MS-12-140 is a marker strip component for the Series 140 barrier block system, specifically configured for 12-terminal applications. It is constructed from Nema Grade XPC material with UL Rating 94V-O, providing durable identification and organization of terminal positions. The marker strip integrates with the Series 140 barrier block architecture, which features molded monoblock phenolic insulation (UL Rated 94V-1), brass eyelets with nickel plating, and nickel-plated steel screws. This component operates reliably across the temperature range of -55°F to +300°F and is RoHS compliant. Marker strips are essential for equipment designers requiring clear terminal labeling and organization in electrical interconnection systems, particularly in applications demanding high electrical ratings and protection against wire fraying.