Where can find a Snap Lever Switch in your house?

Question

can you tell me wat there in

Answer 1

The attached  data sheet shows a snap switch base unit which can be fitted with various levers and a lever with a roller.

The most common home use for a lever switch is in a washing machine. The washer lid  activates a lever switch so that the spinning and agitation stops if the lid is opened.  

The common home lighting switch is a toggle switch, NOT a lever switch.

A lever switch with a roller is designed to minimized friction and wear.  A roller lever switch might be found in conjunction with a cam in a mechanical timer.  Again a washing machine with a mechanical timer might have one. A stack of cams  each with a lever switch is rotated by a motor. as the cams rotate the different height of the  profiles  activate the desired switches.    You may find a DPDT in this application

Lever switches are used as limit switches where something like a garage door will strike the lever and activate the switch thereby stopping the motor. Industrial garage roll-up doors may have a roller switch.    A home garage door may have a lever switch inside its housing but I'm not sure.

Answer 2

I believe the roller acts like a shock absorber and extends the life of the switch.

Answer 3

They are used to turn the lights on and off.

Answer 4

Light switches are snap action.

"SPDT Switch Without Roller"?

SPDT switches are rare in a household. Not in labs.

Have no idea what the roller does.