... ACContact Resistance 50mΩInsulation Resistance1,000mΩDielectric Strength1,500VLife Expectancy(Mechanical)25,000 for latching, 50,000 for momentLife Expectancy(Electrical ... )100,000 for latching, 1,000,000 for momentary Mechanical Configuration:latching&momentaryPushbutton Headround, mushroom, square, rectangular big square, ... Square≥24mm≥24mmBig Rectangle≥18mm≥24mm CCC CE wenzhou buzzer