Description Unit ACSSR is a single-phase AC solid-state relay control kit that combines a 10A single-phase relay with an ESP32C3 core control board. The Unit ACSSR supports Button Control, I2C Slave, and Modbus Networking, and its programmable full-color RGB LED helps show device status during setup and operation. The Unit ACSSR uses a contactless semiconductor relay design instead of a mechanical relay contact. This gives the Unit ACSSR fast switching speed, high operating frequency, long service life, low noise, reliable operation, and no arc spark, making it suitable for industrial automation, motor control, and temperature control systems. Features Unit ACSSR single-phase solid-state relay control kit with ESP32C3 controller. Supports AC 24 ~ 480V load supply and 10A load current. Three working modes: Button Control, I2C Slave, and Modbus Networking. I2C mode supports configurable I2C address, with I2C communication at 0x50 by default. Modbus mode supports configurable device ID, RS485PWR control, DC 9 ~ 24V input, 115200bps 8N1 communication, and default ID 0x0004. HY2.0-4P Grove interface supports I2C control with DC 5V input and 3.3V logic-level communication. Programmable SK6812 full-color RGB LED for status indication. Specifications Specification Parameter Controller MCU ESP32C3 Communication Interface I2C @0x50 Programmable RGB LED SK6812 Load Current 10A Input Control Voltage DC 3 ~ 32V Load Voltage AC 24 ~ 480V Input Control Current 5 ~ 20mA Off-state Leakage ≤5mA On-state Voltage Drop ≤1.6V Safe Operating Current Resistive load: 50%; Inductive load: 50% Electrical Life ≥1 million times Indicator Light Red (On: closed / Off: open) Product Weight 112.6g Gross Weight 137.8g Product Size 80 x 45 x 31mm Package Size 147 x 90 x 40mm Applications AC circuit switching. Motor equipment control. Temperature control equipment. Industrial automation control projects that require silent, contactless AC switching. Product List 1 x Unit ACSSR 1 x Single-phase solid-state relay 2 x 3.96-4P terminal blocks 1 x HY2.0-4P Grove Cable (20cm) 1 x Communication protocol manual Other Content Working Mode Configuration With the Unit ACSSR powered off, press and hold the middle button. Power on the Unit ACSSR. Rapid RGB LED blinking indicates that mode configuration has started. Click the button to switch modes: green for manual button mode, red for I2C communication mode, and yellow for Modbus communication mode. Press and hold the button to select and save the current mode. PinMap HY2.0-4P Black Red Yellow White PORT.A GND 5V SDA SCL ESP32-C3 G0 G1 G2 G3 G4 G5 G6 Unit ACSSR SCL SDA RGB LED BTN RELAY CTL RS485-TX RS485-RX Load Wiring Reference The product document provides a load wiring example for connecting the AC load side while using Grove or RS485PWR for control according to the selected working mode. Resources Unit ACSSR product document Unit ACSSR schematics PDF Unit ACSSR Arduino tutorial Unit ACSSR Arduino library Unit ACSSR I2C relay control example Unit ACSSR Modbus relay control example Unit ACSSR UiFlow1 block documentation Unit ACSSR UiFlow2 API documentation Unit ACSSR PDF document FAQ Which control modes does Unit ACSSR support? The Unit ACSSR supports Button Control, I2C Slave, and Modbus Networking. I2C address configuration and Modbus device ID configuration are supported. What AC load range does Unit ACSSR support? The Unit ACSSR supports AC 24 ~ 480V load voltage and 10A load current. The safe operating current entry lists 50% for resistive loads and 50% for inductive loads. Which interfaces are available for Unit ACSSR control? The Unit ACSSR provides an HY2.0-4P Grove interface for I2C control and RS485PWR interfaces for Modbus control. What does the RGB LED indicate during mode setup? During mode selection, green indicates manual button mode, red indicates I2C communication mode, and yellow indicates Modbus communication mode. What is included with Unit ACSSR? The package includes the Unit ACSSR, a single-phase solid-state relay, two 3.96-4P terminal blocks, one 20cm HY2.0-4P Grove cable, and a communication protocol manual.
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