Look for a verifiable business identity, clear contact details, item-specific photos and written condition and warranty terms. A supplier should distinguish stock claims from manufacturer technical data and explain the inspection scope without implying manufacturer authorization.

Match the full model and suffix across the quotation, product label and purchase order. Record quantity, condition, shipment destination, packaging requirements, commercial terms and the documents required for customs clearance.

Request readable rating-label and terminal photos and compare the three-phase input, output setting, load demand, mounting arrangement and protective devices with the existing installation. A matching output current alone does not establish interchangeability.

Treat inconsistent suffixes, reused or unreadable label photos, unexplained substitutions, unverifiable stock quantities and refusal to provide written terms as warning signs. A request to skip compatibility review should prompt further checks.

Stockoems provides written warranty terms for the quoted item. Report the order number, installation context and observed issue through the contact channels below. Obtain return authorization before shipment so handling and assessment can be coordinated.