dc 12v timing board timer relay module switch trigger time delay circuit

anti-reverse voltage input circuit, worry-wiring. modules can be triggered using the normally open type switch or a sensor signal input optocoupler isolation, anti-interference ability. there are 8 time range options, with a minimum of 0.1 seconds and a maximum of 1 hour. high current load (250vac|10a or 30v dc 10a).