Knife switch directly starts the circuit

Knife switches include rubber-covered porcelain-based knife switches, iron-shell knife switches, slate knife switches, etc. It can directly start small motors below 7.5kW, the circuit is as shown in the figure. This type of switch is equipped with a fuse tube or a wiring post for connecting the fuse, so it is easy to replace the fuse. Operation method: When the knife switch is closed, the motor M will rotate; when the knife switch is opened, the motor M will stop. This circuit has a wide range of uses, such as water pumps, rice mills, flour mills and other small machinery.