The secret of business success lies in the people, products, services, three quality persist. Skilled persons, help of trend momentum, not responsible for others, it can choose a man advantage. Business is war, quality pioneer. Quality control to improve the credibility, reputation and expand sales. Manufacture sophisticated products, cultivating talents. Plastic corporate image, a quality brand name. Quality - remain constant key to success. Standards Implementation of quality, certified image building. A quality brand, cast-class corporate image. Computer monitoring and protection devices (referred to as protective devices), is the use of advanced computer technology, for BKD series flameproof low voltage AC vacuum feed switch (referred to as feeder switch) and protective devices designed to adapt to AC 50HZ, rated voltage 380V, 660V, 1140V, 3300V rated current up to 1000A three-phase ungrounded supply, transformer system, as the master switch, branch switch, can also be used as high-capacity starter motor imbalance control purposes. When the power supply circuit appears overload, short circuit, undervoltage, overvoltage, phase failure or leakage can automatically cut off the power. When the master switch has made a three-phase symmetry leakage and leakage blocking protection, leakage protection switch for branch backup protection; selective leakage protection and leakage blocking protection when used as a sub-switch. Overcurrent protection with inverse time characteristics, using a large short-circuit current export proximal no pressure release protection circuit. Features computer monitoring protection device is one of the new high-performance series of computer control and protection products, set control, protection, detection, communication in one, mainly used in industrial systems AC 50Hz, rated voltage of 660V and above the grid, improve the quality of the supply voltage control device. This means 32 microcontroller core, supplemented by industrial-grade peripheral chips, precision small transformers, small dedicated relays, as well as scientific algorithms to protect sensitive, reliable, high measurement accuracy. Using a variety of anti-jamming measures, the apparatus has a very high anti-jamming capability. In the design of the device, the use of standardized, modular hardware design, high-precision A / D converter, a dedicated power supply module. In the user interface, the use of large-screen LCD display localization, automatic backlight, menu-driven operation instructions for important operating license key, effectively prevent misuse occurred. The protection device stores a set value, and the online query, modify, with sequence of events, and events, telemetry, remote functions. Device configuration with isolated RS-485 standard asynchronous communication interface, communication can be a communication cable. Basic parameters Rated voltage: 1140V, 660V rated current: 200A, 400A, 630A integrated protection device power standard frequency: 50Hz. Comprehensive protection system for long-term work.