Knife switch It is usually composed of insulating base plate, moving contact knife, static contact seat, arc extinguishing device and operating mechanism.
classification
1. According to different working principles, service conditions and structural forms switch It can be divided into knife switch, knife transfer switch, open load switch (rubber covered porcelain bottom knife switch), closed load switch (iron shell switch), fuse knife switch and combination switch.
2. The knife switch can be divided into single comparison, double comparison and three comparisons according to the number of knives and the operation mode. The rated current of commonly used three phase switch is 100A, 200A, 400A, 600A, 1000A, etc. Usually, in addition to the special high current knife switch Motor In addition to operation, manual operation is generally adopted. The one with fuse link as moving contact is called fuse knife switch, which is called knife fuse switch for short.
The knife switch structure is called knife switch;
The combination switch is composed of stacked contact elements and rotary operation.
matters needing attention
Only as Power Supply The knife switch for isolation does not need an arc extinguishing device. The rated current of the high current knife switch used in electrolysis, electroplating and other equipment can reach tens of thousands of amperes. This kind of knife switch generally adopts the structure of multiple circuit conductors in parallel, and can be cooled by water to improve the current density that the knife switch conductor can carry.
Knife switch is required to be able to withstand the electrodynamic force and heat generated by short circuit current in the circuit. Therefore, in the structural design of the knife switch, it is necessary to ensure that the contact knife will not spring open, weld firmly or burn out under the action of a large short-circuit current. The knife switch required to break the load current is equipped with arc extinguishing devices such as fast blade or arc extinguishing chamber.
The knife switch can be divided into single knife switch, double knife switch and three knife switch according to the number of knife switches; According to the conversion mode, it can be divided into single throw knife switch and double throw knife switch; According to the operation mode, it can be divided into handle direct operation type and lever type knife switch. Figure 1 shows the circuit diagram of the three phase single throw knife switch, which can be used to turn on or turn off circuit A, or to isolate circuit A from the power supply. Figure 2 shows the single pole double throw knife switch, which can be used to turn on or turn off circuit A or circuit B, and can also switch the power supply to circuit A to circuit B.
The transfer switch is used for the main circuit to transfer one group of connected devices to another group of connected devices.
Product model HD11F-100/38
HD11F-200/38
HD11F-400/38
HD11F-100/48
HD11F-200/48
HD11F-400/48
