relay

Shelly 1 Gen4

budget local: excellent Wi-FiBluetoothZigbeeMatterMQTT

Price: $27.99 verified Sep 8, 2026
HA fit: excellent
Works offline: yes
Setup: advanced
Hub needed: no

This is the newer version. It replaces the Shelly Plus 1, which stays in the catalog. 4.5/5 I own and tested the previous version - read the hands-on review.

All in-wall relays → Compare in-wall relays →

Affiliate link - I may earn a commission at no extra cost to you. As an Amazon Associate I earn from qualifying purchases; some links go to other retailers with the same arrangement.

Shelly 1 Gen4, a hardwired relay module small enough to sit behind a wall switch

Quick verdict

The Shelly 1 Gen4 is the current generation of Shelly's basic in-wall relay and the part that replaces the discontinued Shelly Plus 1. The core is unchanged: a module small enough to hide behind an existing switch, potential-free contacts for the load, and a local RPC API plus MQTT with no Shelly account. What is new is the radio choice. It ships Matter-certified over Wi-Fi, and five presses of the device button move it to a Zigbee 3.0 profile in which it also repeats the mesh. Only one profile runs at a time, so pick the network you want and leave it there. It still does not meter - that is the 1PM Gen4 - and it still needs a neutral at the box. I haven't run this one; the notes come from Shelly's spec sheet, the Home Assistant integration docs and what other owners report.

Standout: A dry-contact in-wall relay that can join Home Assistant over Wi-Fi, Zigbee or Matter - whichever radio profile you set it to at install time.

Notes last checked Sep 8, 2026.

Compatibility snapshot

Home Assistant excellent

Apple Home good

Google Home good

Alexa good

Works offline yes

Setup advanced

Extra hub needed no

Power hardwired

Local control facts

Home Assistant: shelly integration, Local Push, Platinum on the quality scale (home-assistant.io, checked Sep 10, 2026)
Zigbee2MQTT: supported device, listed as Shelly S4SW-001X16EU (1 Gen 4) (zigbee2mqtt.io, checked Sep 10, 2026)

Why it stands out

potential-free (dry) relay contacts, so it can switch a circuit that is not fed from the module's own line
three local paths into Home Assistant: the official Shelly integration over Wi-Fi, ZHA or Zigbee2MQTT in Zigbee mode, or Matter
repeats the Zigbee mesh when it is in the Zigbee profile rather than sitting on it as an end device
tiny enough to hide behind an existing switch, so the wall control keeps working exactly as it did

Reasons to hesitate

one radio profile at a time: it ships in the Matter-over-Wi-Fi profile and five presses of the device button switch it to Zigbee, which takes Wi-Fi and Matter away
no power or energy metering - it reports only an internal temperature; the 1PM Gen4 is the metered version of the same module
the module is supplied from line and neutral, so it needs a neutral in the box (the potential-free output is a separate matter from how the device is powered)
an in-wall mains install, not a beginner project

Best for

keeping an existing wall switch while putting the circuit it controls under local Home Assistant control
installs that need isolated dry contacts rather than a switched live output
households that have not settled on Wi-Fi versus Zigbee and want to decide at install time

Avoid if

you need power or energy metering on the circuit - the 1PM Gen4 is the model that meters
the switch box has no neutral
you expect Wi-Fi and Zigbee to run at the same time on one device
you are not comfortable working with mains wiring

Privacy and local-control notes

Local in every profile it can run: the Wi-Fi firmware has a built-in web interface, an RPC API and MQTT with no Shelly account required, Zigbee mode talks only to your own coordinator, and Matter is local by design. Shelly cloud is opt-in.

Home Assistant support: supported · integration path: Shelly (official core integration, Local Push) over Wi-Fi with the local RPC API or MQTT; ZHA or Zigbee2MQTT when switched to the Zigbee profile; Matter integration in the default Matter profile.

Buying reality check

Price notes: Shelly's own US store listed the UL-certified SKU at $27.99 and in stock on 2026-09-08, with a 2-pack at $54.86 and a 4-pack at $106.36. The US listing is the 15 A UL variant; Shelly's general spec sheet for the non-UL model reads 16 A at 240 V, so check which SKU is in the cart.

One verified price read so far: $27.99 at shelly-us on Sep 8, 2026.

Compare side by side: see relay comparisons →

What changed for this product

Sep 10, 2026 · Brief

Shelly at IFA 2026: ThreadLink, a Matter wall panel, and a EUR 39.90 camera

Shelly's IFA 2026 announcements: ThreadLink turns the Gen4 Thread radio into a full IP network, firmware 2.8.0 makes the Wall Display a Matter controller, and a EUR 39.90 camera does RTSP. What is local, what is not.
Sep 8, 2026 · Added

Shelly 1 Gen4 and 2PM Gen4 now have product pages

The guides have named these two as the parts to buy since Shelly discontinued the Gen2 Plus line, but neither had a page, so the only clickable relay link in those sentences still went to the superseded Plus model. Both now have pages with dated sources: the Shelly 1 Gen4 (potential-free contacts, no metering, $27.99 for the UL-certified US SKU) and the Shelly 2PM Gen4 (two metered channels, 10 A each and 16 A total, $39.99 - less than the Plus 2PM cost). Each ships in a Matter-over-Wi-Fi profile and switches to Zigbee with five presses of the device button, one radio at a time. I have run neither, and both pages say so.

From the change log and the news briefs that name this product.

Verified against

Shelly knowledge base (Wi-Fi 802.11 b/g/n/ax, Bluetooth 5 LE, Zigbee 3.0 with repeater, potential-free output 16 A/240 V and 10 A/30 V DC, 110-240 V supply from line and neutral, no voltmeter or ammeter) · checked Sep 8, 2026
Shelly USA store listing (US UL-certified SKU, 15 A dry-contact, Wi-Fi/Matter/Zigbee, $27.99, in stock) · checked Sep 8, 2026
Home Assistant integration docs (official core integration, Local Push) · checked Sep 8, 2026