Siemens 3UG4 User Manual page 340

Industrial controls monitoring and control devices

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13.2 Accessories for 3UG4 monitoring relays

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)

Shield sleeve

Residual current transformer

3UG4 / 3RR2 monitoring relays

Manual, 05/2016, NEB927043002000/RS-AC/004

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