Compatible 4-Channel 5V Relay Kit for Arduino

This kit lets you control up to 4 independent loads (bulbs, motors, etc.) from Arduino or 5 V microcontrollers, giving you the flexibility to automate several devices in a single project. Compared with lower-channel modules, it reduces wiring and the space required. Unlike solid state relays (SSRs), this mechanical relay offers lower cost and can switch both AC and DC up to 10 A, although with slower switching speed and a shorter service life than SSRs.

The module measures approximately 73 mm × 50 mm × 19 mm and weighs around 55 g. The package includes the assembled 4-relay board with screw terminals, signal input pins and a pre-soldered relay socket. Cables, power supply and any additional items are not included.

When switching AC loads, installation must be carried out by qualified personnel, ensuring secure connections and avoiding contact with live parts. Local electrical regulations must be observed. The relays provide isolation, but it is recommended to enclose the module if it is installed in exposed environments.

The most common issues include switching failure due to overload, mechanical wear after many cycles (typical service life: 100,000 operations at nominal load), contact welding caused by overvoltage, or no response if the control signal is insufficient (<4.5 V). It is recommended to visually inspect the contacts, check continuity and verify the control voltage for diagnosis.

A 5V relay allows Arduino to control higher-power electrical devices that cannot be driven directly by the board, such as lights or motors.

This kit includes 4 independent relays for controlling multiple loads at the same time.

You can control loads such as lights, motors and other electrical devices that operate within the relay's switching limits.

Yes, it is compatible with Arduino boards that operate with 5V signals, making it easy to integrate into a range of projects.

Each relay can switch up to 10A at 30V DC or 10A at 440V AC.