Which costs are easy to miss in contactor quotations?

Besides the unit, costs may include auxiliary contacts, coil spares, overload relays, terminals, rails and commissioning. Comparing only unit prices understates retrofit cost. Checklist: Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.