How does a no-neutral smart switch get power?

Explanation

A no-neutral smart switch still needs power for its internal electronics. Since neutral wire is not available in the switch box, the switch is designed to draw a very small current through the lighting circuit. A capacitor installed at the light side helps stabilise this small current and prevents the light from flickering or glowing. The exact design depends on the product, so the model-specific wiring guide should always be followed.

Common mistakes

• Thinking no-neutral means the switch does not need power
• removing the capacitor because the switch can pair initially
• using incompatible low-watt loads.

Troubleshooting / next steps

• Install the capacitor if the manufacturer requires it and check the minimum/maximum load requirements.

Recommended products

Related articles

• Why does a no-neutral smart switch need a capacitor?
• What capacitor should I use for a no-neutral smart switch?
• Where should the capacitor be installed for a no-neutral smart switch?
• Can one capacitor support multiple smart switch gangs?
• Does the capacitor consume electricity?