Relay Shield for Arduino (4 × 5 A)

  • AMP-B019
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Does your project need to control 120-220V circuits in your house? Try the Relay Shield.

At its core, the relay is just a mechanical switch that can be controlled by a microcontroller such as an Arduino. By this, there is no electrical connection between the control electronics and the load. This means that there is no interference, nor shorting to foil your plans. With the help of the relay you can switch on and off electrical appliances connected to your home, meaning you can finally create the smart home of your dreams. The relay can also come in handy to control certain devices. For example, to automatically dial a number on your prehistoric landline, just turn on the relay in parallel with the buttons.

The Relay Shield is an expansion board for an Arduino on which there are 4 independent relays, G5SB-14, connected to the Arduino digital pins. The current state of each can be found via the indicator LEDs located on the board. Each relay has a 3-wire terminal block which allows the relay to be used both in the "normally open" mode and in the "normally closed" mode. This is convenient if, for example, you need to turn on something when the microcontroller is de-energized.

The relay windings are connected to the Arduino pins 4 - 7 via the jumper cable. The input of a logic signal to these pins closes or opens the corresponding relay. If these contacts are already in use, don't worry, we have provided special solder holes just for this issue. Just remove the jumper and connect the relay to any other digital pin. The relay is controlled via built-in key, which allows you to use any voltage from 3 to 5 volts as a control signal. This means any Arduino model will do.

We recommend using the relay in conjunction with an Iskra Neo. When installing the relay above a Arduino Uno, or another board with a high USB/RJ45 connector, make sure that the terminals on the Relay Shield are not shorted by this connector. Use Stackable pin headers to create free space over the Arduino. The same pads will also be needed in the event that you want to put another shield over the Relay Shield.

If you need more than 4 relays, or you need to move more than 5 A, consider using individual relay modules.

WARNING! If you are not sure how to connect an electrical appliance working on 120 - 220V network to the relay, or if you have doubts and questions about how it is done, STOP. This voltage level can easily start a fire or end your life. Please make sure that you have a full understanding of the principles behind the relay and the dangers that are associated with high voltage. There are some mistakes you can only make once.

Relay Specifications

  • Winding Current: 80 mA
  • Maximum Switching Voltage: 30 VDC; 250 VAC
  • Maximum Switching Current: 5 A (NO), 3 A (NC)
  • Recommended Switching Frequency: < 1 Hz
  • Lifetime: minmum of 50,000 Cycles
  • Dimensions: 69 × 53 × 18 mm