Shelly Plus 1 UL Relay Review: Specs, Pros and Cons
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
This shelly plus 1 ul review focuses on a compact smart relay switch designed for straightforward home automation. The device connects via Wi-Fi and Bluetooth, allowing you to control electrical loads without a separate hub. It features a 15A maximum load rating and potential-free dry contacts, which provide flexibility for various voltage types. Its small form factor allows it to fit behind standard wall plates. You can use it to automate appliances, garage doors, or lighting. The unit supports MQTT and TLS for secure communication. This setup is ideal for users who want to retrofit existing switches with minimal wiring changes while maintaining reliable remote control capabilities.
What stands out
- 15A maximum load capacity for high-power devices
- Potential-free dry contacts for flexible voltage support
- No hub required; connects directly via Wi-Fi
- Compact size fits behind standard wall switches
- Supports Bluetooth for local gateway functionality
Who it fits
Good fit for
You should choose this relay if you need to automate high-current devices like garage door openers, pool pumps, or electric heaters. The 15A rating handles significant loads. The dry contacts are useful for interfacing with older equipment that requires potential-free outputs. If you prefer a no-hub solution and want to retrofit existing mechanical switches with smart control, this unit fits the bill. It works well with Alexa and Google Home for voice control. The compact design is perfect for tight electrical boxes behind wall plates.
Who should skip it
Skip this option if you need to control multiple independent circuits from a single device, as this unit only offers one channel. It is not suitable for low-voltage lighting systems that require dimming capabilities, as it is a simple relay switch. If you require a display for local status viewing, this device lacks one. You might also look elsewhere if you need Zigbee or Z-Wave connectivity, as this model relies on Wi-Fi and Bluetooth. It is not designed for complex multi-way switching setups without additional relays.
Verdict: The Shelly Plus 1 UL Relay Switch is a practical, hub-free solution for automating single high-load circuits. Its dry contacts and compact design make it a versatile choice for retrofitting existing electrical infrastructure.
Key specs explained
Connectivity: Wi-Fi, Bluetooth
This device uses Wi-Fi for local network communication and Bluetooth for direct pairing. You can connect it to your home network without a separate hub. Bluetooth allows for initial setup and local control even if the internet is down. This dual approach offers flexibility for installation in areas with varying signal strength or network availability.
Maximum Load: 15A
The relay can handle a maximum current of 15 amps. This rating determines the power capacity of the appliances you can control. You can use it for standard lighting circuits or moderate loads. Do not exceed this limit to avoid overheating or damaging the unit. Compare this to other relays to ensure it matches the amperage of your specific electrical devices.
Hub Requirement: No Hub Required
You do not need to purchase a separate smart home hub to operate this device. It connects directly to your existing Wi-Fi network. This simplifies your setup by reducing the number of components in your smart home ecosystem. It is ideal for users who want to add automation without expanding their hardware inventory or managing additional bridge devices.
Switch Function: Relay Switch
This is a relay switch, meaning it acts as an electrical switch to turn power on or off. It does not dim lights or vary speed. Instead, it provides a simple on/off state for connected devices. You can use it to control fans, heaters, or garage doors. This function is distinct from smart bulbs or dimmer switches that offer variable control.
Smart Home Compatibility: Alexa, Google Home, SmartThings
The device works with major voice assistants and platforms like Alexa, Google Home, and SmartThings. You can control it using voice commands or integrate it into broader automation routines. This compatibility ensures you can add it to your existing smart home setup without being locked into a single ecosystem. Check your current platform to ensure seamless integration and remote access.
Compact size and simple layout
The Shelly Plus 1 UL Relay Switch measures 1.65 inches in length, 1.46 inches in width, and 0.63 inches in height. It weighs 0.96 ounces. According to the listing, this small footprint allows the device to fit behind standard wall switches or wall sockets. You do not need to run additional cables or perform expensive renovations to install it. The compact design ensures it remains hidden within your existing electrical box.
The unit is described as blue in color and comes in a 1-pack size. It functions as a relay switch with a single channel. The listing notes that it supports potential-free outputs, known as dry contacts. This feature provides high flexibility for various voltage supports and applications. You can use it to control home appliances, garage doors, irrigation systems, or office equipment individually.
Installation is described as safe and easy, taking less than ten minutes. The device does not require a separate hub for operation. It connects via Wi-Fi and Bluetooth. This connectivity allows you to automate electrical appliances remotely. You can control even older devices like room heaters or pool systems with a click or voice command. The physical design prioritizes discreet integration into your home’s existing wiring infrastructure without adding bulk or visual clutter.
Setup and everyday use
You can install the Shelly Plus 1 UL in less than ten minutes. Its compact dimensions allow it to fit behind standard wall switches or sockets. The device requires no additional hub. You connect it directly to your Wi-Fi network. Bluetooth assists with initial pairing and local control. This setup process avoids running new cables or performing expensive renovations. Once installed, you use the Shelly Smart Control app to manage the device. The app lets you configure settings individually or create scenes that trigger specific actions. You can control the relay remotely or via voice commands through Alexa, Google Home, or SmartThings. The relay supports a maximum load of 15A. It features potential-free dry contacts. This output type provides flexibility for various voltage supports. You can use it to automate appliances, garage doors, irrigation systems, or door locks. The device also functions as a Wi-Fi repeater and Bluetooth gateway. Enhanced security features include MQTT, WSS support, and TLS. You receive notifications for all automated events through the app. The listing notes a three-year device warranty from Shelly. This relay allows you to make older electrical equipment smart without replacing the hardware. You control circuits individually through the interface. The system is designed for straightforward home automation tasks.
