Inspire the IMext High Voltage Products | Air-insulated switchgear Product information The EDF SK is a live tank SF6 Auto-pufferTM circuit breaker designed for 36 kV - 72.5 kV range and with a rated breaking current up to 31.5 kA. The circuit breaker is operated with one operating mechanism. Design The circuit breaker pole includes the breaking unit, the support insulator and the pole linkage housing. The three-poles of the breaker are mounted on a common support frame with the operating mechanism arranged below the same frame. The three breaker poles have a common gas system. The operating reliability and service life of an SF6 circuit breaker depends on the maintenance of SF6 gas pressure and neutralization of the effects of moisture and decomposed products in the gas. The above is achieved by: • Double O-rings of Nitrile rubber used for sealing purposes with excellent results • Each breaking unit is provided with an absorber that absorbs moisture and gaseous decomposed products • Interruption capability is a function of SF6 gas density. A density monitor consisting of a temperature-independent pressure switch is provided in the circuit breaker • An alarm signal is triggered when pressure drops due to loss of gas Features and advantages The EDF SK circuit breaker is based on the latest developments in arc research and offers the following advantages: • Interruption of capacitive currents with very low probability of re-strike due to optimized contact design and movement • Low over-voltages when switching inductive currents due to optimum quenching at current zero • High dielectric strength even when SF6 gas is at atmospheric pressure due to wide contact gap • Low operating energy - reduced mechanical stress on breaker and low reaction forces on the foundation • High seismic capability due to optimized pole and structure design

Reliable spring operating mechanism, type FSA The circuit breaker is operated by a motor charged spring operating mechanism, which is tested for IP 55 class. • High reliability and low maintenance • Reliable and optimized latch system Options • Brown/gray porcelain insulators • Polymer (composite) insulators Quality and sustainability To ensure consistent and high product quality all components are subjected to stringent quality tests prior to manufacturing. For sustainable and trouble-free functioning, comprehensive electrical and mechanical routine tests are carried out on the poles and operating...