Smart Home / Smart Switches
User Guide for Shelly Pro 2 DIN Mountable 2-Circuit Wi-Fi Smart Relay
Comprehensive user guide for the Shelly Pro 2 smart relay. Includes installation instructions, wiring diagrams, LED status indicators, safety warnings, and technical specifications.
Quick answers from the manual
Quick answer
- The Shelly Pro 2 is a DIN-mountable 2-circuit smart relay for remote control of electric circuits via Wi-Fi, LAN, or Bluetooth. p. 1
Key actions
- Reset to factory settings p. 1
- Enter AP mode p. 1
Problems and fixes
Inductive load causing issues
Install an RC snubber in parallel to the appliance.
p. 1Maintenance and reset
- Factory reset p. 1
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Dimensions | 68.5x18.5x89.5 mm | Physical size for DIN rail mounting | p. 1 |
Where to find it in the PDF
- Installation and Wiring p. 1
Table of contents
Quick Guide
The Shelly Pro 2 is a DIN-mountable, 2-circuit smart relay designed for remote control of electrical appliances via Wi-Fi, LAN, or Bluetooth. It is suitable for homes, offices, and retail stores. Before installation, ensure the power is disconnected at the breaker and verify the absence of voltage using a multimeter.
Installation
Warning: Installation must be performed by a qualified electrician. Ensure the device is not installed in a location where it may get wet.
- Wiring: Connect the Neutral (N) cable to the N terminal and the Live (L) cable to the device power supply circuit breaker. Connect load circuit 1 to O1 and the Neutral cable, and load circuit 2 to O2 and the Neutral cable. Connect the switch inputs to S1 and S2.
- Inductive Loads: For appliances like motors, fans, or vacuum cleaners that cause voltage spikes, install an RC snubber (0.1µF / 100 Ω / 1/2 W / 600 VAC) in parallel to the appliance.
- Clearance: Allow at least 10 mm of space around each Pro device if you expect currents higher than 5 A per channel.
LED Indicators
- Power (Red): On if power supply is connected.
- Wi-Fi: Blue (AP mode), Red (STA mode, not connected), Yellow (STA mode, connected to Wi-Fi but not Shelly Cloud), Green (STA mode, connected to Wi-Fi and Shelly Cloud). Flashing Red/Blue indicates an OTA update.
- LAN (Green): On if LAN is connected.
- Out (Red): On if the output relay is closed.
Reset Procedure
- AP Mode: Press and hold the reset button for 5 seconds.
- Factory Reset: Press and hold the reset button for 10 seconds.
Technical Specifications
- Power Supply: 110 - 240 VAC, 50/60Hz
- Max Switching Current: 16 A per channel, 25 A total for both channels
- Dimensions: 68.5 x 18.5 x 89.5 mm
- Operating Temperature: -20°C to 40°C
- Connectivity: Wi-Fi 802.11 b/g/n, Bluetooth v4.2, LAN
Safety Warnings
Do not exceed the maximum load indicated. Use the device only with a power grid and appliances that comply with all applicable regulations. A short circuit in the power grid or any appliance connected to the device may damage the device.
Practical help
Common problems
Device not connecting to Wi-Fi
Ensure the device is in STA mode (yellow or green light). If the light is red, it is not connected to a Wi-Fi network.
Voltage spikes with inductive loads
Install an RC snubber (0.1µF / 100 Ω / 1/2 W / 600 VAC) in parallel to the appliance.
Before use
- Ensure power is turned off at the breaker.
- Verify no voltage at terminals using a multimeter.
- Use solid single-core cables with increased insulation heat resistance (PVC T105°C).
- Ensure space of at least 10 mm around the device if current > 5A per channel.
Specs in practice
- Max switching current
- 16 A per channel, 25 A total for both channels.
- Power supply
- 110-240 VAC, 50/60Hz.
Model compatibility
- Compatible with Amazon Alexa and Google Home.
- Requires 2.4 GHz Wi-Fi network.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.