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Honeywell's model selection guide directly identifies 621-9934C as a 115/230 Vac 8 A I/O rack power supply in the LC621 I/O Controller. The guide does not establish whether the installed unit can be switched between voltages in the field. Match the complete physical label, revision, receiving rack and site configuration before ordering or replacement.
The Honeywell manufacturer selection guide provides a direct exact-model reference for 621-9934C. It identifies the part as a 115/230 Vac 8 A I/O rack power supply in the LC621 I/O Controller. This is strong evidence for the part's basic identity but not for every installation limit or present stock condition. The guide does not establish whether the installed unit can be switched between voltages in the field. Do not import terminal ratings, dimensions, accessories or revision compatibility from neighboring product codes. Use the guide together with readable labels and the original project documentation when selecting a replacement.
At the order stage, compare a photograph of the offered unit with the installed full part number, suffix and revision. Check the receiving rack, original cable or terminal arrangement, factory options, electrical service and the approved site drawings. Retain photographs and diagnostic records before removal. Follow local isolation and handling procedures. After a verified replacement, check diagnostics and every affected I/O, communication or supply path under the commissioning plan. Final packed size and weight must be measured from the actual consignment.
The exact 621-9934C part number appears in Honeywell's model selection table as a 115/230 Vac 8 A I/O rack power supply. The entry places it in the LC621 I/O Controller. That identity must still be checked against the supplied nameplate and full revision. A nearby catalog number or a shortened suffix is not automatically an approved substitute.
Before fitting the part, compare the receiving rack, installed position, connected equipment, cable or terminal map and approved drawings. The guide does not establish whether the installed unit can be switched between voltages in the field. Record the original configuration and obtain written clarification if the offered assembly differs in revision or factory option. Installation decisions must follow the actual project documentation.
The reviewed Honeywell guide supports only the exact identity and catalog function described here. It does not certify stocked-unit condition, final shipping dimensions, packed weight or every electrical and mechanical limit. Stronger claims need an exact technical manual, readable nameplate or written confirmation against the physical assembly.
Verify the complete 621-9934C nameplate, hardware revision, receiving LC621 I/O Controller and the original project configuration. The exact catalog statement is I/O rack supply, 115 or 230 Vac factory selection, 8 A. The guide does not establish whether the installed unit can be switched between voltages in the field. Do not infer an unlisted terminal pinout, port count, field-adjustment feature, hot-swap status or accessory scope from a neighboring model. Keep the manufacturer's guide and approved site drawing as the order baseline.
Record the installed position, terminal or cable arrangements, adjacent cards, power source and original diagnostics. Follow the approved isolation, lockout and handling procedure before moving hardware. Compare the delivered spare with the baseline before fitting it. On return to service, confirm rack diagnostics and test each affected input, output, communications path or power circuit as applicable. Document acceptance and preserve the original assembly until the site releases it.