The M5Stack Unit ACSSR is a DC to AC single phase solid state relay controller kit that comes with a single phase solid state relay + ESP32C3 controller board. It supports key control, I2C slave and Modbus networking modes of operation. It also features an integrated programmable full-colour RGB LED for state indication. This kit is contactless and adopts semiconductor switching elements. It has several advantages such as high switching speed, extremely long life, low switching noise, no switching spark and is much more reliable than most mechanical relays. Widely used in digital program control devices, motor control devices, temperature control, data processing systems and computer peripheral interface devices. It is specially designed for harsh environments with corrosion, humidity or explosion-proof requirements and frequent turn-on/off requirements. Features * Single-phase solid-state relay * Three operating modes. * Push button control * I2C slave (support device I2C address configuration) * Modbus networking (supports device ID configuration) * Programmable full-colour RGB LED * RS485PWR interface (support input 9-24V to power the device) Package Contents * 1x Single Phase Solid State Relay * 1x UNIT ACSSR * 2x 3.96 4-pin Terminal Blocks * 1x HY2.0 4-pin Cable (20cm) * 1x Communication protocol manual Specifications Main Controller ESP32C3 Programmable RGB LED SK6812 Load Current 10A Input Control Voltage 3-32VDC Load Voltage 24~480VAC Input Control Current 5mA~20mA Breakdown Leakage Current ≤5mA On-state Buck ≤1.6V Operating current safety series resistive load: 50% Inductive load: 50% Electrical lifetime ≥1 million times Indicator Light Red Net Weight 112.6g Gross Weight 137.8g Product Size 80 * 45 * 31mm Package Size 147 * 90 * 40mm Resources * Product Wiki * Communication protocol * Arduino Example: * M5Unit-ACSSR I2C Relay Control * M5Unit-ACSSR I2C addr Config * M5Unit-ACSSR Modbus Relay Control * M5Unit-ACSSR Modbus Slave ID Config * Libraries: * ArduinoModbus * Arduino485 * M5Unit-ACSSR Pinout M5Core (PORT A) GPIO22 GPIO21 5V GND UNIT ACSSR SCL SDA 5V GND ESP32-C3 (internal) GPIO0 GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6 UNIT ACSSR SCL SDA RGB LED BTN RELAY CTL RS485-TX RS485-RX https://elecena.pl/product/22727649/m5stack-single-phase-ac-ssr-unit-cdg1-1da-10a 2023-03-07 https://elecena.pl/product/22727649/m5stack-single-phase-ac-ssr-unit-cdg1-1da-10a 2023-12-27 https://elecena.pl/product/22727649/m5stack-single-phase-ac-ssr-unit-cdg1-1da-10a 2024-09-18 https://elecena.pl/product/22727649/m5stack-single-phase-ac-ssr-unit-cdg1-1da-10a 2024-11-29 https://elecena.pl/product/22727649/m5stack-single-phase-ac-ssr-unit-cdg1-1da-10a 2024-11-30 https://elecena.pl/product/22727649/m5stack-single-phase-ac-ssr-unit-cdg1-1da-10a 2025-04-29 https://elecena.pl/product/22727649/m5stack-single-phase-ac-ssr-unit-cdg1-1da-10a 2025-11-28 https://elecena.pl/product/22727649/m5stack-single-phase-ac-ssr-unit-cdg1-1da-10a 2025-11-29