Quick verdict
The ZEN52 is two ZEN51 relays in one package. Tuck it behind a two-gang switch and both switches become Z-Wave smart while keeping their original look. Both channels show up independently in Home Assistant. Wiring is not trivial, but the result is clean.
Standout: Two independent dry contact relays in one module. Smart-ify a two-gang box without replacing either switch.
Last checked: 2026-03-22