施多德接近开关近接开关方型开关叉车专用开关 LM12-3004NA LM12-3004PA LM18-3005NA LM18-3005PA 三线 常开; LM12-3004NB LM12-3004PB LM18-3005NB LM18-3005PB 三线 常闭施多德自动化; LM12-3004LA LM12-3004LA LM18-3005LA LM18-3005LA 两线 常开; LM12-3004LB LM12-3004LB LM18-3005LB LM18-3005LB 三线 常闭; LM12-3004NC LM12-3004PC LM18-3005NC LM18-3005PC 四线 一开一闭施多德自动化; LM12-2004A LM12-2