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Shelly 1 12V Smart Relay Switch User Guide

Quick guide for the Shelly 1 12V smart relay switch, covering installation wiring diagrams, technical specifications, safety precautions, and device configuration.

Table of contents

Quick guide from the manual

The Shelly 1 12V is a smart relay switch designed to control electrical appliances. This guide provides essential information for safe installation and operation. Always ensure the power is disconnected before performing any wiring. The device must be installed in a wall box or similar enclosure that meets local safety standards.

Device Description

The Shelly 1 12V allows for remote control of electrical appliances via Wi-Fi. It features an embedded web interface for configuration and can be integrated into home automation systems. It supports various power supply voltages, including 110-240V AC, 24-48V DC, and 12V DC.

Installation and Wiring

Installation must be performed by a qualified electrician. Ensure that the device is connected according to the provided diagrams:

  • 110-240V AC: Connect L to the live wire, N to the neutral wire, and the switch to the SW terminal.
  • 24-48V DC: Connect the positive terminal to the + input and the negative to the GND terminal.
  • 12V DC: Connect the 12V+ source to the 12V+ terminal and the ground to the GND terminal.

Always use solid single-core wires or stranded wires with ferrules. The wires should have insulation with increased heat resistance, not less than PVC T105°C.

First Setup

Once powered, the device creates its own Wi-Fi access point. You can connect to it using a smartphone or computer to access the web interface at 192.168.33.1. From there, you can configure the device to connect to your local Wi-Fi network or integrate it with the Shelly Cloud app for remote control.

Safety and Maintenance

Do not expose the device to moisture or liquids. Keep the device away from children. Do not attempt to repair the device yourself. If the device is damaged, disconnect it from the power supply immediately.

Technical Specifications

  • Power Supply: 110-240V AC, 24-48V DC, or 12V DC.
  • Max Load: 16A (240V AC) or 10A (30V DC).
  • Wi-Fi: 802.11 b/g/n (2.4 GHz).
  • Operating Temperature: -20°C to 40°C.
  • Dimensions: 37 x 42 x 16 mm.

Practical help

Common problems

Device not connecting to Wi-Fi

Ensure the device is in Access Point mode (LED blinking) and check your local Wi-Fi credentials in the web interface.

Device unresponsive

Check all wiring connections and ensure the power supply voltage matches the device requirements.

Before use

  • Ensure power is disconnected before wiring.
  • Use wires with heat resistance of at least 105°C.
  • Verify the power supply voltage (110-240V AC, 24-48V DC, or 12V DC).
  • Ensure the installation box meets local safety standards.
  • Have a smartphone or computer ready for Wi-Fi configuration.

Specs in practice

Max Load 16A
The maximum current the relay can switch for AC loads.
Operating Temperature
The device must be used in environments between -20°C and 40°C.
Wi-Fi 2.4 GHz
The device only supports 2.4 GHz Wi-Fi networks, not 5 GHz.

Model compatibility

  • Compatible with Android and iOS via Shelly Cloud app.
  • Supports MQTT and REST API for home automation integration.

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Manual page author

David Miller

Documentation analyst

Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.