product description:
1.5V solid state relays 240V 2A, output with resistive fuse 240V 2A.
2.size: 80 * 56 * 25 (L * W * H) Weight: 60g
3.the input power supply: 5V DC (160MA)
4.the input control signal voltage:
(0-2.5V low state relay ON)
(3.3-5V high state relay OFF)
5.2.54CM pin and blue KF301 terminals to the control line is more convenient.

High and low meanings:

High signal triggers the trigger refers to the end (IN) between the power supply and the negative electrode has a forward voltage, usually in a positive trigger and trigger terminal connected to the power supply, when the trigger voltage or positive end has reached the trigger voltage, the relay is energized.

Low voltage trigger refers to OV, or trigger terminal voltage is lower than the positive supply voltage signal to trigger the negative terminal of the power supply between the low voltage that can be triggered to make relay, usually the that triggered a negative way with the trigger end of the power connection, the relay is energized.