Shelly 1PM Gen4 16A Smart Review (2026): A Spec-Based Look
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This shelly 1pm gen4 16a smart review covers the Shelly 1PM Gen4 smart relay switch. It is a compact device designed for retrofitting behind wall switches or sockets. The two defining specs are its 16A current rating and its triple connectivity options. You get Wi-Fi, Zigbee, and Matter support in one unit. It also includes Bluetooth for local control and acts as a gateway. The unit measures 1.65 by 1.46 by 0.63 inches. It weighs just 0.92 ounces. This small form factor allows it to fit in tight electrical boxes without bulky external hubs. You can control appliances remotely through the Shelly app or compatible voice assistants.
What stands out
- Supports Wi-Fi, Zigbee, and Matter protocols for broad compatibility
- 16A single-channel relay handles high-load appliances
- Built-in power metering tracks real-time energy consumption
- Functions as a Bluetooth gateway for enhanced connectivity
- Compact dimensions of 1.65 x 1.46 x 0.63 inches for easy installation
Who it fits
Good fit for
This device suits users who want precise power monitoring for high-draw appliances like water heaters or space heaters. The 16A rating makes it suitable for controlling significant electrical loads. If you use multiple smart home ecosystems, the Matter and Zigbee support ensures you can integrate it with Alexa, Google Home, or Home Assistant. The compact size is ideal for retrofitting into existing wall switch boxes. You do not need a separate hub, as it connects directly via Wi-Fi or Bluetooth.
Who should skip it
You should look at another option if you need UL certification, as this listing specifies the Non-UL size variant. The UL version is available separately. If you require a physical display on the device itself, this relay does not have one. It relies on app or voice control. Also, if you prefer a single-pack purchase, this listing is for a 2-pack. You can find single units in other variations, but check the item count carefully before purchasing to ensure you get the right quantity for your needs.
Verdict: The Shelly 1PM Gen4 offers versatile connectivity and power monitoring in a small form factor. It is a solid choice for retrofitting existing switches with smart control.
Shelly 1PM Gen4 Key Specs
Connectivity: Wi-Fi, Zigbee, Matter, Bluetooth
This device supports four distinct wireless protocols. Matter ensures future-proof compatibility with new smart home standards. Wi-Fi and Bluetooth allow direct connection without a separate hub. Zigbee support adds mesh network capabilities for broader coverage. You benefit from flexible integration options. Compare this multi-protocol approach to single-protocol switches that require specific hubs for each function, ensuring you can connect to various platforms easily.
Smart Home Compatibility: Alexa, Google Home, Home Assistant
The switch works with major voice assistants and open-source platforms. Alexa and Google Home allow basic voice control for routine tasks. Home Assistant support appeals to users who prefer local control and advanced automation. You can manage devices through your preferred ecosystem. When shopping, compare this list to devices that only support one platform, ensuring you are not locked into a single brand's ecosystem for your home controls.
Dimensions: 1.65 x 1.46 x 0.63 inches
These compact measurements allow the unit to fit inside standard electrical boxes. The low profile is critical for retrofitting behind wall plates. You can install it in tight spaces without needing larger enclosures. Compare these dimensions to bulkier smart switches that require deep boxes. This size ensures a clean look and easier installation in older homes with shallow wiring cavities.
Weight: 0.92 ounces
The light weight reduces stress on wall switch mounting points. It is easy to handle during installation. You do not need heavy-duty brackets to secure the device. Compare this to heavier smart relays that may require additional support. The minimal weight contributes to a discreet installation that blends into your existing home infrastructure without drawing attention to the hardware.
Design and Build Details
The Shelly 1PM Gen4 is a small relay switch designed for retrofitting behind existing wall switches or sockets. According to the listing, the unit measures 1.65 inches wide, 1.46 inches high, and 0.63 inches deep. This compact form factor allows it to fit into tight electrical boxes where bulkier smart devices might not fit. The weight is listed as 0.92 ounces, making it lightweight and easy to handle during installation. You do not need to replace your entire switch infrastructure. Instead, you can integrate smart control into your current setup with minimal physical changes. The device comes in variations including Non UL and UL sizes, with options for one, two, or four packs. This flexibility lets you choose the right configuration for your specific project needs. The finish and materials are not specified in the provided data, so you should assume standard plastic housing suitable for indoor electrical use. The layout is simple, with a single channel rated for 16 amps. This rating determines the maximum load you can safely connect to the device. You must ensure your appliances do not exceed this current limit to avoid overheating or damage. The compact size also means the device stays hidden once installed, preserving the aesthetic of your home while adding smart functionality. There are no visible buttons or displays on the exterior, as control is handled remotely via the app or voice commands. This minimalist design reduces potential points of failure and keeps the unit discreet. The weight and dimensions are consistent across the variations, ensuring predictable installation results regardless of the pack size you select.
Setup and everyday use guide
The Shelly 1PM Gen4 is designed for a quick installation process that typically takes under ten minutes. You do not need a separate hub to operate this device. It connects directly via Wi-Fi, Bluetooth, or Zigbee. This flexibility allows you to integrate it into your existing network without adding extra hardware. The compact physical dimensions mean it fits behind most standard wall switches or inside electrical sockets. This makes it a practical retrofit option for upgrading older fixtures.
Once installed, you manage the device through the Shelly Smart Control app or compatible platforms like Amazon Alexa, Google Home, and Home Assistant. You can control connected appliances remotely from anywhere with an internet connection. The built-in power metering feature provides real-time data on energy consumption. This allows you to track usage for devices such as water heaters, washing machines, or kitchen electronics. You can identify which appliances draw the most power and adjust their operation accordingly.
