User Guide
www.kitronik.co.uk
Relay Breakout
Relay Board -
5101
Circuit Overview
This circuit allows a low power logic-level device to operate a normally-open relay which can switch up to
16A 250VAC or 16A 30VDC. The board requires a power supply of 5V @ 80mA to function. The circuit uses a
transistor to allow a low current signal, such as that generated by a microcontroller, to activate the coil and
close the relay. An LED indicator is present on the board which shows when the relay is active.
Circuit Diagram
Page 1 of 3
User Guide
www.kitronik.co.uk
Relay Breakout
Mechanical Information
(All dimensions in mm)
Electrical Information
Minimum Input Voltage
Nominal Input Voltage
Absolute Max Input Voltage
Relay Switching Point
Nominal Operating Current
Nominal Operating Power
Absolute Max Switching Load
SIG Threshold Voltage
3.8V
5V
7.2V
3.75V
80mA
400mW
16A @ 30VDC/ 277VAC
2.1V
All values at 20°C
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User Guide
www.kitronik.co.uk
Relay Breakout
Pinout
Vcc
SIG
GND
Board power supply (5V)
Input signal (active high)
Common ground
Using the Relay with an Arduino
Connect the 5V pin on your Arduino to Vcc. Connect SIG to an output pin on your Arduino. Setting this pin
high will trigger the coil switching the load on. Setting this pin low will release the coil and return the relay
to its open position. Connect GND to the GND pin on your Arduino.
Then connect your load through the terminal block. The example above uses a motor powered by 4xAA
batteries but any load within the voltage and current limit of the terminal will work.
Important Application Notes
Be careful when working with high voltages, especially as arcing may occur on switching!
Attempting to switch the relay on and off very rapidly will not give reliable results.
Only use this board with mains voltages if you are suitably qualified to do so.
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