Zooz 700 Series Z-Wave Long Range Dry Contact Relay ZEN51 LR

$26.95 $32.95

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Z-Wave Frequency & Product Condition (See full condition details below)

Backstage Z-Wave


  • On/off Z-Wave control for 120V and dry contact applications: great for lighting control or 120V load monitoring (sump pumps, motion lights)
  • 700 series Z-Wave chip: greater coverage for a stronger mesh network
  • Long Range: if your hub implements Z-Wave Long Range, you'll benefit from the latest direct device-to-hub communication which extends the range like never before and eliminates network lags (note that versions for regions outside of US/CA/MX don't come with LR)
  • SmartStart and S2 authenticated security for a truly protected smart home
  • Installs behind the existing wall switch or at the fixture (if neutral is not available in the switch box)
  • Pigtail wires included for hassle-free set-up
  • Perfect if you'd like to leave your favorite wall switch style or color but add Z-Wave to it
  • Smart bulb mode: disable manual and/or Z-Wave control to control your smart bulbs via Z-Wave only without cutting power to them
  • Scene control: choose from 7 multi-tap triggers to expand the functionality of the connected switch (available on hubs that support multi-tap triggers*)
  • Multicolor LED indicator for easier pairing and diagnostics
  • Compatible with quality LED and incandescent bulbs (don't connect to ballast tube lights, switched receptacles, or fans over 3A / 5 years old; NOTE: FEIT bulbs are not recommended)
  • Built-in signal repeater: helps keep your network quick and reliable
  • 5-year warranty and lifetime tech support

    NOTE: Z-Wave gateway controller required - sold separately. *Your smart hub / controller needs to support advanced settings and central scene programming for you to take advantage of this feature.


    We may have this product available in open box, refurbished, or used condition - just check the variant buttons under the product price for availability. All of our recycled inventory has been tested for both manual and Z-Wave control and is fully functional at the time of shipment. Here is what you can expect when ordering your device:

    • NEW: brand new product, as delivered by the factory
    • OPEN BOX: like new item in excellent condition, it may come in partially damaged or not original packaging; all accessories included; hardware and firmware version may be different than the brand new device description, may not feature Z-Wave Long Range.
    • REFURBISHED: good condition, may show slight signs of wear, may not include all accessories (like product manual, battery may not be full, etc); hardware and firmware version may be different than the brand new device description, may not feature Z-Wave Long Range.
    • USED (FINAL SALE): used condition, may show signs of wear, may not include accessories (like product manual, batteries, or mounting hardware) or parts of the packaging; may show signs of wear like scratches; FINAL SALE: not eligible for return, replacement, or warranty service; hardware and firmware version may be different than the brand new device description, may not feature Z-Wave Long Range.


    This product is available in different Z-Wave frequencies so please make sure you choose the correct region before checking out. You need to select the same frequency / region as your hub when buying Z-Wave devices for them to include to your system. If you're not sure which frequency your hub operates on, please contact your solution provider first. Here is what each option stands for:

    • US/CA/MX: 908.42 MHz (used primarily in US, Canada, and Mexico, the default option for all products)
    • EU/UK: 868.42 MHz (used primarily in Europe) - no Z-Wave Long Range


    Before installing, make sure the load does not exceed 960W for incandescent lights, 150W for LED's, 3A for fans and motors, or 10A for resistive load. Check your wiring first to confirm that you have all the following wires present in your gang box: load (most often black), line (most often black), neutral (most often white), and ground (most often green).

    If you are not comfortable identifying the wiring and following the instructions, please hire a licensed electrician.

    Zooz 700 Series Z-Wave Plus Dry Contact Relay ZEN51 Single Pole Wiring Diagram

    Here are some helpful wiring tips:

      • Make sure the gang box you are about to install the switch has a neutral wire available - you will not be able to get the ZEN51 relay to work without a neutral wire. If neutral is not available, you'll need to install the ZEN51 at the light fixture.
      • Unlike regular mechanical switches, Z-Wave switches require all of the wires to be connected exactly as indicated - line and load wires can never be swapped as it sometimes happens to the most experienced electricians.

    How to include the Dry Contact Relay to your smart home network?
    1. Bring your Z-Wave gateway hub or controller as close to the switch as possible
    2. Put your Z-Wave controller in inclusion/pairing mode
    3. Click the Z-Wave button on the relay 3 times quickly to finalize the inclusion process
    4. A new on/off switch should appear on your controller's device list


    NOTE: If you don't see your Z-Wave controller on the list above, please contact us before you purchase this product.


    • Z-Wave Region: US/CA/MX, EU/UK (no Z-Wave Long Range)
    • Power: 120-240 VAC, 50/60 Hz
    • Maximum Loads: 960W incandescent, 150W LED bulbs, 10A resistive, 1/2 HP fan motors
    • Z-Wave Range: Up to 300 feet line of sight (up to 1300 feet with Z-Wave Long Range)
    • Dimensions: 1.5" tall, 1.4" wide, 0.7" deep
    • Operating Temperature: 32-104° F (0-40° C)
    • Installation: Indoor use only


      Download the Manual for Zooz 700 Series Z-Wave Plus Dry Contact Relay ZEN51 (PDF)

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      Customer Reviews

      Based on 22 reviews
      Chuck Masters
      Keep your switch

      I love that I can keep my current light switch and still have automation with this dry contact relay.

      H K
      Works great, perfect price point!

      I use this device in combination with ZSE18 800LR motion sensor to add automation to my closet and office space lighting combined with Home Assistant. It was super simple to setup and easy to automate!

      Lucas S
      A very useful device

      Since this is small and a dry contact relay I am finding many uses for this device, I have one installed on a switch to a motion control light so I can operate the light while not home if needed to be turned on for longer periods. The standard smart switches to not work with motion control lights due to electronic incompatibilities but a dry contact relay works great. I put a few on the common of some sprinkler control boxes so that i can use weather data via my hub to disconnect the valves if it is raining. I have many other plans for these and I am very impressed with the distance they will operate at.

      Kamil Jopek
      Great product

      Everything works as expected

      Awesome products and store!

      Love the Zooz products. Most of my smart house is Zooz ( over 70 devices). But for smartest house… had an address that got black listed (I never received an order and asked for a refund) and cannot order to that address. They won’t even return a call or email. Summary products great. Quick delivery.