... SR4P2A1Y,SR2P4A24The SR4P2A1B22 and SR4P2A1B24 are appropriate for E-stop Switch,Safety Gate.The SR4P2A1B24P is appropriate for safety light ... curtain(NPN).The SR4P3A1B24 is appropriate for E-stop Switch,Safety Gate.The SR4P2A1B24S is appropriate for two-hands ... automatic reset,operation convenience.(4)It has self monitoring redundancy circuit ,safety performance is good.(5)It has status indicators, ...