Siemens SIRIUS 3UG4 User Manual

Routing contrary to the current 󹪞ow
To be able to form the vectorial sum of currents to and from a load correctly, all active conductors
must be routed through the residual current transformer from the same direction. Due to the
restricted space in a control cabinet it may be easier to route the neutral conductor through the
transformer in the opposite direction to the phase conductor. This means the vectorial sum of
currents does not equal zero, even without a ground fault, and the residual current monitoring
relay trips.
9
:


/
/
/
1
,
*

,
*

,
*
,
*

,
*

,
*

,
*

,
*

13.2.5.5 Internal circuit diagram
3UL23 internal circuit diagram
///1
6
6
Figure 13-10 3UL23 residual current transformer
Accessories
13.2 Accessories for 3UG4 monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 259

Siemens SIRIUS 3UG4 Specifications

General

Brand	Siemens
Model	SIRIUS 3UG4
Category	Relays
Language	English