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Shelly

Shelly 1PM Gen4 UL. Smart Relay Switch with Power Monitoring & Multi-Protocol Connectivity (Open Box)

Shelly 1PM Gen4 UL. Smart Relay Switch with Power Monitoring & Multi-Protocol Connectivity (Open Box)

1PM Gen4 UL_OB_AN

Condition: Open Box

Professionally inspected and tested by Digital Bay Tech to ensure proper operation and cosmetic condition. Final sale. No returns or exchanges.
Open Box units may include manufacturer warranty when applicable and/or a Digital Bay Tech limited replacement warranty for manufacturing defects.
See warranty details below.

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UL-certified smart relay with real-time power metering. The Shelly 1PM Gen4 UL is a compact 1-channel smart relay rated up to 15 A with a built-in power meter. With Wi-Fi 6, Bluetooth, Zigbee and Matter, it brings energy-aware control to lights, appliances and heating from behind an existing switch.

WHY SHELLY 1PM GEN4 UL?

Know what every circuit consumes

The integrated meter reports voltage, current, power and energy in real time and keeps consumption history for analysis, so you can spot energy-hungry appliances and automate based on actual usage.

The Shelly 1PM Gen4 UL runs local schedules, scenes and scripts, extends Wi-Fi and Zigbee coverage, acts as a Bluetooth gateway for Shelly BLU devices, and integrates with Alexa, Google Home, SmartThings, Apple Home (via Matter), Home Assistant, MQTT and KNXnet/IP. Built-in protections guard against overheating, overvoltage, overcurrent and overpower.

KEY FEATURES

  • UL Certified
  • Power metering: real-time voltage, current, power and energy data
  • Multiprotocol: Wi-Fi 6, Bluetooth 5.0 and Zigbee 3.0 in one device
  • Matter certified: works with Apple Home, Google Home, Alexa and SmartThings through Matter
  • Up to 15 A: UL-certified relay output for lights, appliances and heating
  • Flexible power: 110-240 V AC or 24-30 V DC
  • Retrofit-friendly: fits behind existing switches and sockets
  • Local automation: schedules, scenes, local actions and scripting keep running without internet
  • Open integrations: HTTPS, MQTTS, WebSockets, virtual components and KNXnet/IP
  • Protections: overheating, overvoltage, overcurrent and overpower
View full details

Gen4 devices

Experience next-level smart home automation with Shelly Gen4 novelties.
Each Gen4 device offers multi-protocol connectivity, featuring Wi-Fi, Bluetooth, Zigbee, and Matter.
Choose your connection and set up your Shelly device to work with your preferred smart home network in no time.

Common Use Cases

  • Energy Monitoring

    Track the consumption of water heaters, AC units or appliances circuit by circuit.

  • Lighting Control

    Retrofit behind an existing wall switch and control lights by app, schedule or voice.

  • Heating Control

    Switch electric heaters, towel warmers or floor heating based on schedules or temperature.

  • Overload Alerts

    Get notified or switch off automatically when a load exceeds the power you define.

  • Appliance Automation

    Detect when a washing machine or dryer finishes by its power draw and send an alert.

  • Commercial Spaces

    Automate lighting and equipment in offices and shops while monitoring energy use.

Functionalities

  • Multiprotocol Connectivity

    Choose the best protocol for your smart home: Wi-Fi, Zigbee, Matter or Bluetooth.

  • Power Monitoring

    Precise built-in power meter with real-time consumption data and history.

  • Matter Certified

    Integrates into any Matter ecosystem, including Apple Home, Google Home and Alexa.

  • Wide Voltage Support

    Powered from 110-240 V AC or 24-30 V DC to control a wide range of devices.

  • Smart Schedules

    Create schedules aligned with your daily routine or synchronized with sunrise and sunset.

  • Smart Scenes

    Combine Shelly 1PM Gen4 with your other devices to build scenes and local automations.

Frequently Asked Questions

What does the Shelly 1PM Gen4 UL measure?

It measures voltage, current, power and energy consumption of the connected load in real time and stores consumption history.

Shelly 1PM Gen4 is a smart relay switch designed to control electrical circuits and appliances while providing real-time power and energy monitoring.

Is it UL certified?

Yes. This version is UL-certified for installation in the United States and Canada, with a maximum switching current of 15 A.

No. Shelly 1PM Gen4 can operate directly over Wi-Fi without a hub. Zigbee or Matter integrations may require a compatible controller, depending on your setup.

Does it need a hub?

No hub is needed over Wi-Fi. For Zigbee or Matter you need a compatible Zigbee hub or Matter controller.

