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
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Certifications
Third-party safety certifications. UL = required for US NEC installations. CE = EU compliance. CSA = Canadian standards.
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CE, UL
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Smart Home Integrations
Compatible smart home platforms and voice assistants.
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Home Assistant, MQTT, Alexa, Google Home, Shelly Cloud (optional)
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Mounting Type
How the button attaches to the panel. Panel mount is standard — installs through a cutout from the front.
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Behind wall switch (DIN rail option available)
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Protocol
The wireless communication standard. BLE = short range, phone direct. Zigbee = mesh network, needs hub. Z-Wave = mesh, needs hub. WiFi = direct, higher power.
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WiFi 2.4GHz + Bluetooth
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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
- Smart Home Integrations
- Home Assistant, MQTT, Alexa, Google Home, Shelly Cloud (optional)
- Mounting Type
- Behind wall switch (DIN rail option available)
- Protocol
- WiFi 2.4GHz + Bluetooth
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 — ”