Explanations of Options

Model-
Front Mount Panel Connector - Connector inserted through the front, held on by back lock nut
Back Mount Panel Connector - Connector inserted through the back, held on by front lock nut
PCB - for printed circuit board
Cable Type-
PVC - Polyvinyl Chloride - Most common cable insulation material, wide operating temperature range (-40 F to 221 F)
CEI2011 II - International approval rating based on standards set by Italy
0.25 - Conductor size