Shelly Plus Wall Dimmer

Device Identification

• Device name: Shelly Plus Wall Dimmer
• Device model: SNDM-0013US
• Device SSID: ShellyPlusWDUS-XXXXXX

Short Description

The Shelly Plus Wall Dimmer (the Device) can switch lights on/off and adjust the brightness of compatible dimmable lighting. It is designed to replace a standard US light switch with simple wiring. Enhanced with full gen2 firmware capabilities, it offers professional integrators advanced options for custom end-user solutions. The device operates standalone within a local Wi-Fi network or integrates seamlessly with cloud-based home automation services.

Users can remotely access, configure, and monitor the Device from anywhere with internet connectivity, provided the device is connected to a Wi-Fi router and the Internet.

The Device includes an embedded Web Interface for local monitoring, control, and configuration of settings.

Features

• Night mode
• Weekly schedules
• Auto on/off timers

Main Applications

• Residential
• MDU (Multi Dwelling Units – apartments, condominiums, hotels, etc.)
• Light commercial (small offices, retail stores, restaurants, gas stations, etc.)
• Government/municipal projects
• University/college facilities

Integrations

• Google Assistant
• Amazon Alexa
• Samsung SmartThings

Simplified Internal Schematics

Device Electrical Interfaces

Inputs

• 2 line wires:
  • Black L (Live)
  • White N (Neutral)
• 1 green ⏚ (Ground) wire

Output

• 1 red OUT wire (connected to the load/light fixture)

Connectivity

• Wi-Fi (802.11 b/g/n)
• Bluetooth 4.2

Supported Load Types

• Incandescent lights
• Dimmable-only LED lights
• Dimmable-only CFLs

User Interface

Inputs

• One power button with LED indication:

  • Press once: Turn lights on/off.
  • Press and hold for 5 seconds: Activate Device Access Point (AP).
  • Press and hold for 10 seconds: Factory reset the Device.

• One slider with brightness LED indication:

  • Slide up: Increase brightness.
  • Slide down: Decrease brightness.

Outputs

• Power Button LED Indication:

  • Blue Wi-Fi LED*:

    • AP enabled, Wi-Fi disabled: Blue light flashing (1 sec ON / 1 sec OFF)¹
    • Wi-Fi enabled, not connected: Blue light flashing slowly (1 sec ON / 3 sec OFF)²
    • Wi-Fi connected, Cloud disabled or connected: Steady blue light
    • Wi-Fi connected, Cloud enabled but not connected: Blue light flashing very slowly (1 sec ON / 5 sec OFF)³
    • Power button held for 5 sec: Blue light flashing quickly (⅕ sec ON / ½ sec OFF)⁴
    • Power button held for 10 sec: Blue light flashing very quickly (⅕ sec ON / ⅕ sec OFF)⁵
    • OTA update in progress: Blue light flashing quickly (⅕ sec ON / ½ sec OFF)⁴

  • White Power LED** (illuminated when lights are on):

    • AP enabled, Wi-Fi disabled: White light flashing (1 sec ON / 1 sec OFF)¹
    • Wi-Fi enabled, not connected: White light flashing slowly (1 sec ON / 3 sec OFF)²
    • Wi-Fi connected, Cloud disabled or connected: Steady white light
    • Wi-Fi connected, Cloud enabled but not connected: White light flashing very slowly (1 sec ON / 5 sec OFF)³
    • Power button held for 5 sec: White light flashing quickly (⅕ sec ON / ½ sec OFF)⁴
    • Power button held for 10 sec: White light flashing very quickly (⅕ sec ON / ⅕ sec OFF)⁵
    • OTA update in progress: White light flashing quickly (⅕ sec ON / ½ sec OFF)⁴

• Brightness LED Indication:

  • A single white dot is lit when lights are off.
  • When lights are on, a vertical bar of white dots illuminates:
    • Each lit dot represents a 14% increase in brightness (84–100% at the top dot).

* Blue Wi-Fi LED can be enabled (default) or disabled via settings.
** White Power LED can be configured by the user to: match output (default), invert output, stay always ON, or stay always OFF.

Note on flash patterns:
¹ 1 second ON / 1 second OFF
² 1 second ON / 3 seconds OFF
³ 1 second ON / 5 seconds OFF
⁴ ⅕ second ON / ½ second OFF
⁵ ⅕ second ON / ⅕ second OFF

Specifications

Category	Specification
Physical
Size without face plate and wires (HxWxD)	104 × 44 × 39 ±0.5 mm / 4.09 × 1.73 × 1.50 ±0.02 in
Size with face plate and without wires (HxWxD)	120 × 70 × 39 ±0.5 mm / 4.72 × 2.76 × 1.50 ±0.02 in
Weight without face plate	105 g / 3.70 oz
Weight with face plate	121 g / 4.28 oz
Shell material	ABS
Color	White
Environmental
Ambient temperature	-20 °C to 40 °C / -5 °F to 105 °F
Humidity	30% to 70% RH
Electrical
Power supply voltage AC	100 – 120 V, 50/60 Hz
Power supply voltage DC	N/A
Power consumption	< 3 W
Output Circuit Ratings
Max load power at 120 VAC
Incandescent lights	400 W
Dimmable-only LED/CFL	150 W
Radio
RF band	2400 – 2495 MHz
Max RF power	< 20 dBm
Wi-Fi protocol	802.11 b/g/n
Wi-Fi range	Up to 30 m (100 ft) indoors, up to 50 m (160 ft) outdoors (depends on local conditions)
Bluetooth protocol	4.2
Bluetooth range	Up to 10 m (33 ft) indoors, up to 30 m (100 ft) outdoors (depends on local conditions)
MCU
CPU	ESP32
Flash memory	4 MB
Firmware Capabilities
Webhooks (URL actions)	20 hooks, up to 5 URLs per hook
Scripting	Yes
MQTT	Yes
CoAP	No

Wiring Diagram

Troubleshooting

(Content pending)

Components and APIs

• This device
• All Shelly devices and services

Printed User Guide

Shelly Plus Wall Dimmer Multilingual Printed User and Safety Guide.pdf

Installation Guides

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