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Shelly

Shelly 1 Gen4 UL. Smart relay switch, 1 channel 15A, dry contacts. Wi-Fi, Zigbee, Matter

Shelly 1 Gen4 UL. Smart relay switch, 1 channel 15A, dry contacts. Wi-Fi, Zigbee, Matter

1 Gen4 UL

Condition: New

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UL-certified dry-contact smart switch for North American installations. The Shelly 1 Gen4 UL is a compact 1-channel smart relay with potential-free (dry) contacts rated up to 15 A. It adds Wi-Fi 6, Bluetooth, Zigbee and Matter to lights, appliances, gates, garage doors and low-voltage equipment, and fits behind existing switches in standard electrical boxes.

WHY SHELLY 1 GEN4 UL?

Smarter, faster and more connected

Choose the protocol that fits each project - Wi-Fi, Zigbee or Matter - without changing hardware. The dry-contact output switches both line-voltage and low-voltage circuits, so it can drive contactors, garage door openers, gate controllers, doorbells or irrigation valves safely.

The Shelly 1 Gen4 UL runs local schedules, scenes and scripts, works as a Wi-Fi and Zigbee range extender and a Bluetooth gateway for Shelly BLU devices, and integrates with Alexa, Google Home, SmartThings, Apple Home (via Matter), Home Assistant, MQTT and KNXnet/IP. No hub is required for Wi-Fi control.

KEY FEATURES

  • UL Certified
  • 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
  • Dry contacts: potential-free relay output for line- and low-voltage loads, up to 15 A
  • Flexible power: 110-240 V AC, 24-48 V DC or 12 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
  • Range extender & gateway: extends Wi-Fi and Zigbee and bridges Shelly BLU devices
  • Overheating protection: internal temperature sensor
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

  • Lighting Control

    Retrofit behind an existing wall switch to control lights from the app, by schedule or by voice.

  • Garage Door & Gates

    Use the dry contact to trigger garage door openers and gate controllers remotely.

  • Irrigation Valves

    Switch low-voltage irrigation valves or pumps on a schedule or from sensor readings.

  • Fans & Ventilation

    Run bathroom or kitchen fans automatically based on humidity or occupancy.

  • Contactor Control

    Drive a contactor coil to switch heavy loads such as water heaters or pool pumps.

  • Small Business Lighting

    Control lighting zones in offices and shops according to business hours.

Functionalities

  • Multiprotocol Connectivity

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

  • Dry Contacts

    Potential-free relay output to control a wide range of devices, contactors and low-voltage equipment.

  • Low & High Voltage

    Powered from 110-240 V AC, 24-48 V DC or 12 V DC for maximum installation flexibility.

  • Matter Certified

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

  • Smart Schedules

    Set custom schedules based on your agenda or follow sunrise and sunset.

  • Smart Scenes

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

Frequently Asked Questions

What does "dry contact" mean?

The relay output is potential-free: it opens or closes a circuit without supplying voltage, so it can safely switch low-voltage devices, contactors, garage doors and gates.

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.

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.

Does it need a neutral wire?

Yes. It requires a neutral connection when powered from 110-240 V AC; it can also be powered from 24-48 V DC or 12 V DC.

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.

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
Weight26 g / 0.92 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 / Blue
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 / 24-48 V DC / 12 V DC
Power consumption< 1 W
Neutral requiredYes
Output1 potential-free (dry contact) relay
Max. switching current15 A (AC)
Max. switching voltage240 V AC / 30 V DC
Inputs1 switch/button input
CertificationUL
Internal temperature sensorYes (overheating protection)
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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