Feature:

12V trigger delay normally open relay module, repeatedly triggering effective.
Delay time can be adjusted by potentiometer(clockwise to reduce, anticlockwise to increase), default 0-25 seconds, if you need more time, simply replace a larger capacitance or potentiometer.
Power supply terminal has anti-reverse diode for protection.
Trigger signal can be high level or low level signals, suitable for industrial control, the module can be triggered repeatedly.
It can be used in robotics, car lamp delay, intelligent product development, automation equipment, PLC development, intelligent home, burglar alarm delay, and development of electronic.

Specification:

Operating Voltage: DC 12V

Load Capacity: AC 250V 10A; DC 30V 10A

Delay Time: T(S)=1.1*R(Ω)*C(f); e.g. if capacitor is 4 resistor is 500KΩ, T=1.1*0.000047*500000=25.85sec.