--- product_id: 613584245 title: "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: "374.58 DT" currency: TND in_stock: true reviews_count: 6 category: "Zooz" url: https://www.desertcart.tn/products/613584245-700-series-z-wave-long-range-smart-relay-zen51-installs store_origin: TN region: Tunisia --- # 960W max load Z-Wave 700 Series long range Fits behind existing switches 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:** 374.58 DT **Availability:** ✅ In Stock ## Summary > ⚡ Upgrade your lighting game without changing a switch! ## Quick Answers - **What is this?** 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?** 374.58 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/613584245-700-series-z-wave-long-range-smart-relay-zen51-installs) ## 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 - • **Compact & Discreet:** Ultra-small relay fits effortlessly behind your wall switch or at the fixture for a clean install. - • **Instant Status Updates:** Get real-time light status reports directly to your smart hub for total control and peace of mind. - • **Seamless Smart Upgrade:** Transform your classic toggle switches into smart controls without replacing them. - • **Reliable Z-Wave 700 Tech:** Enjoy extended range and robust connectivity with the latest Z-Wave Plus protocol. - • **Neutral-Free Installation:** Install at the fixture to bypass neutral wire limitations and keep your original switch setup. ## Overview The ZOOZ 700 Series Z-Wave Long Range Smart Relay ZEN51 is a compact, behind-the-switch smart relay that enables traditional toggle switches to become smart-enabled. Compatible with SmartThings, Hubitat, and Home Assistant, it supports up to 960 watts and uses the latest Z-Wave 700 Series for extended range and reliable connectivity. Designed for easy installation even without a neutral wire at the switch, it provides instant on/off status updates to your hub, making it perfect for millennial professionals seeking smart home upgrades without sacrificing style or convenience. ## 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. Review: Works with Home Assistant perfectly. - Works well with Home Assistant and easy to wire up. Will be buying more! Review: 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. ## Features - Z-Wave ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0B5VR87JX | | Best Sellers Rank | 339,578 in DIY & Tools ( See Top 100 in DIY & Tools ) 4,318 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 | 4.3 4.3 out of 5 stars (128) | | 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 | | UPC | 853478006513 | | Unit Count | 1.0 count | | Wattage | 960 watts | ## Product Details - **Brand:** ZOOZ - **Connector type:** Screw - **Contact material:** Silver - **Contact type:** Normally Open - **Mounting type:** Wall Mount ## Images ![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 R***R on 16 October 2025* Works well with Home Assistant and easy to wire up. Will be buying more! ### ⭐⭐⭐⭐⭐ Review *by B***D on 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. ### ⭐⭐⭐⭐⭐ Review *by J***E on 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.tn/products/613584245-700-series-z-wave-long-range-smart-relay-zen51-installs](https://www.desertcart.tn/products/613584245-700-series-z-wave-long-range-smart-relay-zen51-installs) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-01*