Vacuum Circuit-Breaker
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747 DRIESCHER - Indoor Vacuum Circuit-Breaker • Rated voltage 12 kV up to 38,5 kV • Rated current 630 A up to 2500 A

747 DRIESCHER - Indoor Vacuum Circuit-Breaker from 0 to 100 km/h in 0,03 seconds Category for capacitive current breaking C2 Category for mechanical switching M2 Rated voltage Rated short time circuit current Rated current 2500 A * this type with rated voltage 24 kV, was tested with a test voltage of 25 kV (On/Off test). ** this type with rated voltage 36 kV, was tested with a test voltage of 38,5 kV (On/Off test).

747 DRIESCHER - Indoor Vacuum Circuit-Breaker according to EN 62271-100 General, operating conditions, maintenance Design and principle of operation of the circuit-breaker Schematic diagram of the design Technical data, type designation Schematic diagram of release mechanism, motor-operated mechanism Standard wiring diagram, accessories General The new DRIESCHER vacuum circuit-breaker is a technological development of the well- proven vacuum circuit-breaker series 746. These three-pole indoor circuit-breakers are designed for rated voltages of 12 kV up to 38,5 kV and rated currents of 630 A...

747 Design and principle of operation of the vacuum circuit-breaker The new DRIESCHER vacuum circuit-breaker is a technical further development of our well-proven vacuum circuit-breaker series 746. This vacuum circuit-breaker is made up of the following five (refer also to page 5) sub-assemblies which are coordinated with maximum precision: The operating shaft 5 assembled in the breaker frame transmits the operating energy via insulating bars (8) to the vacuum interrupters. Advantage of the breaker frame: - compact design possible - very lightweight and stable Via operating mechnism 1 the...

747 Schematic diagram of assembly design and operating principle 10 11 Basic equipment: - Push-button for ON and OFF switching on site - Display of breaker position ON/OFF - Display of charging condition of coil-spring energy storage mechanism - Operations counter - Electric motor - Pump suppresser - Auxiliary switch for motor, controls and locking mechanisms - Additional releases (refer to page 7) • Very high mechanical service life through optimised power transmission of precisioncoordinated subassemblies with end position damping • Flexible application through compact design • Shorter...

747 Technical data Rated voltage Rated frequency Rated current Rated short-time current Rated short-circuit duration Rated peak withstand current Rated impulse withstand voltage Rated power frequency withstand voltage Closing time approx. Arcing time Opening time approx. Direct current component Rated short circuit breaking current Rated short circuit making current Rated cable charging breaking current Operating cycles - of the vacuum tube at rated current - of the vacuum tube at rated short circuit breaking current - of the breaker mechanism Cable charging switching class Mechanical life...

747 Schematic diagram of release mechanism Striker-pin arresting bolt M 5 only in Type RSA (remove for commissioning !) Manual operation (only in type ASA and WSA) AC operation Rated voltage (V) Shunt release Transformer-operated release Motor-operated mechanism Motors can optionally be delivered for AC or DC systems. The motors operate in short-time duty (S2). Motor voltage (V) The supply voltage should not deviate from the rated supply voltage by more than -15% to +10%.

747 Vacuum circuit-breaker Ur 12 kV Front view Side view ON-OFF Display Typeplate ON Display for number of operations available OFF Manual emergency charging of energy storage mechanism Rated voltage Rated Rated short circuit Pole distance current breaking current p (mm) c The vacuum circuit-breakers of type KUF listed here are equipped with a motor actuator and are suitable for auto-reclosing. All breakers are also available as type F-BK, manually operated circuit-breakers. All types are also available as 1-pole design. hexagon bolt M12x40 (from 1600 A; M12x50) with nut, washer and lock...

Front view Side view ON-OFF Display Typeplate ON Display for number of operations available OFF Manual emergency charging of energy storage mechanism Rated voltage Rated Rated short circuit Pole distance current breaking current p (mm) c The vacuum circuit-breakers of type KUF listed here are equipped with a motor actuator and are suitable for auto-reclosing. All breakers are also available as type F-BK, manually operated circuit-breakers. All types are also available as 1-pole design. Footnotes 1) to 8) see left side page 8

Front view Side view storage mechanism Typeplate DisP|ay for number ot operations available Rated Rated Rated short circuit Pole distance voltage current breaking current p (mm) c The vacuum circuit-breakers of type KUF listed here are equipped with a motor actuator and are suitable for auto-reclosing. All breakers are also available as type F-BK, manually operated circuit-breakers. All types are also available as 1-pole design. 1) hexagon bolt M12x40 (from 1600 A; M12x50) with nut, washer and lock washer 2) threaded pin (fixed) with nut, washer and lock washer 3) for 1250 A two connecting...

747 Standard wiring diagram Accessories The accessories for the vacuum circuit-breaker consists of a emergeny hand-crank for the energy storage mechanism. More accessories for the application in switchgears, for e.g. withdrawable trucks with and without motor actuator, auxiliary truck or service truck, can be find in brochure 785, switchpanels in withdrawable design Type WEL or E2K, E3K. Drawing no. Application LS4-096793 integral mounting 12, 24, 36 kV LS4-096793 integral mounting 12, 24, 36 kV LS4-096793 withdrawable-unit design range 300 mm LS4-096793 withdrawable-unit design range 200...

Our range of products includes: Medium-voltage systems • Single-bus and duplicate-bus switchgear • Non-withdrawable, withdrawable, and truck-type units • Compact switchgear assemblies • Customer-specific models • Industrial systems Medium-voltage switchgear • Indoor switches, disconnectors, and earthing switches (single and triple pole) • Indoor circuit breakers (low oil content and vacuum) • Outdoor switches (low oil content and vacuum) • Railway switches for power supply and catenary • High-voltage high-breaking-capacity fuses • Customer-specific models Low-voltage systems •...