... ,correspond to 2006/42/EC,2004/108/EC,EN ISO 13849-1,EN 60947-4-1,EN 60947-5-1 and so on standards ... )You can choose manual reset or automatic reset,operation convenience.(4)It has self monitoring redundancy circuit ,safety performance is good ... .(6)It has removable terminals,facilitate installation and connection. Cat. 4 Relay SR4P2A1Y