Description 1. Purpose MNS Low-voltage withdrawable switchgear for three-phase AC 50,60Hz, rated voltage 660V, rated current 4000A following three-phase four-wire and three-phase five-wire power systems as accepting and distributing power energy between. Widely used in power plants, power distribution center substations, industrial enterprises and high-rise buildings of PC and motor control centers MCC. This product meets the GB7251, ZBK36001, IEC439-1 (1992) standard. 2, the use of conditions 1, ambient air temperature does not exceed + 40 ° C, not lower than -5 ° C, and within 24 hours, the average temperature is not higher than + 35 ° C. 2, ambient air relative humidity at the highest temperature of not more than 50% 40 ° C when, at a lower temperature allows a greater relative humidity, such as + 20 ° C at 90%, but should take into account changes in temperature It may occasionally produce moderate condensation. 3, the indoor use, the use of location altitude must not exceed 2000m. 4, it should be installed in the absence of severe vibration and shock, and enough to make electrical components should not be corrosion sites. 3, the basic framework of the structural characteristics of the switchgear assembly modular structure adopted by KB steel by self-tapping locking screw fastening mutually connected into the basic framework, then the program needs to change, with the corresponding door, seal plate, partitions, mounting brackets and busbars, functional units and other parts are combined into a complete switchgear cabinet structure have been galvanized, can also be used aluminum-zinc plate production, and the implementation of modular installation (1E = 25mm). switchgear panel high quality steel processed by CNC machine tools, surface after pickling, phosphate treatment electrostatic spray, wear corrosion, both solid mechanical strength, but also reliable grounding continuity. Switchgear compartment can be divided into functional unit room, bus room, cable room, function of each unit is relatively independent and has a continuous metal plate or a fire-retardant board features wall strict separation between regions, to ensure safety and to prevent accidents spread . Flat horizontal bus mounted installation, effectively reducing the electrical and thermal stresses. There are bus-section 2 (30X10), 2 (60X10), 2 (80X10), 2 (100X10), 4 (60X10) 5 specifications, the corresponding bus current 1250A2000A, 2500A, 3200A, 4000A, neutral grounding bus N, PE is 60X10, drawer vertical bus is 50X30X5 Square copper bus, all buses are to undergo a tin-plated. MCC cabinet drawer 8E / 4,8E / 2,8E, 16E, 24E house specifications (1E = 25mm). Drawer having a connected position, the test position, off-position, shift position and a disengaged position. Each drawer has a mechanical interlock with the switch, when the switch is breaking, the drawer can be extracted or inserted; when the switch is in the closed position, the drawer can not be withdrawn or inserted. To prevent unauthorized operation, the operating mechanism can be locked with a padlock in breaking the switch position. With the specifications of the functional unit can be easily interchangeable drawers, each drawer corresponds to a functional unit has a pair of auxiliary contacts 16-32, to meet remote operation control, we need to measure the degree of electrical and computer interface, automatic monitoring system. 4, the technical parameters of the basic electrical parameters Rated working voltage AC380V, AC660V rated insulation voltage AC660V, AC1000V horizontal busbar rated current 1250A, 2000A, 2500A, 3200A, 4000A Vertical busbar rated current 1000A feeder circuits maximum current 2500A drawer motor control circuit maximum current 630A Maximum capacity of 320KW rated frequency 50,60Hz horizontal busbar peak withstand current (0.1S) 105KA, 176KA short time withstand current level of bus (1S) 50KA, 80KA vertical busbar peak withstand current (0.1S) 105KA vertical busbar short-resistance by the current (1S) 50KA Rated power frequency withstand voltage (1min) 2500V secondary power frequency withstand voltage (1min) 2500V Housing protection rating IP30, IP40 quality steel processed by CNC machine tools, surface after pickling, phosphate processing After the electrostatic spray, wear corrosion, both solid mechanical strength, but also reliable grounding continuity. Switchgear compartment can be divided into functional unit room, bus room, cable room, function of each unit is relatively independent and has a continuous metal plate or a fire-retardant board features wall strict separation between regions, to ensure safety and to prevent accidents spread . Flat horizontal bus mounted installation, effectively reducing the electrical and thermal stresses. There are bus-section 2 (30X10), 2 (60X10), 2 (80X10), 2 (100X10), 4 (60X10) 5 specifications, the corresponding bus current 1250A2000A, 2500A, 3200A, 4000A, neutral grounding bus N, PE is 60X10, drawer vertical bus is 50X30X5 Square copper bus, all buses are to undergo a tin-plated. MCC cabinet drawer 8E / 4,8E / 2,8E, 16E, 24E house specifications (1E = 25mm). Drawer having a connected position, the test position, off-position, shift position and a disengaged position. Each drawer has a mechanical interlock with the switch, when the switch is breaking, the drawer can be extracted or inserted; when the switch is in the closed position, the drawer can not be withdrawn or inserted. To prevent unauthorized operation, the operating mechanism can be locked with a padlock in breaking the switch position. With the specifications of the functional unit can be easily interchangeable drawers, each drawer corresponds to a functional unit has a pair of auxiliary contacts 16-32, to meet remote operation control, we need to measure the degree of electrical and computer interface, automatic monitoring system. 4, the technical parameters of the basic electrical parameters Rated working voltage AC380V, AC660V rated insulation voltage AC660V, AC1000V horizontal busbar rated current 1250A, 2000A, 2500A, 3200A, 4000A Vertical busbar rated current 1000A feeder circuits maximum current 2500A drawer motor control circuit maximum current 630A Maximum capacity of 320KW rated frequency 50,60Hz horizontal busbar peak withstand current (0.1S) 105KA, 176KA short time withstand current level of bus (1S) 50KA, 80KA vertical busbar peak withstand current (0.1S) 105KA vertical busbar short-resistance by the current (1S) 50KA Rated power frequency withstand voltage (1min) 2500V secondary power frequency withstand voltage (1min) 2500V Housing protection rating IP30, IP40