AC Light Switch Module

An AC light switch module is an in-line relay that turns line-voltage AC100–240V circuits on and off without altering the AC sine wave. Unlike a phase-cut dimmer, this compact lighting module sits inside a standard wall box or junction box behind a momentary push switch, receiving wireless RF, Wi-Fi, or Zigbee commands while maintaining local mechanical wall control. Because it uses physical relay contacts rather than TRIAC chopping, it powers non-dimmable LED drivers, electronic ballasts, and motors cleanly without causing line noise.

If your goal is only reliable on/off control without flickering, an AC light switch module is actually the safer choice over a dimmer switch. Many buyers install a phase-cut wall dimmer on non-dimmable LED fixtures and end up with strobe flashing or high-pitched humming. If you do need smooth brightness control rather than pure on/off power switching, step over to our dedicated AC Triac dimmers, which are engineered specifically for phase-controllable fixtures and dimmable drivers.

Yes, an AC light switch module is built specifically to switch non-dimmable led module lights and standard power supplies that cannot tolerate phase-cut dimming. When you run standard LED fixtures on a TRIAC control, residual leakage current often causes the lamps to glow dimly or cycle on and off when switched 'off'. Our switch modules use an internal relay disconnect that completely cuts the AC line, providing clean zero-leakage shutoff for every connected led module.

On a standard AC light switch module like our SS-B rated at 1.5A, the maximum recommended continuous LED load is 150W at 110V or 300W at 230V. LED drivers create an inrush current spike at startup that can reach 20 to 50 times their running current for 2 to 5 milliseconds. If your total load exceeds 200W of capacitive LED power supplies, step up to our 10A dry-contact relay model, the SS-C(WT) switch module, which uses zero-cross switching technology to handle brutal inrush surges.

Every AC light switch module in this series requires a continuous AC neutral connection to power its internal wireless receiver and logic board. The module terminals take AC Live In, AC Neutral In, AC Live Out to the light fixture, and two low-voltage or line-rated inputs for the external momentary push switch. If your wall switch box only has a two-wire switch loop containing switched hot and feed hot without neutral, you will need to pull a neutral wire or install the module at the ceiling fixture canopy.

Wi-Fi models like SS-B(WT) connect directly to your 2.4GHz home router via the Tuya app without a hub, whereas Zigbee models like SS-B(WZ) require a Zigbee 3.0 gateway to operate. Zigbee creates a self-healing local mesh network that executes instant local automations even when your external internet connection drops completely.

You should use a momentary push switch (normally-open retractive switch) rather than a standard latching toggle switch with an AC light switch module. The module senses a momentary pulse: a short tap toggles the relay between on and off states. While some firmware versions allow latching inputs, using a momentary button prevents out-of-sync states where the wall rocker switch points down while the app shows the light is on.

A single AC light switch module can pair with up to 10 handheld RF remotes, wireless wall panels, or push transmitters simultaneously. Using 2.4GHz RF technology, each module receives signals from up to 30 m away in open space, allowing you to create multi-way 3-way or 4-way wireless switching setups without running travelers through walls. To expand line-voltage LED lighting across larger rooms, pair the switch with our line-voltage AC LED strips.

Zero-cross switching technology ensures that the AC light switch module closes its internal relay contacts precisely when the AC alternating voltage sine wave passes through zero volts. Switching at 0V minimizes contact arcing and reduces peak inrush current into capacitive LED power supplies, extending the operational life of the relay past 100,000 cycles. We added 2 models in 2023 and 1 in 2024 featuring this design to prevent contact welding on high-inrush commercial driver loads.