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4. Residual current operated protective devices
Residual current protection in China from the mid-1970s to develop and market application, after 80 to 90 years to promote the use of continuous improvement and development has formed a perfect variety, complete specifications of the product range of residual current protection in low-voltage power grid Security protection has played a pivotal role.
China's production of residual current protective device products of all kinds: Household and similar places with residual current circuit breaker; industrial residual current relay and residual current circuit breaker (derived by the low-voltage molded case circuit breakers, residual current circuit breaker); portable residual current protector.
Household and similar places is divided into residual current circuit breaker residual current circuit breaker with overcurrent protection and overcurrent protection without residual current circuit breaker. Country production of residual current circuit breaker with overcurrent protection models C45Vigi, DZL18-20, DZL118, DZ12L, DZ47L and K series and so on. Rated current 63A, short-circuit breaking capacity of not more than 6kA, most electronic AC type residual current circuit breaker.
Without overcurrent protection for residual current circuit breaker domestic product Product Type: DZL43 (FIN), NFIN AB62 DZL33 DZL38. Rated current below 63A, which most of the rated voltage of 220V, rated current of 30A and below the single-phase circuit using diode residual current circuit breaker, most electronic AC type, also part of the part of the electromagnetic.
The industrial residual current breaker with overload and short circuit protection, domestic production of major products Model: DZ15L, DZL25 DZ10L and DZ20L maximum nominal amount of current to 630A, rated short-circuit breaking capacity most about 20KA.
Residual current relays domestic production of the main
To Product Model: JD1, JD3 & the the LJM type used mainly in the rural areas, the LTS residual current relay, main circuit rated current capacity of up to 800A. Portable residual current protection of domestic production of the main products Model: the LBX, LBC, CL1-10 and THD10 residual current protection plug, etc., are used in a single-phase circuit, rated voltage 220V, rated current of 16A and below, the main purpose supporting the use of, and supporting the export of household appliances and home appliances. Specified in IEC standard for mobile leakage protection, only type A (AC and DC dual-use), and our most AC products.
The yield of the residual current protection in China has been able to meet the needs of national economic development, but the production stays in imitation and repeated trial, the development of new products. Part of a joint venture to introduce foreign products or the introduction of foreign technology to develop products to scale production, most of the factory annual production capacity in the millions, backward mode of production, product reliability. Residual current circuit breaker as DZ15L the mid-1970s, China developed the first generation of residual current circuit breaker, technical indicators with significantly behind similar foreign products, but still occupy the conduction status.
Market issues can not be ignored
In the above four categories of products, the low-end products, high-performance, high-end, there is less since the color characteristics of the product. The affordable products repetitive and more, such as GJ20 manufacturers nearly 200 more than 160 DZ20 circuit breaker manufacturers. This one, the intensity of competition between the low-voltage electrical giant is also evident. Chint Group , has more than 600 sales companies and special sales agency in the country and abroad to set up five branches and more than 20 distributor; Delixi Group has more than 600 domestic marketing agency, more than 30 overseas outside marketing agency.
And these sales network is still expanding. With the sinking of the electricity market in China, the "war" between the smell of gunpowder and more concentrated in these enterprises.
On the product, the single species of major products, derived specifications less and fewer attachments, it is difficult to meet the requirements of different users, product design backward, poor quality, many enterprise product standards have not been in accordance with IEC standards and national mandatory standards.
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