The bCX1 Series Technical Reference Manual shows part number 01-2100-299 as lightning protection for Continuum. The cut sheet on iPortal does not specify which model PC642C this is.
Details on iPortal do not specify which specific model of the PC642 series is supplied with part number 01-2100-299.
The part number 01-2100-299 on iPortal (here) corresponds with the 15V model of that lightning arrestor. This also comes with the base, Emerson part numbers below.
PN PC642C 015 Leaded
PN PCB1B BASE Leaded
The PDF for the Edco PC642 Series is here.