... , 1NO1NC, 2NO2NC and 3NO3NC for L19BMomentary, means that when you push switch and then move your finger, the actuator will back to ... the original position.Latching, means that when you push switch once it will change state and stay in this pushed ... )O-- OOOStainless SteelOO Remark:O=AvailableMomentary, means that when you push switch and then move your finger, the actuator will back to ...