industrial plants, buildings and infrastructure projects. Easy wiring by different terminals A wide variety of terminals are offered, to guarantee an optimal solution for connection to the power circuit under different applications.  Technical specifications Standard: IEC 60947-2Number of poles: 3-pole, 4-poleRated operational voltage Ue: 400 V, 690 VRated insulating voltage Ui: 1000 VRated frequency: 50 - 60 HzRated impulsed withstand voltage Uimp: 12 kVNeutral pole current-carrying capacity for 4-pole CBs: 100% InVersion: Fixed version, Withdrawable versionFeature details:○ Measurement and operation monitoringReal-time measurement of the power grid operating parameters, such as: frequency power factor active power: real-time indication of operating status, such as: fault status, alarm status system self-diagnostic status, normal operation.○ Query functionRunning parameter query, protection parameter setting value query, history fault record query, self-diagnosis fault information query and power grid measurement parameter query and other functions.○ Parameter setting functionThe following protection parameters can be set directly on the front panel of the controller: current value and time value of long-time overload protection, inverse current value of short-circuit short delay protection, definite time current value and time value, instantaneous protection current value, Current value and time value, N phase protection setting value, grounding current or residual current protection current value, time value and inverse time coefficient, unbalance value and time value of current unbalance protection, harmonic influence coefficient.The following operations can be performed on the front panel of the controller: System clock adjustment (only when this function is selected), and tuning the internal parameters of the system that can be set by all programmer (without programmer, but need password).○ Programming interface functionIt provides the interface with the programmer. It can modify some specific parameters, such as the function setting of signal output contact, the way of voltage measurement, system clock, protection characteristic curve, thermal memory function, communication address and communication baud rate.○ Communication network function (this function is only available for H type function controller)Controller provides standard RS485 interface, Modbus or Profibus-DP or DeviceNet protocol can be used to achieve data transmission to meet the different monitoring system "four remote" requirements.○ Test functionTest function sub-instantaneous tripping simulation test and non-tripping simulation test two kinds:(1) instantaneous trip simulation test: circuit breaker can be instantaneous action of the tripping test, after the action can display the circuit breaker's inherent action time.(2) non-tripping simulation test: select the simulation test current system for non-tripping test, alternately after the test shows the test current and the test current in the system delay time and simulation test fault category.○ Self-diagnosis functionThe controller itself appears some fault diagnosis alarm.○ Fault clock function (optional)Used to record the time of