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What belongs on an approved-vendor list for critical charger components?

List the parts that affect safety, performance or compliance, such as the transformer, capacitors, fuse, controller chips, connectors, cable and plastic.

Wecent Editorial Team Updated 28 Oct 2026 3 min read

The question

We want an approved-vendor list for the key parts in our chargers. Which parts should be on it, and what should the list contain?

Main answer · Wecent Editorial Team

Short answer: List the parts that affect safety, performance or compliance, such as the transformer, capacitors, fuse, controller chips, connectors, cable and plastic. For each, record the approved manufacturer, model, certificate reference and the rule that no change is allowed without your approval. Review the list at every sample, certificate renewal and supplier change.

Why an approved-vendor list helps

A factory can save money by changing a part without telling you. A change to a safety capacitor or a plastic grade may invalidate the test report. An approved list makes any change visible.

Which parts to include

Safety-critical. Transformer, safety capacitors, fuse, optocoupler, input and output connectors.
Controller and power parts. The power-delivery controller and GaN or silicon switches.
Cable and plug parts. Conductors, insulation, plug blades and strain relief.
Plastic and finish. Housing resin, flame rating and any coatings.
Battery parts, if the product contains a battery.

What to record for each

Part name and function.
Manufacturer and model.
Rating, such as voltage, current and temperature.
Certificate or listing reference, where relevant.
Alternate approved sources, if any.
Date approved and by whom.

Rules to set

No change without written approval.
Substitutions must be tested or evaluated against the report.
The factory must tell you about end-of-life notices for parts.
Parts must come from authorised distributors or manufacturers.

How to keep it alive

Review at every new sample, every certificate renewal and when a part is out of stock. Compare production units against the list from time to time by opening a sample.

Share it with the lab

Your certification body should have the same list in its report. If it does not match, find out why before the next order.

Quick summary

List critical parts with manufacturer, model and certificate, ban silent changes, and review the list at each milestone.

Where to start

Begin with the critical-components table in the existing test report. It already names the parts the laboratory evaluated, so copy those into your list and add the contact for each supplier. You can add the other parts over time.

Example entry

Part: safety capacitor. Manufacturer and model: as listed in the report. Rating: voltage class and capacitance. Certificate reference: the listing number. Alternate sources: none approved. Last review: date and name. A list built from entries like this fits on a few pages and is quick to check at each sample.

Where this answer says to confirm with Wecent, the detail is not published on the product page and has to come from the datasheet or the factory. General facts come from the regulators, standards bodies or device makers named in the text.

Three more perspectives

Wecent Editorial Team · Purchasing perspective

Add the list as an annex to the purchase agreement, with a clause on approved changes.

Wecent Editorial Team · Compliance/QC perspective

Check each listed part against the certificate’s critical-component table.

Wecent Editorial Team · After-sales perspective

Record the part versions against each production lot, so field failures can be traced.