{"product_id":"zooz-700-series-z-wave-long-range-smart-relay-zen51-behind-switch","title":"Zooz 700 Series Z-Wave Long Range Smart Relay ZEN51 - Behind-Switch","description":"\u003cp\u003eIn this review of the Zooz 700 Series Z-Wave Long Range Smart Relay ZEN51, the bottom line is simple: it is a compact, reliable way to add Z-Wave on\/off control to an existing wall switch or light fixture while preserving your switch style. It is best for DIYers and integrators who need a small relay that fits in crowded boxes, supports 3-way setups, and offers Z-Wave Long Range and SmartStart for easier pairing. The most compelling reason to buy is the combination of compact size and versatile dry contact output that lets this relay handle a variety of 120 V signal monitoring tasks safely when installed per instructions.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart relay for on\/off control:\u003c\/strong\u003e Adds Z-Wave control to your existing mechanical switch without changing the switch appearance, ideal for traditional homes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDry contact output:\u003c\/strong\u003e Provides a dry contact output useful for non-lighting applications while the input expects 120 V for accurate signal monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-way compatible:\u003c\/strong\u003e Works in multi-switch 3-way circuits and can be installed at the fixture where neutral is available if switch boxes lack neutral.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart bulb mode:\u003c\/strong\u003e Lets you keep power to smart bulbs while still controlling them via Z-Wave so switches retain normal function without cutting power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact form factor:\u003c\/strong\u003e Measures 1.5 in x 1.4 in x 0.7 in so it fits in most crowded single-gang boxes and simplifies retrofit installs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZ-Wave Long Range and security:\u003c\/strong\u003e Supports the 700 series features including extended range, SmartStart, and S2 authenticated security when the hub also supports them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis relay is aimed at homeowners, electricians, and smart home tinkerers who want to convert a conventional mechanical switch to a Z-Wave controlled circuit without replacing the visible switch. It is especially useful for installations where a neutral is available at the fixture or in boxes and for projects that benefit from a small relay that fits behind existing switches.\u003c\/p\u003e\u003cp\u003eUsers who rely solely on smart speakers without a Z-Wave hub should look elsewhere since a compatible Z-Wave hub is required for control. Also avoid using this relay with dimmers, electronic or smart switches, tube lights, or high-demand motor loads above the specified limits.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompact size and tidy pigtail wiring make installation in crowded boxes straightforward.\u003c\/li\u003e\n\u003cli\u003eReliable pairing and operation reported with SmartThings, Hubitat, and Home Assistant when using an updated Z-Wave hub.\u003c\/li\u003e\n\u003cli\u003eVersatile dry contact output and smart bulb mode expand use cases beyond simple lighting control.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNeutral wire is required, so it is not suitable where no neutral is present and you cannot access the fixture for installation.\u003c\/li\u003e\n\u003cli\u003ePower limits apply (do not exceed 150 W LED or 960 W incandescent) which restricts some heavy-duty loads.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eZEN51\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e110-120 V AC, 60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad ratings\u003c\/td\u003e\n\u003ctd\u003e960 W incandescent, 150 W LED, 10 A resistive, 1\/2 HP fans\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e1.5 in x 1.4 in x 0.7 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eZ-Wave range\u003c\/td\u003e\n\u003ctd\u003eUp to 300 ft line of sight, 1300 ft with Long Range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eETL certified to North American standards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnvironment\u003c\/td\u003e\n\u003ctd\u003eIndoor use, 32-104 F (0-40 C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe ZEN51 is a practical, good-value relay for anyone who needs discreet Z-Wave on\/off control behind an existing switch or at a light fixture. Its compact size, reliable pairing with major hubs, and smart bulb mode make it a smart retrofit choice, provided a neutral is available and loads stay within the stated limits.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eDoes this need a hub?\u003c\/strong\u003e\u003cbr\u003eYes. A compatible Z-Wave hub is required to include and control the relay; smart speakers alone will not work.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with dimmer switches?\u003c\/strong\u003e\u003cbr\u003eNo. This relay must be used with mechanical on\/off or momentary switches only and not with dimmers or electronic switches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the load limits?\u003c\/strong\u003e\u003cbr\u003eDo not exceed 150 W of LED or 960 W incandescent and use small fans under 1\/2 HP only.\u003c\/p\u003e","brand":"Zooz","offers":[{"title":"Default Title","offer_id":48260002349275,"sku":"B0B5VR87JX","price":37.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51KeUTH42rL._SL1353.jpg?v=1778301812","url":"https:\/\/gearmusthave.com\/products\/zooz-700-series-z-wave-long-range-smart-relay-zen51-behind-switch","provider":"GearMustHave","version":"1.0","type":"link"}