The switch has the following functions, derived from power failure and undervoltage protection: Double-pole cut-off, braking function single-pole cut-off Both versions can be combined with overload protection switches for undervoltage and overload protection Widely used in machine tools, large power tools, gardening machinery, and more. This is a safety switch. Once the device is accidentally turned off, it will not turn on. You need to press the green start button to turn it on. Type: AC220V KJD17 5 pins Color: Black Material: Plastic Package Contents: 2 x Electromagnetic Push Button Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.