Installing Your Shelly 1 Mini Gen3

Advanced 20-30 minutes

What You'll Need

  • Shelly 1 Mini Gen3
  • Switched lighting or appliance circuit
  • Smartphone with Shelly app
  • 2.4GHz Wi-Fi network
  • Wire connectors
  • Screwdriver
  • Voltage tester

Step-by-Step Setup

  1. Turn off power: Switch off the circuit breaker for the circuit you're working on. Verify with a voltage tester.
  2. Identify wiring: Locate the line (hot), neutral, and switched wire in your junction box or switch location.
  3. Wire the Shelly 1 Mini:
    • L (Line) → Hot wire from panel
    • N (Neutral) → Neutral wire
    • O (Output) → Wire going to the load (light/device)
    • SW (Switch) → Connect to existing wall switch if keeping manual control
  4. Fit in junction box: The Mini Gen3's compact size fits behind most switches and outlets.
  5. Restore power: Turn the circuit breaker back on. The Shelly will create a Wi-Fi access point.
  6. Download Shelly app: Install and create a Shelly Cloud account.
  7. Add the device: The app will discover the Shelly on your network, or tap "+" to add manually.
  8. Connect to Wi-Fi: Configure the Shelly to join your home Wi-Fi network.
  9. Configure button mode: Set how the physical switch operates (toggle, momentary, edge, detached).

Key Features

  • Ultra-compact size (fits behind switch)
  • 8A relay capacity
  • Wi-Fi and Bluetooth connectivity
  • Works with existing switches
  • Local control (no cloud required)
  • MQTT, REST API, Webhooks support
  • Works with Alexa, Google, HomeKit (via third-party)
  • Scripting capability

Troubleshooting

  • Shelly not creating access point: Ensure power connections are correct. Check that L and N have proper voltage. Hold button for 10 seconds to factory reset.
  • Switch not controlling the light: Verify SW terminal is connected to the wall switch. Configure button type in app settings.
  • Wi-Fi disconnects: Check signal strength. The Shelly's position inside the wall can reduce Wi-Fi range. Add Wi-Fi extender if needed.
  • Relay clicking but light not working: The relay is working—check the load wiring. Verify the output wire is connected to the correct circuit.
  • Overheating: Ensure load doesn't exceed 8A. Provide ventilation in the junction box. Don't overload the relay.