The Shelly 1 Gen4 is a compact one-channel dry-contact relay for lights, appliances, heating and cooling, doorbells, and irrigation. Control can run hub-free through the Shelly Smart Control app, or through Matter, Wi-Fi, Zigbee, and Bluetooth. The body is 37 × 42 × 16 mm.

Neutral is required. Max switching is 16 A / 240 V AC. Supply is 110–240 V AC or 24–48 V / 12 V DC. Integrated energy metering is not on this module. Model is S4SW-001X16EU.

Pros
– The Shelly 1 Gen4 is a compact multiprotocol dry-contact relay with Matter, Wi-Fi, Zigbee, and Bluetooth, plus hub-free control
– Max switching is 16 A / 240 V AC where neutral is available

Cons
– Neutral is required; a no-neutral install is not supported
– Integrated energy metering is not on this module, and the load cannot exceed 16 A

Shelly 1 Gen4

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Where to buy (prices as of 2026-08-23)

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