The switch has the following functions, derived from power outage and undervoltage protection. Bipolar cut-off, unipolar cut-off braking function Both versions can be combined with overload protection switches for undervoltage and overload protection Widely used in machine tools, large power tools, garden machinery and above. This is a safety switch. After the device is accidentally powered off, it will not turn on. You need to press the green start button to turn it on. Type: AC220V KJD17 5 Pin / AC120V YH02-A 4 Pin / AC220V KJD17 4 Pin / AC120V YH02-A 5 Pin color:Black Material:plastic<br><br>Package Contents: 1 x electromagnetic push button switch Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.