Siemens 3UG4 User Manual

3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
289
3UG4641 cos phi and active current monitoring relay
11
11.1
Application areas
Application areas
The cos phi and active current monitoring relays are used, for example, in the following
application areas:
Table 11- 1 Application areas of the cos phi and active current monitoring relays
Function
Application
• No-load monitoring and load shedding
• Underload monitoring in the low-end
performance range
• Monitoring for overload
• Simple cos phi monitoring in power systems
for controlling compensation systems
• Cable break between the control cabinet
and the motor
• Fans (in the case of a broken fan belt, for
example)
• Pumps (in the case of an idling pump, for
example)
• Filter system (a contaminated filter system, for
example)
• Reactive power compensation
• Sawing system
• Conveyor belt
• Surface grinding machine
• Breaking mill
• Milling machine
• Car wash
• Lifting platform
• Screw conveyor
• Crane
• Turning machine
• Infrared heating system

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