Sonoff ZBMINIL2: Zigbee Smart Switch Without Battery or Neutral Wire

The Sonoff ZBMINIL2 solves a real problem: most older European homes don't have a neutral wire at the switch box, which blocks installation of every standard smart switch. The ZBMINIL2 is mains-powered directly from the live wire -- no battery, no neutral required -- and it's small enough to disappear behind your existing switch plate.

At 39.5 x 32 x 18.4 mm, it fits in standard 86mm EU gang boxes. This review covers the ZBMINIL2 across Zigbee2MQTT, ZHA, and eWeLink installations -- the most common setups. That's the whole point of this device. It doesn't replace your switch. It sits behind it, turns your existing mechanical switch into a smart trigger, and adds Zigbee radio control on top.

Why Mains Power Beats Battery Here

Battery-powered smart switches are fine for sensors, remotes, and buttons. They're not fine for a relay that switches your lights 15 times a day. A CR2032 in a heavily used switch runs down in 6-9 months. Then you're standing in the dark replacing coin cells.

The ZBMINIL2 draws power from the mains line it controls. It's always on, always connected, never needs charging or battery replacement. For a device installed inside a wall box that you'll interact with hundreds of times per year, mains power is the right choice -- full stop.

This is different from a battery-powered remote like the Philips Hue Smart Button, which you pick up, carry around, and replace batteries in. The ZBMINIL2 is infrastructure, not an accessory.

Zigbee 3.0 and Home Assistant Setup

The ZBMINIL2 uses Zigbee 3.0, which means it pairs with any compliant coordinator. I run it via Zigbee2MQTT with a Sonoff Zigbee 3.0 USB Dongle Plus and it showed up in Home Assistant within 30 seconds of pairing. No eWeLink account, no cloud. The entity creates a simple on/off switch in HA -- that's all you need.

The ZBMINIL2 pairs reliably with all major Zigbee coordinators:

• Sonoff Zigbee 3.0 USB Dongle Plus (recommended, fastest pairing)
• ConBee II (Dresden Elektronik)
• HUSBZB-1 (USB combo stick, ZHA-compatible)
• SLZB-06 (Ethernet coordinator, no USB needed)

For those using the eWeLink ecosystem with the SONOFF iHost or NSPanel Pro, it integrates there too. And if you want Alexa or Google Home control without Home Assistant, you can pair it through eWeLink and link that to your voice assistant of choice.

What it doesn't do: dimming, power monitoring, or multi-channel control. One relay, one channel, on or off. If you need dimmer control, you need a different device. For basic switching of lights, fans, or any resistive load under 10A, the ZBMINIL2 does exactly what it says.

Installation: What to Check First

The no-neutral feature has one condition -- your switch wiring must run live and load through the switch box, with neutral going directly to the light fitting. This is true of most European single-gang boxes. If your electrician put neutral at the switch box too, even better; the ZBMINIL2 works with or without it.

Pull the switch plate, count the wires. Two wires (plus ground): standard no-neutral installation. Three wires (plus ground): you have neutral available. Either way, the ZBMINIL2 handles it.

The actual connection takes about 10 minutes: live to L-in, load to L-out, connect S1 and S2 to your existing switch mechanism. The physical switch now acts as an external trigger -- press it and the relay toggles. You can also toggle it from Home Assistant, Alexa, or Google Home without touching the wall switch at all.

ZBMINIL2 vs Aqara H1 EU No Neutral

The ZBMINIL2 is invisible -- your switch looks identical after installation. The Aqara H1 replaces the switch plate entirely, which gives you a cleaner look if your existing plate is dated, but costs three times as much. Choose based on whether you want the aesthetics to change.

Who Should Buy the ZBMINIL2

If you have older EU wiring without neutral at the switch box and want reliable, cloud-free Zigbee switching for under EUR 15, this is one of the best options available. It won't win prizes for features. It switches your lights on and off reliably, pairs instantly with Home Assistant and SmartThings, and never needs a battery replacement because it runs from your mains line.

That's what it does. That's enough.

One thing worth knowing before you buy: the ZBMINIL2 is a single-channel relay. One device controls one circuit. If you have a double-gang plate with two switches, you need two ZBMINIL2 units. At EUR 12-15 each, that's still cheaper than a single Aqara H1 EU, and each unit acts as a Zigbee router in your mesh, strengthening signal coverage across the flat. For most apartments, two or three of these cover the hallway, living room, and bedroom without breaking the budget.