Air electromagnetic AC contactor: CJ20 and CJ40
In AC contactor, the air electromagnetic AC contactor is most widely used, the product series, most varieties, the structure and working principle is basically the same, but some products in the functional, performance and technical content, each having one's own knack in, with the need to select. Typical products are CJ20 AC contactor and CJ40 AC contactor, wherein CJ20 is the unified design products, CJ40 series AC contactor in series CJ20 basis, by the Shanghai Electric Institute of science organization of industry dominant plant in 90 time to update the design of a new generation of products, the paper will introduce the two exchange contactor.
CJ20 AC contactor is 90 time of domestic development, unified design new products, used to replace the CJ10 series AC contactor. It uses a straight moving double break bridge contact structure, contact with nickel silver, silver cadmium arc resistance, wear resistance and erosion characteristics of the alloy contact material; arc extinguishing system adopts the structure of three types: 40A above contactor with multiple longitudinal seam clay arc shield, arc can rapidly enter a longitudinal slit therein, make full use of the cooling area, strengthen the arcing effect. 25A contactor with U shaped iron interrupter, U shape iron interrupter system is the use of arc current through the magnetic field generated by the shape of iron: the arc column and the arc root fast motion, are very good cooling and go free, and free gas quickly left the contact gap, avoid arc in after current zero heavy fuel. While the 16A contactor without adding arc extinguishing device, using the double-breakpoint contact natural arc, it is utilized in the arc current zero proximal pole effect principle of breaking arc quenching; electromagnetic mechanism adopts a direct-acting magnet system, the following 40 E shaped core, 60A and above U shaped core; overall layout the two layer or three layer is disposed above, 63A products from aluminum alloy base, plastic bottom plate, and the arc shield composed of three section type three-dimensional structure.
A ) with arc extinguishing cover two layer structure ( b ) CJ20-40 contactor ) three layer two segment structure ( CJ20-25 contactor )
C ) CJ20-40 contactor longitudinal every arc d ) CJ20-25 contactor contact arc
1 - the arc shield 2, a moving contact 3 - static contact 4 - 5 - 6 - moving iron core coil short circuit ring 7, a static iron core 8, a reaction spring
9 - auxiliary contact 10 - rail clamp spring 11, housing 12 - U shape piece 13, arc
CJ20 AC contactor has the advantages of compact structure, with China's own characteristics, its structure and technical parameters as shown in Figure 1, in which a is a three layer two segment structure ( CJ20-25 AC contactor ), graph B with arc extinguishing cover two layer structure ( CJ20-40 contactor ), C is a CJ20-40 contactor contact arc system, D is a CJ20-25 contactor arc extinguishing system. As shown in figure a, to the coil 5 is energized, the movable iron core and the static iron core 7 4 generates the magnetic flux, a movable iron core 4 attracted by the downward movement and drives the moving contact 2 and the auxiliary contact of the 9 closed. The coil power, a reaction spring 8 the movable iron core 4 moves upward, the moving and static contacts apart, dynamic circuit is cut off.
CJ40 AC contactor to plastic grid type arc extinguishing cover instead of the traditional clay longitudinal seam type arc extinguishing cover, there is no clay arc shield brittle faults, and because the plastic grid sheet superior arc extinguishing performance, so that the arcing time is shortened greatly, improve the breaking capacity. Full range from 63A to 1000A consists of four basic frame of thirteen current specifications, i.e. 125 framework ( 63A, 50A, 100A, 125A ), 250 ( 160A, 200A frame, 250A frame ( 500 ), 315A, 400A, 500A ), 1000 ( 630A, 800A framework, 1000A ), of which 1000 frame three product specifications make zero arcing requirements, CJ40 AC contactor than with the capacity of CJ20 series AC contactor has considerably reduced the volume; 125, 250, 500 three ten frames of the current specifications in a specially designed quadrupole products. For three phase four wire power supply system in the need to break the midline of the choice. Rated working voltage for the 380V, 660V, 1140V direct-acting double-break structure.
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