Shelly 2PM Gen4 Zigbee Smart Switch
Smart Electronics
“The Shelly 2PM Gen4 combines dual-channel relay control with per-channel power metering in a compact 37x42x16mm form factor. Local control via MQTT, embedded web interface, and multi-protocol support (Wi-Fi/Zigbee/Bluetooth/Matter) makes it a strong retrofit option for Home Assistant users, though Zigbee mesh reliability degrades with large device counts. Good for smart home enthusiasts needing local-only operation; caution advised for users planning to deploy many Zigbee devices without dedicated routers.”
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Per-channel wattage readings with dual-channel design enable independent load monitoring
reviews.cprice.coyou get actual wattage readings per channel, which is rare at this price point
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Fits in wall boxes where older bulkier controllers cannot, enabling retrofit upgrades
reviews.cprice.coShelly handles the job in a fraction of the space
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Cover mode with position calibration and motor stall detection for shutters and garage doors
reviews.cprice.copower-sensing intelligence to detect when a motor has stopped drawing current
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Local MQTT, web interface, schedules, scripts, and webhooks enable operation without cloud dependency
gadgetceo.comShelly a different profile from brands that expect every automation to live inside a cloud app
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Random Zigbee delays and timeouts occur even on devices near the coordinator, suggesting protocol instability
community.home-assistant.iorelays will randomly time out or take a long time to respond
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Large-scale Zigbee deployments may overwhelm coordinators, requiring dedicated router devices for stability
community.home-assistant.io44 relays being too many for the coordinator to manage on its own
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Zigbee configuration workflow not as smooth as expected compared to Wi-Fi operation
gadgetceo.comShelly flexibility is real, and setup details still matter
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Requires neutral wire, limiting installation compatibility with older wiring configurations
us.shelly.comNeutral Required YES
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That last one is a real problem: to update firmware or recalibrate, you have to physically access the device and hold a button for five seconds to switch it back to Wi-Fi mode — which means pulling it out of the wall every time.
reviews.cprice.coThat last one is a real problem: to update firmware or recalibrate, you have to physically access the device and hold a button for five seconds to switch it back to Wi-Fi mode — which means pulling it out of the wall every time.