universal change over switch 3LB3,3LB4,3LB5 Meet standards:GB14048.5-1993, VDE0660 German standards 3LB3,3LB4,3LB5 change over switchApplication: The combination of products is 3LB Series Universal Switch technology is the introduction of Germany's Siemens Company.Starting primarily for three-phase asynchronous motor speed to load and auxiliary circuit switch, as well as the main circuit usedcan ...