29 New G20 (S) - DC Switch With Knife Contacts Kraus and Naimer have developed and designed a new DC Switch; the G20(S) The ‘Knife contacts’ have been designed in a new way resulting in a switching capacity of 20 Amps at 690V DC (DC-22A) and high short circuit withstand capability. Finger-proof terminals according to EN 50274 and protection degree IP20 offer maximum safety. With a standard latching mechanism, the G20 complies with all regulations required for main switches according to IEC/EN 60204. In addition the G20 is also ideal for AC applications with high short circuit fault levels, as well as electronic circuitry with low current and voltages. • Self-cleaning and vibration resistant knife contacts • Compact design • High DC switching capacity • Highest contact reliability (better than any H-bridge contact system) • High short circuit withstand capability • Finger-proof terminals (IP20) even if jumper leads are used • Terminal extensions (accessory item) for ring type cable lugs (max. width 6mm) and quick connect lugs available •Heat resistant contact system according to standard EN 12101-3 G20 - with normal latching (in preparation) G20S - with snap action latching KF Switch Range 1 Pole per module (16-32A) The innovative modular system is both simple and very safe while offering enormous flexibility. All available modules can be combined, exchanged or added in the field, as can the very precisely working cam-operated auxilliary contacts. The position of the various modules in relation to each other can be defined by the user, or if preferred, preassembled in the factory. Rotating contact movement (instead of the classical vertical lifting) allows • Big contact gaps • High mechanical life expectancy • Very precise movement sequence • Self cleaning contacts • Forced opening and closing of contacts • Compact (very shallow design) • Up to 1000V insulation voltage according to IEC possible • Lateral drive possible (latching module not in the centre but on left or right hand side) • Coupling profile determines pre-closing function of switched 4th pole • Visible contacts (windows) available on request • Design allows a big variation of terminal markings DC-21A DC-22A DC-23A Rated Operational Current le/A No. of Series Contacts G20S Total Voltage in Volts Utilisation Category 1 250 440 250 330 440 48 60 110 160 250 330 440 2 500 880 500 660 880 96 120 220 320 500 660 880 3 750 - 750 990 - 144 180 330 480 750 990 - 4 1000 - 1000 - - 192 240 440 640 1000 - - 5 - - - - - 240 300 550 - - - - 6 - - - - - 144 288 360 - - - - 20 13 20 10 5 20 15 12 8 5 3 1 Telephone now for a demonstration Product The innovative modular system is both simple and very safe while offering enormous flexibility. The position of the various modules in relation to each other can be defined by the user. Than assembled in the factory Telephone 1800 567 948 for further technical information
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