Yes. Its compact design makes it ideal for installation behind existing switches or sockets, perfect for retrofit projects.

Does it need a neutral wire?

Yes. A neutral connection is required when powered from 110-240 V AC.

Shelly 1PM Gen4 supports both low- and high-voltage applications and is suitable for controlling lighting, appliances, and heating circuits within its rated specifications.

Will it keep working without internet?

Yes. Schedules, scenes, local actions and scripts run locally on your network, even if the internet connection is down.

Yes. Shelly 1PM Gen4 supports local control and local automations, allowing schedules and actions to keep running on the local network even without internet access.

No hub required, Universally compatible

Shelly Products can be controlled locally, directly and without a hub through your smartphone/table with Shelly App - no hub or other equipment needed with Wi-Fi Protocol.(*)
Enable cloud feature and get remote control from anywhere. At the same time, you can integrate Shelly directly with virtually every smart home hub, voice assistant, open source platform, or premium control system.

(*) Platform app / Hub required when used with Zigbee / Matter

Shelly App
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms Shelly compatible platforms

No hub required, Universally compatible

Shelly Products can be controlled locally, directly and without a hub through your smartphone/table with Shelly App - no hub or other equipment needed with Wi-Fi Protocol.(*)
Enable cloud feature and get remote control from anywhere. At the same time, you can integrate Shelly directly with virtually every smart home hub, voice assistant, open source platform, or premium control system.

(*) Platform app / Hub required when used with Zigbee / Matter

Shelly App
Shelly compatible platforms
Shelly compatible platforms
Shelly compatible platforms
Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Shelly compatible platforms Shelly compatible platforms
Specifications

PHYSICAL
Size (HxWxD)37 x 42 x 16 mm / 1.46 x 1.65 x 0.63 in
Weight27 g / 0.95 oz
MountingIn-wall (electrical box)
Conductor cross section0.5 to 4 mm² / 20 to 11 AWG
Conductor stripped length6 to 7 mm / 0.24 to 0.28 in
Screw terminals max. torque0.4 Nm / 3.5 lbin
Shell material / colorPlastic / Red
ENVIRONMENTAL
Ambient working temperature-20°C to 40°C / -5°F to 105°F
Humidity30% to 70% RH
Max. altitude2000 m / 6562 ft
ELECTRICAL
Power supply110-240 V AC / 24-30 V DC
Power consumption< 1 W
Neutral requiredYes
Output1 relay output with power measurement
Max. switching current15 A (AC)
Max. switching voltage240 V AC / 30 V DC
Inputs1 switch/button input
MeteringVoltage, current, power, energy
ProtectionsOverheating, overvoltage, overcurrent, overpower
Add-on interfaceShelly proprietary serial interface
CertificationUL
RADIO
Wi-Fi802.11 b/g/n/ax (Wi-Fi 6), 2.4 GHz; up to 30 m / 100 ft indoors, 50 m / 160 ft outdoors
Bluetooth5.0 (LE); up to 10 m / 33 ft indoors, 30 m / 100 ft outdoors
Zigbee3.0 (802.15.4), repeater; up to 100 m / 328 ft indoors, 300 m / 984 ft outdoors
MatterYes (over Wi-Fi, default profile)
MICROCONTROLLER & FIRMWARE
CPU / FlashESP-Shelly-C68F / 8 MB
Schedules20
Webhooks (URL actions)20 with 5 URLs per hook
Scripting / MQTT / KNXnet/IPYes / Yes / Yes

Warranty

New Products

  • USA Pro Market Manufacturer Warranty: Lifetime manufacturer warranty (only if installed by a professional within USA) when purchased at Digital Bay Tech.

  • Retail Standard Manufacturer Warranty (included in purchase price): 2, 3 or 5 years manufacturer warranty covers only the hardware (corpus, mechanics, and display, if any) and does not cover consumables (battery) and accessories insofar as these are subject to exhaustion (decrease of their useful life) depending on the intensity of their use. Device malfunctions are only covered when device is used as described conditions within user manual (max loads, proper installation, etc.). Please check refund policy for further details.
  • Gen 1: 2 years.
  • Plus, Gen3, Gen4, Wave: 3 years.
  • Pro Line: 5 years.

Special Notes

  • Do It Yourself: Devices are technically user-installable in many locales, nevertheless consulting a licensed electrician to install shelly components is recommended; in addition to being licensed to work with electrical devices, they are also familiar with local building codes and regulations to keep your safety.
  • Manufacturer's Safety note: Each Shelly device generates heat under load. Do not combine two or more Shelly devices stacked on top of or beside each other in a confined space. There must be a minimum distance of 0.4 inch / 1 cm between them to allow for airflow.

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