Manufacturer: Merlin Gerin Rated voltage, kV: 10 Rated current, A: 630 Rated shutdown current, kA: 31.5 VO cycles, at rated current: 10000 VO cycles, at short-circuit current: 40 Electrodynamic resistance (kA): 81 Thermal current endurance, kA (s): 31.5 (3) Weight, kg: 106 Rated voltage 50 Hz, kV 6.3 (10) Insulation level Industrial frequency voltage tests 50 Hz, 1 min, kV 32 (42) Pulse voltage tests , kV 60 (75) Rated current A 630, 1250 Rated breaking current kA 25 31.5 Dynamic withstand current kA, instantaneous 64 81 Thermal withstand current kA, 3 s 25 31.5 Breaking current of the capacitor bank for rated. current 630 A A 440 Switching cycles O - 3 min - O - 3 min - O yes O - 0.3 s - O - 15 s - O yes O - 0.3 s - O - 3 min - O yes Time characteristics, ms contact opening 48 disconnection 70 activation 65 The number of disconnections is indicated at a short-circuit current of 25 kA. Operating conditions ■ climatic conditions: from -25 °C to +40 °C; ■ altitude above sea level: up to 1000 m. LF1 switches manufactured by Merlin Gerin (Schneider Electric) are three-phase SF6 switches for indoor installation, with a mechanical spring drive. LF1 switches are designed for switching rated currents and disconnecting short-circuit currents in power supply systems and electrical distribution networks of 6, 10 kV. The equipment complies with IEC 56 and GOST 687 standards. The circuit breaker uses the arc extinguishing principle, based on the arc rotation technique and the effect of thermal expansion of SF6 gas, which ensures reliable arc extinguishing when switching off rated currents (including capacitive and inductive), high currents short circuits, as well as a low level of switching overvoltages. The ability to turn off rated currents at rated voltage in case of chamber seal failure and zero excess pressure is guaranteed. Operation of the LF1 switch under rated technical conditions does not require maintenance of the mechanical drive for 10 years or 10,000 VO cycles. Maintenance of the arc-extinguishing chamber of the circuit breaker is not required during the entire service life. LF1 switches are designed and manufactured taking into account environmental protection requirements: materials, insulating and conductive components are environmentally friendly, replaceable and can be recycled; It is possible to extract SF6 gas from the chamber after dismantling the switch and reuse it after processing.
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