A Solid State Relay (SSR) switches voltage just like a mechanical relay with coil and contacts, but without coil and contacts! A SSR doesn’t contain any electro-mechanical components and uses semiconductor technology to switch AC or DC current (depending on the type).
This module comes with 8 separate channels, each channel can switch AC of up to 250V with 2A.
A power supply 5V DC is required, with an output current of 100mA or more. Please connect the DC power supply to the DC+ and DC- pins on the board.
Channel control inputs are marked with CH1 to CH8 and require a control voltage of 3.3 to 5V DC (logic level).