Allen - Bradley 440R - M23147 is a safety relay of the Guardmaster series. The main parameters are as follows:
Model: MSR138DP
Power Supply: 24V AC/DC
Housing Width: 45 mm
Delay Time: 0.5 to 10 seconds, with infinite delay option
Inputs: 1 normally - closed (N.C.) + 1 light curtain (LC) input
Safety Outputs: 2 normally - open (N.O.)
Delayed Outputs: 3 normally - open (N.O.) relay outputs
Safety Category: Cat 4