Siemens SIRIUS 3RF Series

SIRIUS 3RR2 current monitoring relays
8.10 Technical data
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
735
8.10.1.3 Equipment
Table 8- 16 Equipment of 3RR2 current monitoring relays
Feature Benefit 3RR21 Basic,
analog setting
3RR22 Standard,
digital setting
Reset function
 Enables manual or automatic
resetting of the relay
 Resetting directly on the device or
by disconnecting 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
threshold values
 Permits brief violations of threshold
values during operation
0 s to 30 s 0 s to 30 s
Operator controls and displays
 For setting threshold values and
delay times
 For selectable functions
 For fast and selective diagnostics
 Display for permanent indication of
measured values
LEDs and rotary
potentiometers
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