Siemens 3UG4 - Page 337

Accessories
13.2 Accessories for 3UG4 monitoring relays
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
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Route power cables around the residual current transformer in a straight line and ensure the
area corresponds at minimum to the internal transformer diameter.
X > ∅ residual current transformer
The internal transformer diameter must be at minimum twice the size of the power cable
bundle diameter.
∅ a ≥ 2 x ∅ b