The M5Stack Mini 3A Relay Unit (Model U023) is a compact automatic switching device designed to control circuits handling up to DC 3A at 30V or AC 3A at 220V. Measuring just 1.89 x 0.94 x 0.31 inches and weighing only 0.34 ounces, this relay unit serves as an intelligent control solution that uses minimal current to manage significantly larger electrical loads. The unit features three connection pins: ON, OFF, and COM (common terminal), allowing you to program GPIO outputs to direct the common terminal to either the ON or OFF position. With a rapid coil action time of 6ms and release time of 4ms, it delivers responsive switching performance. Operating on a single bus control system at 5V with 40mA power consumption, this relay unit integrates seamlessly with Arduino and UIFlow development platforms, supporting both Blockly and Python programming. The compact design includes 2 LE GO-compatible mounting holes for versatile installation options. Whether you're building automation systems, safety circuits, or custom switching applications, this relay unit provides reliable circuit control in a space-efficient package that's perfect for makers, hobbyists, and engineers working on electronic projects.