The distinctive feature of the JBPVU (Box with a block "Fuse-Switch") is a movable block with fuses, performing the function of a movable contact. The power conductors are connected to the fixed contacts of the fuse base.
Disconnection of the power circuit is provided by a double visible break. The mechanism of switching on - switching off of NBPVU for 250A and 400A is own development, protected by the patent of the Russian Federation for "Useful Model", the essence of which is simplicity and reliability
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