TSR20 is a safety expansion timer with delayed relay outputs, 3 NO + 1 NC, and a +24VDC power supply.The OFF-delay time (0,5s or 1,5s) is set with a switch on the front.
Catalog description
Safety/Expansion Relay Sentry TSR20 24VDC - 24 volt DC - 3 NO + 1 NC - OFF-Delay - 0.5 and 1.5 seconds