--- product_id: 613584245 title: "ZOOZ 700 Series Z-Wave Long Range Smart Relay ZEN51 | Installs Behind Wall Switch Or at The Light | Compatible with SmartThings, Hubitat, and Home Assistant | Z-Wave Hub Required (Sold Separately)" brand: "zooz" price: "$92.86" currency: USD in_stock: true reviews_count: 6 url: https://www.desertcart.us/products/613584245-zooz-700-series-z-wave-long-range-smart-relay-zen51 store_origin: US region: United States of America --- # 700 Series Z-Wave chip for max range 120-240V & dry contact versatile control S2 Security + SmartStart for safe smart home ZOOZ 700 Series Z-Wave Long Range Smart Relay ZEN51 | Installs Behind Wall Switch Or at The Light | Compatible with SmartThings, Hubitat, and Home Assistant | Z-Wave Hub Required (Sold Separately) **Brand:** zooz **Price:** $92.86 **Availability:** ✅ In Stock ## Summary > ⚡ Upgrade your old switch to smart without losing style or control! ## Quick Answers - **What is this?** ZOOZ 700 Series Z-Wave Long Range Smart Relay ZEN51 | Installs Behind Wall Switch Or at The Light | Compatible with SmartThings, Hubitat, and Home Assistant | Z-Wave Hub Required (Sold Separately) by zooz - **How much does it cost?** $92.86 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/613584245-zooz-700-series-z-wave-long-range-smart-relay-zen51) ## Best For - zooz enthusiasts ## Why This Product - Trusted zooz brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Flexible Installation:** Fits behind switch or at fixture—no neutral wire? No problem. - • **Advanced Scene Control:** 7 multi-tap triggers unlock powerful custom automation. - • **Seamless Smart Upgrade:** Keep your classic toggle switch, add smart control behind the scenes. - • **Secure & Hassle-Free Setup:** SmartStart pairing with S2 encryption keeps your home safe and setup simple. - • **Ultimate Range & Reliability:** 700 Series Z-Wave chip boosts mesh network coverage and speed. ## Overview The ZOOZ 700 Series Z-Wave Smart Relay ZEN51 transforms your existing toggle switches into smart devices without replacing them. Compatible with major hubs like SmartThings and Hubitat, it supports 120-240V loads and dry contact applications, installs easily behind switches or at fixtures, and features a powerful 700 Series Z-Wave chip for extended range and reliable mesh networking. With SmartStart and S2 security, it ensures a safe, seamless smart home upgrade while preserving your favorite switch aesthetics. ## Description The relay is perfect if you like your old toggle switches and don’t want to replace them with smart decora style wall switches. You can simply install the relay behind your existing on/off switch to make it smart. Just make sure it’s not a dimmer or an illuminated switch – only simple mechanical and momentary switches can be used with this device. No neutral in the switch box? You can put this relay at the fixture where you’ll always find the neutral connection and still keep your wall switch in the set-up. Your hub will get an instant report if the light is turned on from the switch. ## Features - On/off Z-Wave control for 120-240V and dry contact applications: great for lighting control or 120-240V load monitoring (sump pumps, motion lights) - 700 series Z-Wave chip: greater coverage for a stronger mesh network - 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 - cene 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 reliableNOTE: 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. Z-WAVE FREQUENCY EU/UK: 868.42 MHz (used primarily in Europe) - no Z-Wave Long Range ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B0B5VR87JX | | Best Sellers Rank | 498,185 in DIY & Tools (See Top 100 in DIY & Tools) 6,214 in Switches & Dimmers | | Brand | ZOOZ | | Coil Voltage | 120 Volts (AC) | | Connector Type | Screw | | Contact Material | Silver | | Contact Type | Normally Open | | Country Of Origin | China | | Customer Reviews | 4.4 4.4 out of 5 stars (133) 4.4 out of 5 stars | | Eu Spare Part Availability Duration | 5 Years | | Included Components | User Manual | | Item Type Name | DRY CONTACT RELAY ZEN51 Z-Wave | | Lower Temperature Rating | 32 Degrees Fahrenheit | | Manufacturer | Zooz | | Manufacturer Part Number | ZEN51 | | Minimum Switching