Siemens SIRIUS 3UG4 User Manual

Parallel connections of conductors
If several residual current monitoring relays are installed in one network, a conductor routed
through several residual current transformers must not be connected to itself downstream of
the transformer, as this would e󹪜ectively represent a parallel connection of the conductor. This
fault occurs particularly often with neutral conductors. This fault causes the currents to be
distributed across the conductor. This means that the current 󹪞owing through the load to be
monitored is no longer 100 % of the total current and all integrated monitoring relays measure
fault currents.
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9
Accessories
13.2 Accessories for 3UG4 monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 257

Siemens SIRIUS 3UG4 Specifications

General

Brand	Siemens
Model	SIRIUS 3UG4
Category	Relays
Language	English