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This safety device comprises the following combination:
In a fuse combination, both earthing switches are mechanically interconnected , allowing simultaneously opening and closing.
The opening and closing device of the RV44 load-break switch and the EM 20 earthing switch have been fitted in a single drive mechanism. Both switches have their own, separate operating shaft. These operating shafts are mechanically interlocked, thereby preventing any faulty operation.
Hitting bolts connected to a shaft on the top of the fuse ensure that the load-break switch opens, in case of the blowing of a fuse.