It is a 4-channel solid state relay board， which can be controlled by a wide range of microcontrollers such as Arduino， AVR， PIC， ARM， PLC， etc.

Features:
5V low level trigger solid state relay， output with resistive fuse (240V 2A).
It is a 4-channel solid state relay board， which can be controlled by a wide range of microcontrollers such as Arduino， AVR， PIC， ARM， PLC， etc.
Standard interface can be connected with microcontrollers.
With blue KF301 terminal， more convenient for control line.

Specifications:
Working Voltage: 5V DC (160mA)
Channel: 4 channel
Size: Approx.57 * 55 * 25mm / 2.2 * 2.2 * 1.0in
Weight: Approx.40g / 1.4oz

Input control signal voltage:
(0-2.5V state low relay OFF)
(3.3-5V state high relay ON)
Voltage Current: 1-Channel 13.8mA / 2-Channel 26.8mA / 3-Channel 37mA /  4-Channel 48mA
Trigger Voltage:3.3-5V
Trigger Current:2mA
Quiescent Current:0mA

Module interface:
DC+: Connect to positive power source (by relay voltage power supply)
DC-: Connect to negative power source
CH1: 1 relay module signal to trigger the end (effective at high level)
CH2: 2-channel relay module signal to trigger the end (effective at high level)
CH3: 3 relay module signal to trigger the end (effective at high level)
CH4: 4-channel relay module signal to trigger the end (effective at high level)

Note:
Power must be DC voltage， and voltage must be consistent with the relay voltage.

Package List:
1 * Solid State Relay Module