VQ 30 CAT I, 4mm Series Test Plugs. Hirschmann test and measurement CAT I, 4mm series VQ 30 type test plugs, fully mating spring loaded connector, shatter-proof, with flexible insulated sleeve and 4mm diameter transverse hole. The tapering sleeve end also serves as strain relief and kinking protection for the lead. The test connectors are available in three colours and feature solder connection up to maximum cable cross-section of 2.5mm². Features and Benefits: ; Rated at 30A 30VAC/60VDC ; Nickel plated brass ; Temperature range -25 to +70° C