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Reliable Power Switching and Motor Starting Solutions for the Mining Industry

Due to the hazardous nature of the mining industry, reliable power switching and motor starting is critical. Vacuum contactors help control motors in underground mining equipment. However, vacuum contactors will withstand the elements both inside and outside the mine.

Typically, machine builders work with our experts to custom-build vacuum contactors to meet the unique requirements of their mine application. Joslyn Clark vacuum contactors are highly respected in applications including:

  • Longwall mining equipment (shearers, crushers, and stage loaders)
  • Continuous miners
  • Conveyors
  • Power Centers
  • Shuttle Cars
  • Other Related Equipment
A longwall shearer, illustrated above, is a robust piece of equipment with two cutting drums used to shear coal from the inside of the underground mine. A Joslyn Clark MVC Series vacuum contactor is housed in the control panel of the longwall shearer to switch the motor on/off based on the operator's predetermined setting.

The Joslyn Clark line of low and medium voltage vacuum contactors provides a compact design with unique features and numerous safety benefits, resulting in a simple, safe, and maintenance-free starter for the mining industry.

  • Available in NEMA sizes 4, 5, and 6, Joslyn Clark's series of USAVAC® vacuum contactor products enclose the power contacts inside a vacuum chamber. This design feature makes the vacuum contactor more resistant to harsh environments, compact, quiet, and long-lived.
  • Fully phase insulated. All materials that go into a Joslyn Clark vacuum contactor are subject to rigorous chemical and analytical testing. Our vacuum contactor uses high alumina ceramics for their high temperature and favorable out-gassing characteristics.
  • Additionally, our proprietary contact material is proven for superior transient voltage generation control.
Joslyn Clark's CV, VC, and MVC contactors ensure safe and dependable start-up and operation of mining equipment. Spanning the medium voltage range from 600V through 1.5 kV (CV Series), <3.6 kV (VC Series), and <7.2 kV (MVC Series), Joslyn Clark has the contactor and motor starter system solution to address your needs.
Featured Products

CV Series Compact Vacuum Contactor

Voltage: Up to 1.5kV  |  Amperage 200,400,600 max | <1A Chopping Current  |  Auxiliary Contacts  |  Opening Time 120ms  |   Closing Time 20-40ms

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CV Series Vacuum Contactor

VC Series Low & Medium Voltage Vacuum Contactor

Voltage: Up to 3.6kV  |  Amperage 600 max | <1A Chopping Current  |  Auxiliary Contacts  |  Opening Time 90ms  |  Closing Time 17ms

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VC Series Low Voltage Vacuum Contactor

MVC Series Medium Voltage Vacuum Contactor

Voltage: Up to 7.2kV  |  Amperage 600 max | <1A Chopping Current  |  Auxiliary Contacts  |  Opening Time 90ms  |   Closing Time 40ms

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MVC Series Medium Voltage Vacuum Contactor