SNSW-001X16EU
ActiveShelly 1PM Gen3 WiFi Relay Behind Switch
Shelly 1PM Gen3 — WiFi relay that installs behind any existing wall switch.
Common Applications
Turns any dumb wall switch into a smart switch. Installs behind the existing switch in the junction box. Local HTTP API + MQTT — no cloud needed. Power monitoring (PM = Power Metering). ESP32-based — flashable to ESPHome or Tasmota. The most flexible smart switch solution: keeps your existing switches, adds smart control.
Openness & Hackability
Custom firmware: Stock (local HTTP/MQTT/CoAP), Tasmota, ESPHome
The gold standard for hackable behind-switch relays. Local API works without internet. OTA flashable to Tasmota/ESPHome. Auto-discovered by Home Assistant. Power consumption monitoring included.
Specifications
|
Certifications
Third-party safety certifications. UL = required for US NEC installations. CE = EU compliance. CSA = Canadian standards.
|
CE, UL
|
|
Control
|
Local HTTP REST API + MQTT (cloud optional); HA native
|
|
Device type
|
In-wall/DIN WiFi+BT relay, 1ch 16A, with power/energy metering (works with external switch)
|
|
Gen3 features
|
Matter support, Bluetooth gateway, improved chip/range
|
|
Smart Home Integrations
Compatible smart home platforms and voice assistants.
|
Home Assistant, MQTT, Alexa, Google Home, Shelly Cloud (optional)
|
|
Mounting Type
How the button attaches to the panel. Panel mount is standard — installs through a cutout from the front.
|
Behind wall switch (DIN rail option available)
|
|
Protocol
The wireless communication standard. BLE = short range, phone direct. Zigbee = mesh network, needs hub. Z-Wave = mesh, needs hub. WiFi = direct, higher power.
|
WiFi 2.4GHz + Bluetooth
|
|
Wiring
|
Neutral required; behind-switch or DIN; momentary/toggle input + detached-switch mode
|
Installation Quick Reference
Setup: Pair with your hub or phone via WiFi 2.4GHz + Bluetooth. Most smart buttons support single press, double press, and long press for three different actions.
Battery: Uses CR2032 battery. Expected life: 1-2 years. Low battery notification via the app.
Dimensions
Troubleshooting
Not responding to input
Check wiring continuity with a multimeter. Verify the contact block is properly seated. Inspect terminals for loose connections.
Where to Buy
Price range
$95.85 — $130.84
across 2 distributors
Quick Specs
- Certifications
- CE, UL
- Control
- Local HTTP REST API + MQTT (cloud optional); HA native
- Device type
- In-wall/DIN WiFi+BT relay, 1ch 16A, with power/energy metering (works with external switch)
- Gen3 features
- Matter support, Bluetooth gateway, improved chip/range
- Smart Home Integrations
- Home Assistant, MQTT, Alexa, Google Home, Shelly Cloud (optional)
What People Are Saying
“Turns any dumb wall switch into a smart switch. Installs behind the existing switch in the junction box. Local HTTP API + MQTT — no cloud needed. Power monitoring (PM = Power Metering). ESP32-based — ”