KOOBOOK 2Pcs 5V 4 Channel Low Level Trigger Solid State Relay Module Board for Arduino

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5V solid state relays 240V 2A, output with resistive fuse 240V 2A,The input power supply: 5V DC (160mA) Size: 57*55*25mm,2.54cm pin and blue KF301 terminals connected to the control line is more convenient The input control signal voltage:(0-2.5V low state relays OFF),(3.3-5V state high relay ON).When the signal trigger has a low level trigger, the relay will be turned on and the device will be powered.Input power: 5V DC (<=160MA),Trigger signal: (0-1.5V state low level relay ON)(2.5-5V state high level relay OFF) Precautions:The power supply must be DC, 5V power supply;This module can only be used to control AC current and cannot control DC current Low-level triggering means that the voltage between the signal trigger terminal and the negative pole of the power supply is OV, or the voltage at the trigger terminal is lower than the voltage of the positive pole of the power supply. When the voltage is low enough to trigger, the relay is pulled in, usually A triggering method in which the negative pole of the power supply is connected to the trigger terminal, so that the relay is attracted