There is a 3-pin rocker switch broken at home. Can you change it to a 2-pin rocker switch? It's for electrical appliances. How to change it?

When you say three legs, you should be a single-pole double-throw switch. Generally, a switch controls two paths, but only one path is connected at the same time, that is, one path is connected and the other path is disconnected. Conversely, when the other path is disconnected, the other path will be connected. The two-pin switch you mentioned should be a single-pole single-position switch, which only controls one direction, either on or off. Static test: single pole double throw switch: the common terminal is generally in the middle. If the terminal number is 1 and the other two terminal numbers are 2 and 3 respectively, when 1 and 2 are connected, 1 and 3 have no effect; When 1 and 3 are connected, 1 and 2 are not connected; No matter which end of 1 is connected to 2 and 3, 2 and 3 are not connected by themselves. When the single-pole double-set switch only works in one circuit (the other circuit is not connected), it can be replaced by a single-pole single-set switch, otherwise it cannot be replaced by a single-pole single-set switch.