What This Keying Plug Does in a CPC Connector System
The TE Connectivity 207597-1 is a keying plug for the CPC (Circular Plastic Connector) series — specifically designed for Series 3 and Series 4 housings that accept Type X11 contacts. Its job is to occupy an unused cavity in the connector insert, blocking that position so only a mating insert with the corresponding keying void can engage. This prevents mismating of connectors in multi-circuit harnesses where several identical-looking CPC connectors sit side by side. The plug is molded from black thermoplastic and installs into the rear of the pin or socket insert before the contact is loaded.
Compatibility — Which CPC Connectors Accept This Plug
This keying plug fits CPC Connector Series 3 and Series 4 housings that use Type X11 contacts. That covers the standard CPC circular shell sizes that accept crimp contacts in the 16-20 AWG range. If your assembly uses a different contact family — say Type III+ or Type XII — this plug will not seat in the insert cavity. The plug itself carries no electrical rating; it is a mechanical cavity filler that preserves the keying scheme.