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Shelly 2.5

Device identification

  • Device name: Shelly 2.5

  • Device model: SHSW-25

  • Device SSID: shellyswitch25-XXXXXX

Short description

Shelly 2.5 is a small form factor 2-channel smart switch with power measurement and cover control, which allows remote control of electric appliances through a mobile phone, tablet, PC, or home automation system. It can work standalone in a local Wi-Fi network or it can also be operated through cloud home automation services.

Shelly 2.5 can be accessed, controlled and monitored remotely from any place where the User has internet connectivity, as long as the device is connected to a Wi-Fi router and the Internet.

It can be retrofitted into standard electrical wall boxes, behind power sockets and light switches or other places with limited space.

Shelly 2.5 has an embedded Web Interface which can be used to monitor and control the device, as well as adjust its settings.

Main applications

  • Residential

  • MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)

  • Light commercial (small office buildings, small retail/restaurant/gas station, etc.)

  • Government/municipal

  • University/college


  • Google

  • Samsung SmartThings

  • Alexa

Simplified internal schematics

Shelly 2.5 internal schematics

Device electrical interfaces


  • 2 switch/button input on screw terminal

  • 3 power supply inputs on screw terminals: 1 N and 2 L


  • 2 relay outputs with power measurement on screw terminal

Addon interface

  • Shelly proprietary serial interface

Skelly 2.5 addon interface

⚠CAUTION! High voltage on the add-on interface when the Device is powered!


  • Wi-Fi

  • Bluetooth (for inclusion purposes)

Safety features

  • Overheating protection

  • Overvoltage protection

  • Overcurrent protection

  • Overpower protection

  • Obstacle detection (cover mode)

  • Safety switch (cover mode)

Supported load types

  • Resistive (incandescent bulbs, heating devices)

  • Capacitive (capacitor banks, electronic equipment, motor start capacitors)

  • Inductive with RC Snubber (LED light drivers, transformers, fans, refrigerators, air-conditioners)

User interface


  • One (Reset) button

    • Press and hold for 5 seconds to enable Device access point.

    • Press and hold for 10 seconds to factory reset the Device.


  • LED (Red) indication

    • AP (Access Point) enabled and Wi-Fi disabled:
      1 second ON / ¼ second OFF

    • Wi-Fi enabled, but not connected to a Wi-Fi network:
      2 second ON / ¼ seconds OFF

    • Connected to a Wi-Fi network:
      Constantly ON

    • Cloud enabled, but not connected:
      1 second ON /5 seconds OFF

    • Connected to Shelly Cloud:
      Constantly ON

    • OTA (Over the Air Update):
      ½ sec ON / ½ second OFF

    • Button pressed and held for 5 seconds:
      ¼ second ON / ¼ second OFF

    • Button presses and held for 10 seconds:
      ⅛ second ON / ⅛ second OFF

The list above starts with the initial device status and the lowest priority. Every next state cancels the previous one.





Size (HxWxD):

36x39x17 ±0.5 mm / 1.42x1.54x0.67 ±0.02 in



Wall console

Screw terminals max torque:

0.4 Nm / 3.5 lbin

Conductor cross section:

0.5 to 1.5 mm² / 20 to 16 AWG

Conductor stripped length:

5 to 6 mm / 0.20 to 0.24 in

Shell material:





Ambient temperature:

-20 °C to 40 °C / -5 °F to 105 °F


30 % to 70 % RH

Max. altitude

2000 m / 6562 ft


Power supply:

110 - 240 VAC / 30 - 50 VDC

Power consumption:

< 1 W

Output circuits ratings

Max switching voltage AC:

240 V

Max switching voltage DC:

50 V

Max switching current AC:

10 A (per channel), 20 A (total)

Max switching current DC:

10 A (per channel), 20 A (total)

Sensors, meters

Temperature sensor:


Voltmeter (AC)


Ammeter (AC)



RF band:

2401 - 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 and 50 m / 160 ft outdoors
(Depends on local conditions)





2 MB

Firmware capabilities



Webhooks (URL actions):

12 with 5 URLs per hook







Basic wiring diagram

Shelly 2.5 AC wiring

Shelly 2.5 AC wiring

Shelly 2.5 DC wiring

Shelly 2.5 DC wiring

Shelly 2.5 cover control wiring

Shelly 2.5 cover control wiring
a) Detached mode | b) Single button mode | c) Single button and safety switch mode
d) Single switch mode | e) Single switch and safety switch mode
f) Two buttons mode | g) Two switches mode





Neutral terminal


Neutral cable


Live (110-240 V) terminal


Live (110 - 240 VAC) cable

O1, O2

Load circuit output terminals


30 - 50 VDC positive cable

SW1, SW2

Switch input terminals


30 - 50 VDC negative cable



Web Interface guide

Read the Shelly 2.5 web interface guide

Components and APIs

Printed User Guide

Download printed user guide - English, Deutsch, Italiano, Español, Português, Français


Declaration of conformity EN

Installation guides


Home Automation: Roller Shutters, Lights, Scenes

A guide on how to configure and control your roller shutters and ambient of lights, connected to Shelly 2.5, using Amazon Alexa. If you also have a Shelly Door/Window sensor, you can learn how to define a scene to automatically control roller shutters or lights as a function of day time and main door status.

Learn More

Genius Natural Beer Cooler With Wow Effect Controlled With Shelly Smart Device

Create your very own natural beer cooler easily from drain pipes. The beer will be cooled underneath the earth and with an electrically driven motor it comes up if you want some. The genius beer cooler is controlled by a Shelly wifi switch which can be controlled via Siri or Alexa. Just say: “Siri (or Alexa) bring beer”.

Learn More


We Smart

Shelly 2.5 best way to install

Csongor Varga

Shelly 2.5 – dual channel Wi-Fi relay with roller shutter mode

The Hook Up

Does UL Listing Make Products Safer? Interview with Shelly about UL Certification of the Shelly 2.5

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