This electromagnetic push button switch features power outage protection and undervoltage protection for enhanced safety. Designed with bipolar cut-off and unipolar cut-off functions, compatible with overload protection switches. Durable plastic construction in black color, suitable for industrial tools, garden equipment, and high-power machinery applications. Technical specifications: AC220V, 4-pin terminal design, KJD17 model for reliable circuit control. Package includes 1x switch unit only. Installation requires manual activation via green start button after power interruption. Product dimensions may vary within 1-3cm tolerance. Color representation may differ slightly due to monitor settings.