Relay, GuardMaster, MSR138DP, Single Function, Safety, with Delayed Outputs, 24 Volt AC/DC, 1 or 2 Normally Closed, for Light Curtains, Inputs, 2 Normally Open, Safety Outputs, 3 Normally Open, Delayed Safety Outputs, 0.5 - 10 Second, Time Delay, Removable Terminals, Automatic/Manual or Monitored Manual, Reset