Universal Circuit Breaker CW3X Selection Parameters and Protection Function

Overview of universal circuit breaker CW3X

CW3X series universal circuit breakers are mainly used in various low-voltage power distribution fields. They can not only protect lines, but also protect electric motors and generators. Circuit breakers can be applied to large-capacity transformer branch circuits, load centralized control, long cable power supply, photovoltaic power generation and other new energy fields.

The rated working voltage of the universal circuit breaker CW3X is AC400V, 690V 50Hz/60Hz, and the rated current is 200 to 1600A. The equipment has three poles and four poles, and the installation methods can be divided into drawer type and fixed type. The inverted line can be used for wiring, and the intelligent controller models that can be provided to universal circuit breakers are: EN□X, EA□X, EP□X, EQ□X, EG□X, etc.

The circuit breaker meets the following implementation standards:

◆IEC60947-1 and GB14048.1-2012;

◆IEC60947-2 and GB14048.2-2008;

◆IEC60947-4-1 and GB14048.4;

◆ Obtained the national compulsory product certification CCC standard.

universal circuit breaker CW3X model meaning

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Universal circuit breaker CW3X operating conditions

◆The temperature of the air around the equipment should be between -5°C and +40°C.

◆The altitude of the installation site cannot exceed 2000 meters.

◆The relative humidity of the air at the installation site cannot exceed 50% when the highest temperature is +40℃, and it can have a higher relative humidity at a lower temperature.

◆Universal circuit breakers can resist pollution level 3, and also pass the GB/T2423.10 test requirements. They can withstand a frequency of 2Hz to 13.2Hz, and a displacement of ±1mm and a frequency of 13.2Hz to 100Hz. The acceleration is ±0.7g mechanical vibration.

◆The installation category of the main circuit of Changshu universal circuit breaker is IV, and the installation category of the remaining auxiliary circuits or control circuits is III, which is suitable for electromagnetic environment A.

◆Operable conditions: First, the circuit breaker has passed the test requirements of GB/T2423.1 and GB/T2423.2. The ambient air temperature can be as low as -25℃ (when equipped with EN controller, it can be as high as -40℃). When the temperature is higher than +40°C, the temperature can be reduced to +70°C (but if the temperature exceeds +40°C, derating is required). Also, when the altitude exceeds 2500 meters, derating should be considered.

Technical parameters of universal circuit breaker CW3X

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Universal circuit breaker CW3X protection function

◆Overcurrent protection function: It consists of phase line overcurrent protection and neutral line (N pole) overcurrent protection (four-pole and three-pole circuit breakers with external neutral line current transformers have neutral line overcurrent protection). The current and time parameters of line overcurrent protection are generally set by the manufacturer according to user requirements (also can be set by themselves), while the current and time parameters of neutral line overcurrent protection automatically follow the phase line setting value in proportion.

◆Ground fault protection (can be turned off -OFF).

◆Residual current protection function: Changshu universal circuit breaker CW3X-1600 is equipped with an intelligent controller with residual current protection function, so it can realize additional residual current protection function. The specific schematic diagram is shown below.

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◆Current unbalance protection: It is mainly used in places with relatively high requirements for three-phase current control. When the three-phase current unbalance degree is greater than the set value of the action threshold and exceeds the action delay (time limit action), then Changshu Universal The circuit breaker will trip or issue an alarm signal. If the three-phase unbalance is less than the setting value of the return threshold and exceeds the return delay (time limit action), the universal circuit breaker will release the alarm signal.

The current unbalance protection function can be set to turn on or off. Turning on includes sending an alarm signal or tripping.

◆Overload pre-alarm function.

◆Phase failure protection: It is usually used in places where a phase failure will cause the equipment to fail to operate normally or cause damage to the equipment. It is an extreme case of unbalanced circuit.

◆Current needs protection, low voltage protection, over voltage protection, voltage unbalance protection.

◆Reverse power protection, over-frequency protection, under-frequency protection, phase sequence protection, current unloading functions.

◆Zone selective interlocking (ZSI function): When multiple Changshu universal circuit breakers are used and wired together in the way of up and down connections, the regional interlocking (ZSI) function can ensure complete selective protection of the upper and lower levels of the equipment In this way, the operating range can be reduced, and the breaking time of the universal circuit breaker can be effectively reduced. The specific principle is shown in the figure below.

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◆Harmonic analysis function: The intelligent controller of Changshu CW3X circuit breaker can provide measurement of fundamental wave current, fundamental wave line voltage, fundamental wave phase voltage, fundamental wave power, and the current content rate (HRIh) ), harmonic voltage content rate (HRUh), total harmonic current distortion rate (THDI, thdi), total harmonic voltage distortion rate (THDu, thdu).

Universal circuit breaker CW3X secondary circuit wiring diagram

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The above are the selection parameters and protection functions of the universal circuit breaker CW3X, I hope to help everyone. okplazas.com Motor Mall is a professional agent selling switch factory related products, welcome to e-mail: [email protected] for consultation, and you can also contact WeChat customer service online at +86-13689242098 for product consultation!