Siemens 3UG4 User Manual

System overview
3.5 Overview of the functions
3UG4 / 3RR2 monitoring relays
36 Manual, 05/2016, NEB927043002000/RS-AC/004
3.5
Overview of the functions
3.5.1
3RR2 current monitoring relays
Table 3- 16 Functions of the 3RR21 / 3RR22 current monitoring relays for analog and digital setting
Function
Current monitoring relay
3RR21
3RR22
Current monitoring
Monitoring for undercurrent
2p
3p
Monitoring for overcurrent
2p
3p
Apparent current monitoring
✓
✓
Active current monitoring — ✓
Range monitoring
2p
3p
Monitoring for phase failure, wire break 2p 3p
Monitoring for phase sequence
—
✓
Internal ground-fault detection (fault current monitoring)
—
✓
Blocking current monitoring
—
✓
Supply voltage
Self-powered, without auxiliary voltage
—
—
Externally powered, with auxiliary voltage
✓
✓
✓
: Function available
2p: Monitoring is 2
-phase
3p: Monitoring is 3
-phase
— : Function not available

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