Zooz 700 Series ZEN51 Z-Wave Long Range Smart Relay — Behind Wall Switch

Overview

The Zooz ZEN51 is a compact Z-Wave Long Range smart relay designed to retrofit existing switches. Install it behind a wall switch or at the light fixture to add reliable wireless control without replacing your preferred switch style. Its small footprint makes it suitable for crowded boxes, and its dry-contact output supports a range of non-lighting applications beyond classic lighting control.

With 700-series capabilities, the ZEN51 supports advanced features like Z-Wave Long Range, SmartStart, and S2 authentication. It’s tested for North American safety standards and backed by Zooz support. A compatible Z-Wave hub is required to leverage voice or app-based automation.

Key benefits

• Adds Z-Wave to an existing wall switch while preserving your switch style and color.
• 3-way compatibility allows flexible wiring even if a neutral isn’t readily available at every box.
• Compact form factor (about 1.5" x 1.4" x 0.7") fits behind crowded switches or at the light fixture.
• Smart Bulb mode lets you control smart bulbs via Z-Wave without cutting power to them when off.
• Supports Z-Wave Long Range (up to 1,300 feet with LR enabled) and S2 security for added reliability.

Electrical notes and guidelines

• Important wattage limits: up to 960 W incandescent, up to 150 W LED, 10 A resistive, and 1/2 HP fan motors.
• Neutral wire is required; verify wiring before purchasing.
• For this relay, use with mechanical on/off or momentary switches; not compatible with dimmers or electronic/smart switches.

Smart home compatibility and usage

• Needs a Z-Wave hub to control via voice assistants or automation platforms (SmartThings, Hubitat, Home Assistant, HomeSeer).
• Backup and extend your smart home setup with 700-series features like SmartStart and S2 authentication.
• Ideal for replacing a traditional wall switch while keeping the switch aesthetic you prefer.

Installation tips

• Easy wiring with pigtail connections for quick setup.
• Small size helps fit even in tight electrical boxes.
• Indoor-use only; plan placement behind a wall switch or at the light fixture where power and neutral are accessible.

Important notes: This device requires a Z-Wave hub (sold separately) and a neutral wire. It is designed for specific load types and should be installed following the provided wiring diagrams to ensure safe operation.