3RR2 current monitoring relays
4.3 Performance features of current monitoring relays
3UG4 / 3RR2 monitoring relays
50 Manual, 05/2016, NEB927043002000/RS-AC/004
Table 4- 5 Equipment of 3RR2 current monitoring relays
3RR21 Basic,
analog setting
3RR22 Standard,
digital setting
Reset function
• Enables manual or automatic resetting of the
monitoring relay
• Resetting directly on the device or by
disconnect
ing and reconnecting the supply voltage
(remote reset)
✓ ✓
ON-delay time
• Enables motor starting without evaluation of the
starting current
• Can be used to monitor motors with lengthy
startup
0 s to 60 s 0 to 99 s
Tripping delay time
• Prevents frequent warnings and disconnection in
response to currents in the vicinity of the
thresholds
• Permits brief violations of thresholds during
operation
0 s to 30 s 0 s to 30 s
Operating and
indicating elements
• For setting thresholds and delay times
• For selectable functions
• For fast and selective diagnostics
• Display for permanent indication of measured
values
LEDs and rotary
buttons
Display and buttons
Integrated contacts
• Allow the system or process to be shut down in
the event of an irregularity
• Can be used to output signals
1 CO contact 1 CO contact
1 semiconductor
output
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