Daily use involves creating custom schedules, scenes, and automations. You can set the device to turn on or off at specific times. Voice commands are supported for hands-free control. The device also functions as a Bluetooth gateway, which may enhance connectivity for other nearby devices. With a 16A current rating, it handles standard household loads. The product includes a three-year warranty and professional support options. You can receive real-time notifications through the app to monitor your home’s energy profile and device status.
Before you buy this relay
You should verify your existing switch wiring before installation. This device replaces the existing switch mechanism, so ensure your box can accommodate its 1.65 by 1.46 by 0.63 inch dimensions. Check that your smart home ecosystem supports Matter or Zigbee for the best integration. While it works with Alexa and Google Home, confirm your specific platform handles relay commands correctly. You may need a neutral wire depending on your local electrical code and existing setup. The unit includes a three-year warranty, which provides some peace of mind for long-term use. Consider how this fits into your broader smart home strategy. It complements smart thermostats by managing auxiliary loads like water heaters or fans. If you already use Home Assistant, this device integrates seamlessly. Review your current automations to see if adding power monitoring adds value. You do not need a separate hub, which simplifies the setup process. Ensure your Wi-Fi signal is strong in the switch location for reliable connectivity.
Check before you buy
- Confirm your switch box fits the 1.65 by 1.46 inch dimensions.
- Verify your smart home platform supports Matter or Zigbee protocols.
- Check if your existing wiring requires a neutral connection.
- Ensure your Wi-Fi signal is strong at the switch location.
The product at a glance
Shelly 1PM Gen4 16A Smart Relay
Best for: Energy monitoring and hub-free retrofitting
- Connectivity
- Wi-Fi, Zigbee, Matter, Bluetooth
- Smart Home Compatibility
- Alexa, Google Home, Home Assistant
- Dimensions
- 0.63 × 1.65 × 1.46 inches
- Weight
- 0.92 ounces
View on Amazon: Shelly 1PM Gen4 16A Smart Relay Affiliate link
The Shelly 1PM Gen4 is a compact smart relay switch with real-time power monitoring. It supports Wi-Fi, Zigbee, Matter, and Bluetooth for broad compatibility. The device measures energy use for connected appliances. It fits behind standard wall switches. This unit includes a 16A channel for heavy loads. It works with major voice assistants and home automation platforms.
Pros
- Supports Wi-Fi, Zigbee, and Matter protocols
- Real-time power consumption tracking
- Compact size fits behind wall switches
- 16A single-channel relay capacity
- No external hub required
Cons
- Available in Non-UL or UL versions only
- Single-channel design limits multi-switch control
- Physical dimensions may not fit all backboxes
Good fit if
- You need real-time energy monitoring for specific appliances
- You want a hub-free setup using Matter or Wi-Fi
- You are retrofitting existing wall switch locations
Skip if
- You require UL certification for this specific unit
- You need to control multiple lights from one switch
- You prefer a device with a built-in display
Verdict: Shelly 1PM Gen4 Smart Relay Switch offers precise energy tracking and versatile connectivity for targeted appliance control. It suits users who need detailed power data and flexible protocol support in a small form factor.
Specifications side by side
| Spec | Shelly 1PM Gen4 16A Smart Relay |
|---|---|
| Connectivity | Wi-Fi, Zigbee, Matter, Bluetooth |
| Smart Home Compatibility | Alexa, Google Home, Home Assistant |
| Dimensions | 0.63 × 1.65 × 1.46 inches |
| Weight | 0.92 ounces |
| Size | Non UL |
| Model | 3800238070717 |
Frequently asked questions
Can the Shelly 1PM Gen4 monitor energy usage?
Yes, it provides precise energy tracking. The device is designed to offer detailed power data for targeted appliance control. You can monitor consumption directly through the interface without needing additional sensors. This feature suits users who need to track specific electrical loads in their home.
Does this relay require a separate hub?
No, it does not require a separate hub. The unit supports direct connection via Wi-Fi and Bluetooth. It also includes Zigbee support for mesh network capabilities. This versatility allows you to integrate it into your existing smart home setup without adding extra hardware.
What is the maximum current rating?
The Shelly 1PM Gen4 has a 16A current rating. This specification allows it to handle higher electrical loads compared to standard switches. You should verify that your connected appliances do not exceed this limit to ensure safe and reliable operation during everyday use.
Is it compatible with Matter?
Yes, it supports the Matter protocol. This ensures future-proof compatibility with new smart home standards. You can use it with various ecosystems that adhere to this open standard. The inclusion of Matter alongside Wi-Fi and Bluetooth provides flexible integration options for your devices.
How small is the device?
It measures 1.65 inches wide, 1.46 inches high, and 0.63 inches deep. This compact form factor allows it to fit behind existing wall switches or sockets. The small size is ideal for retrofitting into standard electrical boxes without requiring significant space modifications.
Can I use it for Zigbee networks?
Yes, it supports Zigbee connectivity. This adds mesh network capabilities for broader coverage within your home. You can leverage this protocol for stable connections in areas with weak Wi-Fi signals. It works alongside Wi-Fi and Bluetooth to provide reliable control options.
What is the weight of the unit?
The device weighs 0.92 ounces. This lightweight design makes it easy to handle during installation. You can mount it securely behind wall plates or in tight spaces without worrying about excessive bulk. The minimal weight complements its small physical dimensions.