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13.2.5
3UL23 residual current transformers for 3UG4625 monitoring relays
Description
3UL23 residual current transformers detect fault currents in machines and systems. Together
with the residual current monitoring relay or the 3UF7510 SIMOCODE motor management and
control device ground-fault module, residual current monitoring and ground-fault monitoring
are possible. The 3UL23 residual current transformer is available in six sizes with bushing
opening diameters of ∅ 35 mm, ∅ 55 mm, ∅ 80 mm, ∅ 110 mm, ∅ 140 mm, and ∅ 210 mm.
13.2.5.1
General information
Various circuit types with resulting fault currents
The following table shows various circuit types and the resulting fault currents in the event of a
ground fault. Circuits 1 to 6 create pure AC fault currents or AC fault currents with a pulsating
direct fault current component. This type of fault current can be detected by type A transformers
in accordance with DIN VDE 0100‑530, such as 3UL23 residual current transformers.
Note
3UG4.25 residual current monitoring relays are only suitable for use with 3UL23 residual current
transformers.
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
13.2 Accessories for 3UG4 monitoring relays
Accessories
249
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