Generally equipped with a simple arc extinguishing device, but its structure is relatively simple. The figure shows a high-pressure load switch with compressed air. Its working process is as follows: when opening, under the action of the opening spring, the main shaft rotates clockwise. On the one hand, the piston is moved upwards through the crank slider mechanism to compress the gas; On the other hand, through a transmission system composed of two sets of four link mechanisms, the main switch is opened first, and then the arc extinguishing switch is pushed to open the arc contact. The compressed air in the cylinder blows out the arc through the nozzle. According to the voltage used, it can be divided into high-voltage load switches and low-voltage load switches. There are six main types of high-voltage load switches. ① Solid gas generating high-voltage load switch: It uses the energy of the interrupting arc itself to generate gas from the gas producing material in the arc chamber to blow out the arc. Its structure is relatively simple and suitable for products with a voltage of 35 kV and below. ② Compressed air type high-voltage load switch: It uses the compressed air of the piston during the breaking process to blow out the arc, and its structure is relatively simple, suitable for products with a voltage of 35 kV and below. ③ Compressed air type high-voltage load switch: It uses compressed air to blow out arcs and can break large currents. Its structure is relatively complex and suitable for products of 60 kV and above. ④ SF6 type high-voltage load switch: Using SF6 gas to extinguish arc, it has a high breaking current and good breaking capacitor current performance, but its structure is relatively complex, suitable for products with 35 kV and above. [1] ⑤ Oil immersed high-voltage load switch: Utilizing the energy of the arc itself to decompose and vaporize the oil around the arc and cool it to extinguish the arc. Its structure is relatively simple, but its weight is large, suitable for outdoor products of 35 kV and below. ⑥ Vacuum type high-voltage load switch: uses vacuum medium to extinguish arc, with a long electrical life and relatively high price, suitable for products with a voltage of 220 kV and below
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