Idem 180001 scr-2 relay-std screw terminals, rd the scr range of safety relays have been designed in accordance with en60204-1 for safety circuits and they may be used in conjunction with mechanical interlock guard switches, emergency stop switches, non contact guard switches or light curtains to achieve redundant monitoring and fault checking up to ple/cat4 iso13849-1. When dual circuit monitoring is used they can check the switch contacts for correct opening and re-closing, monitor for wiring short circuits and can be configured to check for correct opening of external machine contactors.
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