1 Channel 5V Relay Module KY-019

1 Channel 5V Relay Module KY-019

Relay
DET569
Part.No: KY-019
€1.95
In Stock
Immediate Dispatch
KY-019 1-Channel 5V Relay Module lets your Arduino switch AC 250V/10A or DC 30V/10A loads with just a 5mA trigger signal. Perfect for controlling home appliances, lights, and motors from a microcontroller.

 

The KY-019 1-Channel 5V Relay Module (MPN: KY-019) is a ready-to-use relay breakout board designed to let 5V microcontrollers — like Arduino UNO or Nano — switch high-voltage, high-current loads that the microcontroller cannot drive directly. By using the relay as an electrically isolated switch, you can safely control AC mains appliances (up to 250V/10A) or DC loads (up to 30V/10A) with nothing more than a digital output pin.

Key Features

  • High-Voltage Switching: Handles AC 250V/10A and DC 30V/10A → controls fans, lamps, heaters, and motors safely
  • Low Trigger Current: Only 5mA needed to activate the relay → direct connection to any Arduino digital pin without a driver IC
  • 5V Operating Voltage: Matches Arduino logic levels → no level-shifting required
  • Compact Form Factor: 50 × 26 × 18.5mm with 4 mounting holes (Ø 3.1mm) → easy to integrate into enclosures or project boards

Pinout & Wiring

PINSymbolDescription
1GNDGround — connect to Arduino GND
2VCCSupply voltage — connect to Arduino 5V
3SIGSignal input — connect to Arduino digital output pin

Wiring note: Connect VCC to 5V, GND to GND, and SIG to any digital pin. Write digitalWrite(pin, LOW) or HIGH to activate/deactivate the relay depending on your module's active-low or active-high configuration. Always wire the high-voltage side with the power disconnected.

Compatibility

  • Arduino UNO / Nano / Mega: Native 5V logic and 5mA trigger current — plug-and-play compatible, no extra components needed.
  • Raspberry Pi (with caution): RPi GPIO pins are 3.3V; verify your specific module's trigger threshold before connecting directly.

Typical Applications

  • Turning household lamps or box fans on/off from an Arduino sketch
  • Automated irrigation systems — switching a 220V water pump via a soil-moisture sensor
  • Smart home prototype — voice or app-controlled outlets using ESP8266 + KY-019
  • Garage door or gate opener control circuit
  • Temperature-based heater/cooler switching with a thermistor or DS18B20 sensor

Technical Specifications

ParameterValue
InterfaceDigital Signal (SIG pin)
Working Voltage5V DC
Trigger Current5mA
Max Load (AC)250V / 10A
Max Load (DC)30V / 10A
Dimensions50 × 26 × 18.5mm (L × W × H)
Mounting Holes4 × Ø 3.1mm
MPNKY-019

FAQ

Q: Can I control a 220V appliance directly with the KY-019?
A: Yes — the relay contacts are rated for AC 250V/10A, so a standard 220V European mains load within that current limit can be switched. Always follow electrical safety practices and ensure proper insulation on the high-voltage wiring.

Q: Do I need a transistor or driver between Arduino and the SIG pin?
A: No. The KY-019 module includes the necessary driver circuitry on-board; a standard Arduino digital output providing 5mA is sufficient to trigger the relay.

Package Contents: 1 × KY-019 1-Channel 5V Relay Module

⚠ Safety Warning: The relay's output terminals can carry lethal mains voltage (120–240V AC). Always disconnect power before wiring the high-voltage side. This module is intended for use by persons with appropriate electrical knowledge. Keep away from children.
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