643405-1 is a 5.0 mm Power Key Connector (5.0 PKC) designed as a wire-to-board connector for power circuits in home appliances, particularly gas appliances. This connector features a compact design with a 19.4 mm mated height and operates with a 5.0 mm contact centerline spacing. The connector incorporates a duplex configuration with pre-tinned contacts, UL94V-2 flammability rating, and is designed for 4-circuit applications with a dimension of 1.050 inches (26.67 mm). Key design features include a double lock plate for complete contact loading, locking levers surrounded by protective walls to prevent wire tangling, and bubble-release design for potted applications. The connector is recognized by Underwriters Laboratories Inc. (File No. E28476) and certified by Canadian Standards Association (File No. LR7189), making it suitable for demanding power distribution applications requiring reliable electrical connections and mechanical durability.