Can this be used without physical switches and only for control with via z-wave?

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.

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?

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

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.

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.

Does it click when on/off? If yes, how loud?

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.

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Zooz ZEN51 Z-Wave 700 Series Long Range Smart Relay | Installs Behind Wall or Light Switch | Compatible with SmartThings, Hubitat and Home Assistant

Zooz ZEN51 Z-Wave 700 Series Long Range Smart Relay | Installs Behind Wall or Light Switch | Compatible with SmartThings, Hubitat and Home Assistant

Product ID: 679466701

Details

Brand
ZOOZ
Connector type
Screw
Contact material
Silver
Contact type
Normally Open
Mounting type
Wall Mount

⚡120-230V High Power Control

📶Z-Wave 700 Long Range

🔒S2 Authenticated Security

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Description

🔌 Power your smart home with invisible genius.

SMART BULB MODE - Control smart bulbs without cutting power—preserve your switch style and smart lighting vibe.
MULTI TAP STAGE CONTROL - Unlock 7 customizable triggers to elevate your switch’s functionality (hub-dependent).
NEXT GEN Z WAVE 700 CHIP - Experience extended range and a stronger mesh network that keeps your smart home connected.
SEAMLESS SMART INTEGRATION - Works flawlessly with SmartThings, Hubitat & Home Assistant for ultimate home automation.
DISCREET BEHIND THE WALL INSTALLATION - Compact design fits behind existing switches for a clean, clutter-free smart upgrade.

The Zooz ZEN51 is a compact, high-performance Z-Wave 700 Series smart relay designed for behind-the-wall installation. It supports 120-230V loads, offers long-range Z-Wave connectivity, and advanced security with S2 authentication. Compatible with major hubs like SmartThings, Hubitat, and Home Assistant, it features Smart Bulb Mode to maintain switch aesthetics while controlling smart bulbs, plus multi-tap triggers for enhanced control. Ideal for professionals seeking a sleek, reliable upgrade to their home automation setup.

Specifications

ASIN	B0B5VR87JX
Brand Name	ZOOZ
Coil Voltage	120 Volts
Connector Type	Screw
Contact Material	Silver
Contact Type	Normally Open
Customer Reviews	4.4 4.4 out of 5 stars (132)
Included Components	No.
Manufacturer	Zooz
Minimum Switching Voltage	120 Volts
Model	ZEN51
Mounting Type	Wall Mount
Operation Mode	Automatic
Part Number	ZEN51
UPC	853478006513
Unit Count	1 Count
Wattage	960 watts

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