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- ✅ Thanks to its wide voltage range, our relay is perfect for switching higher voltages using a 5V output.
- ✅ Thanks to its compact size the 1 channel relay can be used in almost every project.
- ✅ The KY-019 relay is used to control AC circuits. The relay acts as a switch that responds to a signal from the microcontroller. For this reason it is often used in IoT projects to control lights and other electronic devices.
- ✅ This product includes an E-Book that provides useful information on how to begin your project, it helps with a quick setup and saves time on the configuration process. We provide an array of application examples, full installation guides and libraries.
- weitere Produktdetails
Our AZ-Delivery Relay Modules handle many switching processes quickly and reliably.
The relay module KY-019 is used to control AC circuits and switches them ON or OFF.
The relay is one of the most important controls. It's an electrical switch that responds to a signal received from the microcontroller (like in Arduino or Raspberry Pi).
Relays are widely used in remote controls, communication, mechatronic devices, powerful electronics devices, etc. They can also be used to separate high voltage / electric current (such as AC or DC motors or any AC device, etc.) from low voltage / electric current (such as microcontrollers, sensors, etc.).

- Generously dimensioned relays to carry out many switching operations reliably.
- The module can be securely mounted in housings thanks to the practical mounting holes.
- Equipped with a transistor and diode, higher loads can be switched safely, reliably and with little current.
- Additional LED that shows the switching status of the relay.
Technical Data
Type | 1-channel |
Dimensions | 27 mm x 34 mm |
Maxium DC | 5 A 30 V |
Maximum AC | 5 A 50 V |
TTL control signal | 3.3V to 5V DC |
Contact type | Both: Normally closed - NC, normally open - NO |

Powerful elements
By using a DC5V relay and an SMD optocoupler that supports high-level triggers, the module can be used for demanding projects.

Quick Start Guide
When buying one of our high-quality products, you will also receive an inclusive e-book for a quick introduction to the world of Microelectronics.
Payment & Security
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