Vacuum Breaker Up-right Switch
This switch is used for both arc furnace and capacitor switching and is generally known by the Joslyn Hi-Voltage* trademark VBU* because there is no other widely known generic name for this switch.
The 2000 and 3000 A modules are original products of the Vacuum Electric Switch Co. and are used for very large arc furnaces at 34 kV. At 69 kV and above this switch may be the only switch available with a practical operating life for switching arc furnaces.
A mechanical operating life of 200,000 operations is practical between module and switch mechanism rebuilds. The Vacuum Electric Switch Co. remanufactures Joslyn’s VBU* modules and switch operating mechanisms.
The Vacuum Electric Switch Co. builds a special control for switching VBU* switches for both capacitor and arc furnace switching applications. Controls are available that can switch six VBU* poles in parallel or a total of eighteen switches. Vacuum Electric Switch remanufactured VBU*modules and VBU*switch mechanisms are shown here. Controls are shown here.
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