Typical use: in TN-C, TN-S, TT- or IT-systems with connection type CT1 (4+0, 3+0 and 2+0) or with connection type CT2 (1+1 or 3+1 connection) according to HD 60364-5-534.
They are generally installed as close as possible to the origin of the installation, e.g. in Main Distribution Boards (MDBs), as well as in Sub Distribution Boards (SDBs).
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