Electro PJP Jack, Plugs & Sockets Safety jack socket 619020 - PJP 3266-C-CD1-BL, The Electro PJP 3266-C-CD1-BL is a safety jack socket with a 4 mm pin diameter, available in blue. It is commonly used in laboratory settings for secure electrical connections. This jack socket ensures reliable performance for 4 mm connectors. Electro PJP 3266-C-CD1-BL Safety Jack Socket Blue Ø4mm 1000V CATIII