Description The M5Stack Unit DCSSR M5-U140 is a DC-to-DC single-phase solid-state relay controller kit for switching DC loads with fast, quiet, contactless relay control. This M5Stack Single-phase DC SSR Unit combines a single-phase solid-state relay with an ESP32-C3 core control board, giving embedded projects a compact DC SSR module with button control, I2C slave control, and RS485 Modbus networking. Compared with a traditional mechanical relay, the M5Stack Unit DCSSR uses semiconductor switching for fast response, high operating frequency, long electrical life, low noise, and spark-free operation. The M5-U140 supports 10A load current, DC 24 to 220V load voltage, DC 3 to 32V input control voltage, I2C address 0x50, SK6812 programmable RGB status indication, and an RS485PWR interface that supports 9 to 24V device power. Use the M5Stack Unit DCSSR for DC circuit on/off control, motor equipment control, temperature control equipment, data processing systems, digital program-controlled devices, and computer terminal interface circuits where a DC solid-state relay, Modbus relay, or I2C relay controller is preferred over a mechanical relay. Features M5Stack Unit DCSSR M5-U140 single-phase DC solid-state relay controller kit. Includes a single-phase solid-state relay and ESP32-C3 core control board. Three working modes: manual button control, I2C slave control, and RS485 Modbus networking. I2C interface uses default address 0x50 and supports device I2C address configuration. Modbus networking mode supports device ID configuration for RS485 control systems. Programmable SK6812 full-color RGB LED for relay status and mode indication. RS485PWR interface supports 9 to 24V device power supply. 10A load current with DC 24 to 220V load voltage for DC load switching. Contactless semiconductor relay design for fast switching, low noise, and no operating sparks. Grove HY2.0-4P Port A for GND, 5V, SDA, and SCL connection. Specifications Product M5Stack Unit DCSSR / M5Stack Single-phase DC SSR Unit SKU M5-U140 / U140 Controller MCU ESP32-C3 Communication interface I2C at 0x50, RS485 Modbus, manual button control Programmable RGB LED SK6812 Load current 10A Input control voltage DC 3 to 32V Load voltage DC 24 to 220V Input control current 5 to 20mA Off-state leakage
