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

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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546.65 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your smart home with invisible tech that’s anything but basic!

SMART BULB MODE MAGIC - Keep your classic switch look while controlling smart bulbs without cutting their power.
MULTI TAP STAGE CONTROL - Unlock 7 customizable triggers to extend your switch’s functionality like a pro.
BEHIND THE WALL ELEGANCE - Discreet installation behind existing switches—no need to sacrifice style for smart tech.
NEXT GEN Z WAVE 700 CHIP - Experience ultra-strong mesh network coverage and reliable signal repeater for zero dead zones.
SEAMLESS SMART INTEGRATION - Works flawlessly with SmartThings, Hubitat & Home Assistant for a truly connected home.

The Zooz ZEN51 is a cutting-edge Z-Wave 700 Series smart relay designed for behind-the-wall installation, compatible with major hubs like SmartThings, Hubitat, and Home Assistant. It supports 120-230V loads, offers advanced security with S2 authentication, and features Smart Bulb Mode to maintain switch aesthetics while controlling smart bulbs. With multi-tap triggers and a built-in signal repeater, it ensures a powerful, reliable smart home network backed by a 5-year warranty.

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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