Before you buy the Shelly Plus 1
You need a compatible smart home ecosystem before installing this relay. The listing confirms support for Alexa, Google Home, and SmartThings. Verify your specific hub or voice assistant supports Shelly devices. This unit lacks a built-in thermostat, so it does not replace your heating or cooling controls. It functions as a switch for appliances, fans, or garage doors. You must ensure your electrical load stays under 15A. Check if your wiring supports the neutral wire required for Wi-Fi stability. The device uses TLS and MQTT for security, which may require technical knowledge to configure fully. It fits well alongside smart thermostats in a broader automation setup. You can use it to control secondary circuits while your main thermostat handles primary climate control. Consider whether you need a hub for other devices, as this unit connects directly to Wi-Fi. Ensure your home network supports the 2.4GHz band required for reliable operation.
Check before you buy
- Verify your electrical load does not exceed 15A.
- Confirm your smart home hub supports Shelly devices.
- Check if your wiring includes a neutral wire.
- Ensure your Wi-Fi network supports 2.4GHz connections.
The product at a glance
Shelly Plus 1 UL Relay Switch
Best for: single-circuit automation with dry contacts
- Smart Home Compatibility
- Alexa, SmartThings, Google Home
- Hub Requirement
- No Hub Required
- Connectivity
- Wi-Fi, Bluetooth
- Switch Function
- Relay Switch
- Maximum Load
- 15A
- Dimensions
- 1.65 × 1.46 × 0.63 inches
View on Amazon: Shelly Plus 1 UL Relay Switch Affiliate link
The Shelly Plus 1 UL is a Wi-Fi smart relay switch rated for up to 15A. It features potential-free dry contacts for flexible voltage support and acts as a Bluetooth gateway. The compact unit fits behind wall switches and requires no hub. It integrates with Alexa, Google Home, and SmartThings for remote control via the Shelly app.
Pros
- UL-certified safety for home installations
- Potential-free dry contacts for versatile load types
- Built-in Bluetooth gateway and Wi-Fi repeater
- No hub required for setup
- Compact dimensions fit behind standard wall plates
Cons
- Single channel limits multi-zone control
- No local display for manual status checks
- Requires Wi-Fi network for remote operation
Good fit if
- You need to automate a single high-load circuit
- You want to retrofit existing wall switches
- You require dry contacts for specific appliances
Skip if
- You need to control multiple independent loads
- You prefer a device with a built-in screen
- You require Zigbee or Z-Wave connectivity
Verdict: The Shelly Plus 1 UL Smart Relay offers a UL-certified, single-channel solution for automating specific circuits with dry contacts. It suits users who need a compact, hub-free relay that integrates with major smart home platforms.
Specifications side by side
| Spec | Shelly Plus 1 UL Relay Switch |
|---|---|
| Smart Home Compatibility | Alexa, SmartThings, Google Home |
| Hub Requirement | No Hub Required |
| Connectivity | Wi-Fi, Bluetooth |
| Switch Function | Relay Switch |
| Maximum Load | 15A |
| Dimensions | 1.65 × 1.46 × 0.63 inches |
| Weight | 0.96 ounces |
| Size | 1 Pack |
| Color | Blue |
| Model | 3800235265529 |
Frequently asked questions
Does the Shelly Plus 1 UL Relay require a hub?
No, this device does not require a hub. You can connect it directly to your home Wi-Fi network for automation. The product data confirms it is hub-free. This simplifies your setup by removing the need for extra hardware. You gain direct control through your local network.
What smart home platforms does this relay support?
The Shelly Plus 1 UL Relay works with Alexa, Google Home, and SmartThings. You can integrate it with these major platforms for voice control and automation routines. The listing explicitly lists these three ecosystems. This allows you to use the device within your existing smart home infrastructure.
How large is the Shelly Plus 1 UL Relay?
The unit measures 1.65 inches in length, 1.46 inches in width, and 0.63 inches in height. It weighs 0.96 ounces. This compact form factor is designed to fit behind standard wall plates. The small size ensures it does not crowd your electrical box during installation.
Can I use this relay with dry contacts?
Yes, the Shelly Plus 1 UL Relay is designed for single-circuit automation using dry contacts. This feature allows you to switch loads without a direct electrical connection to the control circuit. It is ideal for triggering specific devices or circuits. The product data highlights this capability as a key function.
Does the device support Bluetooth connectivity?
Yes, the Shelly Plus 1 UL Relay includes Bluetooth connectivity. You can use Bluetooth for initial pairing and local control. This works even if your internet connection is unavailable. It provides a reliable fallback for managing your device when Wi-Fi is down.
Is the Shelly Plus 1 UL Relay UL certified?
Yes, this model is UL certified. The product name and description confirm its safety certification. This indicates it meets specific safety standards for electrical devices in the United States. You can trust it for standard home automation tasks involving electrical loads.
What is the maximum load rating for this switch?
The device supports a maximum load rating of 15A. You can use it to control electrical loads up to this limit. Exceeding this rating may damage the unit or create a safety hazard. Always verify that your connected appliances stay within this 15A threshold.