Siemens 3UG4 - 3.5 Overview of the functions

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