Siemens 3UG4 User Manual

System overview
3.3 Connection methods
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
23
3.3.2
Spring-loaded connection
Spring-loaded connection
All SIRIUS monitoring relays have spring-loaded connections. They make wiring quick and
maintenance-free, while also meeting high demands in terms of vibration and shock
resistance. If the cross-section of a connectable wire is greater than 6 mm², the forces
required for operation of the tension spring are so high that the spring-loaded connection can
no longer be used in a problem-free manner. For this reason, size S2 current monitoring
relays are only offered with screw-type or spring-loaded terminals in the control circuit. The
terminals of the main current paths are always screw-type terminals.
①
Solid
②
Finely stranded
③
Stranded
④
Finely stranded with end sleeve
a
Spring-loaded terminal
b
Busbar
Image 3-1 Spring-loaded terminal
The conductors can be clamped directly or you can pre-treat them to add a form of splice
protection. This could involve attaching end sleeves or pin cable lugs to the ends of the
conductors; the tidiest solution is to use conductors whose ends have been sealed by means
of ultrasound.

Siemens 3UG4 Specifications

General

Type of voltage	AC/DC
Number of CO contacts for auxiliary contacts	1
Number of NC contacts delayed	0
Number of NO contacts delayed	0
Number of change-over switches delayed	0
Number of NC contacts undelayed	0
Number of NO contacts undelayed	0
Number of change-over switches undelayed	1
Width	22.5 mm
Housing Width	22.5 mm
Operating Temperature	-25 ... 60 °C
Protection Class	IP20
Design of the product	Monitoring relay
Type	Monitoring relay
Operating frequency rated value	50 ... 60 Hz
Rated Operational Current	0.1 ... 10 A
Adjustable response value current	0.1 ... 10 A
Contact Configuration	1 CO contact
Operating range factor control supply voltage rated value at AC	0.8-1.1 x Un
Operating range factor control supply voltage rated value at DC	0.8-1.1 x Un