Electrical Test Quick Release Terminal Connectors SDK 5230 Series, Fully insulated, Panel Mount. A range of Schutzinger panel mount CAT II terminal connectors with a 12.5mm x 4mm safety window and are ideal for achieving quick contact with wires, 20N spring force, simply push to retain or release. The SDK 5230 series quick release terminal connectors feature a single pole and are utilised for the transmission of voltages, currents and electrical test data, part of the Shutzinger Ø 4mm safety programme range. Insulation - body material PA6.6 Protected Insertion window 12mm x 4mm Rated voltage 300V / CAT II Panel mount thickness 5mm max.