6.6 to 36k, 1250A, 50kA
Breaks and makes on fault currents
Available with interlocked earth switch
Voltage indication system
Switches, Isolators, earth switches and combinations
Our switch disconnectors combine the functions of a switch and a disconnector in one device. As such, they are used for breaking load currents and have a short circuit making capability.
In combination with fuses, switch disconnectors can also be used to break short-circuit currents. The short-circuit current is interrupted by the fuses. Subsequently, the fuses trip the three poles of the switch disconnector, separating the faulty feeder from the power system.
Arc-Extinguishing Principle In switch disconnectors, the arc is not extinguished in a vacuum interrupter or SF6, but instead, operates according to the principle of a hard-gas switch. Effectively, the arc splits
off some gas from an insulating material which surrounds the arc closely. This gas quenches the arc promptly and effectively. As the material providing the gas cannot regenerate itself, the number of operating cycles is significantly lower than that of the vacuum interrupters.
Nevertheless, according to the hard-gas principle, switch disconnectors are the most frequently used item in many industries, as they have a good cost per performance relationship and give the customer a visual isolation point.