Use this checklist before asking for a model or comparing prices. It is designed to reveal missing information early, when a correction is still inexpensive.
1. Describe the supply, not only the nominal voltage
- Country, city or utility area;
- nominal voltage and frequency;
- lowest and highest readings seen in normal use;
- frequency of outages, reconnection and generator switching;
- whether lightning or switching surges are a known problem.
2. Identify the real load
- Appliance type and nameplate photo;
- rated current or power;
- compressor or motor starting behaviour;
- one appliance or several devices on the same output;
- continuous duty, intermittent duty or occasional use.
3. Separate the functions
Ask which functions are actually required: sustained high/low voltage cut-off, delayed reconnection, surge protection, overload/overcurrent, display, adjustable threshold or fixed settings.
Do not combine claims: a surge protector handles short transient events. A voltage protector disconnects a sustained abnormal supply. One function does not automatically prove the other.
4. Confirm plug, socket and installation
- Exact plug/socket standard or clear photos;
- portable plug-in, fixed wiring or DIN-rail installation;
- indoor temperature and ventilation;
- earth/ground availability;
- terminal and conductor requirements for higher-current products.
5. Confirm the commercial version
- Quantity and target price band;
- retail, wholesale, project or e-commerce channel;
- language, logo and packaging;
- required compliance documents by model and market;
- sample approval and change-control expectations.
A useful inquiry format
Country: …
Voltage range: …
Appliance: …
Rated current/power: …
Plug/socket: …
Required protection: …
Quantity and packaging: …