Voltage | 110 Volts (AC) | | Model Number | ZEN51 | | Mounting Type | Wall Mount | | Number Of Terminals | 3 | | Operation Mode | Manual | | Specification Met | Z-Wave Certified | | Unit Count | 1.0 count | | Upc | 853478006513 | | Wattage | 960 watts | ## Product Details - **Brand:** ZOOZ - **Connector type:** Screw - **Contact material:** Silver - **Contact type:** Normally Open - **Mounting type:** Wall Mount ## Images ![ZOOZ 700 Series Z-Wave Long Range Smart Relay ZEN51 | Installs Behind Wall Switch Or at The Light | Compatible with SmartThings, Hubitat, and Home Assistant | Z-Wave Hub Required (Sold Separately) - Image 1](https://m.media-amazon.com/images/I/51KeUTH42rL.jpg) ## Questions & Answers **Q: Can this be used without physical switches and only for control with via z-wave?** A: Yes, the device doesn't need a physical input (switch) and you can control is using Z-Wave commands only. Remember to check your local safety regulations to make sure an emergency physical wall control isn't required for the load you'd like to control with the Zooz device. **Q: I need similar that can run from 12-18vdc power, so I can relay some aux devices that also run on 12-18vdc. Do they make it?** A: I haven't found 1 for 18vdc So I used it to turn a 110v ac in 18vdc out powersupply on and off I know it's involved but it what I did **Q: Will these work on GFCI circuits? I have 2 outdoor lights that are on ground fault circuits and all of the zwave switches I have tried trip the gfci.** A: Yes, it can be installed on a circuit with a GFCI. I have this installed on an exterior circuit with GFCI and it works just fine. **Q: Does it click when on/off? If yes, how loud?** A: Any relay will make a sound when clicked so you will hear it when it's switched on and off. It's not too loud, just like your average 15A relay. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works with Home Assistant perfectly. *by on Reviewed in the United Kingdom 16 October 2025* Works well with Home Assistant and easy to wire up.Will be buying more! ### ⭐⭐⭐⭐⭐ Small, verstatile contact relay *by on Reviewed in the United States 20 December 2022* I had the ubiquitous Linear FS20Z-1 Z-Wave contact fixture module installed in my front wall for many years to automate the lights on top of the wall. After about ten years the module went kaput and seems to no longer be available. The Zooz 700 Series Z-Wave Plus Smart Relay does everything the FS20Z-1 did in a much smaller package, making it far easier to embed in the outlet box without working too hard to fit in all the wires. While this module is not rated for outdoor use the box is weather-insulated, and I further wrapped the Smart Relay in a sandwich bag sealed with duct tape, so I'm quite confident no moisture will enter. Temperatures are mild enough here in Silicon Valley that it should also almost always be within the operating range (32F - 104F).It paired easily with my SmartThings hub (V2) and works as expected. Note that I'm not using the switch contact, I'm only controlling it via Z-Wave, so I can't comment on that feature, but I have no reason to think it wouldn't work as expected. ### ⭐⭐⭐⭐⭐ Relay for 3d printers *by on Reviewed in Canada 29 March 2024* I purchased two of these to install directly in my 3d printers so that I could control power on/off through Home Assitant. Worked perfectly, setup with HA was straightforward and worked with the quick start code. ## Frequently Bought Together - Zooz 700 Series Z-Wave Long Range Smart Relay ZEN51 | Installs Behind Wall Switch Or at The Light | Compatible with SmartThings, Hubitat, and Home Assistant | Z-Wave Hub Required (Sold Separately) - Zooz 800 Series Z-Wave Long Range S2 On Off Switch ZEN76 800LR, White | Simple Direct 3-Way and 4-Way Solution (Works with Regular Switches, No Aux Switch Needed) | Z-Wave Hub Required - Zooz 800 Series Z-Wave Long Range S2 USB Stick ZST39 LR, Great for DIY Smart Home (Use with Home Assistant or HomeSeer Software) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/613584245-zooz-700-series-z-wave-long-range-smart-relay-zen51](https://www.desertcart.us/products/613584245-zooz-700-series-z-wave-long-range-smart-relay-zen51) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-15*