Accessories
13.2 Accessories for 3UG4 monitoring relays
3UG4 / 3RR2 monitoring relays
340 Manual, 05/2016, NEB927043002000/RS-AC/004
b) A solid shield sleeve, e.g. turned from a normal, low-carbon tool steel must be
precisely in contact with the internal ring of the residual current transformer. The wall
thickness of the sleeve must be 1 mm at minimum, the length of the sleeve (L) must
correspond to the internal diameter of the transformer used.
Phase (and neutral conductor)
Residual current transformer
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