How to use Connect the device in series with one of the 220V AC input lines. It does not matter whether you attach it to the live wire or the neutral wire. Do not connect in parallel. A parallel connection would create a short circuit. Key benefits Simple inline installation in 220V circuits Polarity agnostic on the input side (live or neutral can be used) Maintains rest of the circuit unchanged when installed in series Compatibility and attributes Designed for standard 220V AC input Intended for series operation within 220V circuits Size, material, and exact performance are determined by the specific model; consult the product datasheet for details Use scenarios Inline connection to a 220V appliance such as a lamp or other singleload device in a fixed installation In a lab or workshop test setup where you want to insert the component between a power source and a load for measurement or testing In field wiring where a simple inline component is required without concern for wire polarity on the input side