Fail Safe Electronic Time Delay Device for Railway Signalling

Fail-Safe Electronic Time Delay Device is an electronic timer that replaces the timer which replaces the thermal element relay used in signaling circuits. This fully solid State device is relay less and the time base is generated through a quartz crystal to give a high repeat accuracy. It is meant to control railway signaling circuits where a fixed time delay of 60 or 120 seconds is required. It works on a 24V DC power supply.