The test unit is installed in a well insulated housing for easier handling and can be connected to the terminals of the type 8531 cable monitoring unit by means of a cable and plug or else to the terminals of the type 8532 and 8533 cable monitoring units by means of the couplers that are supplied.
The mobile test device is an auxiliary device allowing more efficient trouble shooting of non-contact overhead contact line switches of the type 8474.
Fuse links and overload release.
Often it is necessary to signal a switching state and only the traction voltage is available.