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Axiometa

Relay (3A)

Relay (3A)

AX22-0014

$4.49
$4.49
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This AX22-sized board drops a Hongfa HK4100F-DC3V-SHG mechanical relay onto a 22 × 22 mm PCB, letting you switch mains-level or high-current loads with a single microcontroller pin. An onboard N-channel transistor driver, fly-back diode, and status LED handle the 3 V coil’s ~90 mA draw and protect your logic lines. Snap it into any AX22 backplane to add power-isolation, actuator control, or hard-off safety to projects coded in Arduino, MicroPython, or MicroBlocks—no extra wiring, no headaches.

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  • Technical Details

    - 22 mm × 22 mm square
    - 4× ⌀2.7 mm Mounting Holes
    - 3 A @ 125 VAC
    - 3 A @ 30 VDC
    - 3 V coil, ≈ 90 mA pull-in, 178 mW
    - 3.3 V, 5.0 V
    - Arduino IDE Compatible
    - MicroPython Compatible
    - MicroBlocks Compatible

  • Pinout

  • Compatibility

PCB Design

  • Top

  • Bottom

Arduino Example Code

example.ino 
const int relayPin = 15;

void setup() {
  pinMode(relayPin, OUTPUT);
}


void loop() {
  digitalWrite(relayPin, HIGH);  // turn the Relay on
  delay(1000);                   // wait for a second
  digitalWrite(relayPin, LOW);   // turn the Relay on
  delay(1000);                   // wait for a second
}

Guides and Blogs

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