Relay Shield V1.3 - 4-channel, 10 A / 250 V AC, for Arduino

Product overview

• Expansion module for Arduino-compatible boards with four relay outputs
• Switching capacity per channel: 10 A at 250 V AC or 30 V DC
• Direct control via the Arduino's digital outputs
• Four optoisolated inputs to protect the board
• Connectors for external load and power supply
• In-circuit jumper for configuring the power supply

Product description

This four-channel relay module expands Arduino boards with the ability to switch high-load AC and DC consumers. Each channel connects three digital outputs of the Arduino directly to a 10 A relay, allowing even beginners to control motors, heaters, or lights without having to work on electrical installations.

The optoisolation between the inputs and the relay coils protects the Arduino board from feedback and interference voltages from the switching circuit. The four relays operate independently of one another and each switches a separately wired circuit, allowing several consumers to be controlled simultaneously or at staggered intervals.

Applications include home automation, where pumps or valves are opened and closed on a timer, as well as experimental setups that switch LED lights and smaller DC motors. Controlling warning lights or activating electromagnetic locks are also among the possible applications. In every case, the logic runs on the Arduino, while the module provides the switching capacity.

The Arduino provides the control signals via four digital outputs. Power for the relay coils is supplied through a separate power input, which keeps the module independent of the Arduino's operating voltage. A separate external power source is required for the load connected to the relay contacts, providing 250 V AC or up to 30 V DC depending on the application. The jumpers on the module allow the coil voltage to be matched to the available external power supply.

Safety notice

This module is intended exclusively for building prototypes and for testing and development purposes, and is not intended for installation in household electrical circuits. Work on or near electrical installations and on high-voltage circuits must be carried out by qualified electricians; if you are unsure about safe wiring, consult a qualified electrician before commissioning. Avoid reversing the power supply polarity to prevent damage to the module.

Scope of delivery

• 1x Relay Shield V1.3 Arduino compatible 4-channel / Relay Shield V1.3