Huge electrical switch

Here is picture of huge electrical switching device I saw today. I believe it is going to be installed inside or next to a big data center. I belive that this is made for controlling several megawatts of three phase 110 kV power. It seems to be made by ABB.


  1. Tomi Engdahl says:

    Circuit Breaker Testing

    Circuit breakers allow the flow of energy to be controlled by safely switching currents on and off at all voltage levels of the energy grid. The interrupter and the mechanical drive are the main components that are subject to wear and aging. In order to ensure the proper operation of a circuit breaker throughout its lifetime, diagnostic tests are performed, such as resistance, timing, minimum pick-up, travel, and power factor.

  2. Tomi Engdahl says:

    Isolating a Disconnecting Circuit Breaker using live line working

    As it becomes more and more common with live working, performed by special trained staff, the question has been raised if it is possible to use the manual links in the DCB-design for live working.
    In a plant taken into service, a test was performed, where a DCB first was linked off from the live switchgear and then reconnected. The test was documented in this video film.
    Learn more about disconnecting circuit breakers from ABB:

    Important notice:
    This is carried out by the national distribution company in Sweden, thus following all applicable laws and regulation.


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