Smart relays and switch modules
A smart relay (switch module) is a small box that fits behind your existing switch or into the distribution board. It turns an ordinary light, water heater or pump into a smart appliance you control by phone, voice or automation.
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How to choose a smart relay
Wi-Fi relays, Zigbee relays and Z-Wave modules basically do the same thing – switch a circuit. They differ in protocol, number of channels, maximum current and whether they need a neutral wire.
- Single or dual channel – Shelly 1 and 1PM for one light, Shelly 2PM or FIBARO Double Switch for two circuits or shutters.
- With power metering – PM versions show the power and consumption of the connected load.
- No neutral – Sonoff ZBMINI L2 or Shelly 1L for older boxes with only live wire.
- Potential-free contact – Shelly 1 or FIBARO Smart Implant for a boiler, gate or doorbell.
Shelly Wi-Fi relays work standalone, Sonoff Zigbee relays and FIBARO and Nice Z-Wave modules need a hub. For brightness control use a smart dimmer.
Frequently asked questions
How big a load can a relay handle?
It depends on the model – common modules handle 8 to 16 A. For larger loads such as a water heater use a relay with headroom or a contactor.
Does a relay fit behind a switch?
Yes, modules are designed for standard boxes behind switches. If the box is crowded, we recommend a deeper one.
Do I need an electrician?
Connecting to 230 V wiring should be done by a qualified person.