The switch features power outage and undervoltage protection with bipolar and unipolar cut-off functions. Both versions can be combined with overload protection switches for comprehensive undervoltage and overload protection. Widely used in machine tools, power tools, and garden machinery. This is a safety switch that prevents automatic restart after a power failure; the device must be manually restarted by pressing the green start button. Type: AC220V KJD17 4 Pin Color: Black Material: Plastic Package Contents: 1 x Electromagnetic push button switch Note: The package includes only the items listed above. Other products are not included. Note: Lighting and monitor differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.