The integrated circuit used is uncommon today. We found this configuration in Motorola's 1990 Linear Databook. The triac can be any of the TIC series.
In the figure we have a simple timer with the 555 feeding a relay directly. The circuit is from...
ON Semiconductor NTMJS1D5N04C 40V Industrial MOSFET Available from Mouser Electronics, these ON...
To control relays safely with double insulation, we suggest the circuit in the figure. The optical...