Equipment - Siemens SIRIUS 3RT Series System Manual

8.10.1.3

Equipment

Table 8- 16 Equipment of 3RR2 current monitoring relays
Feature
Reset function
ON-delay time
Tripping delay time
Operator controls and displays
Integrated contacts
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
Benefit
Enables manual or automatic

resetting of the relay
Resetting directly on the device or

by disconnecting and reconnecting
the supply voltage (remote reset)
Enables motor starting without

evaluation of the starting current
Can be used to monitor motors with

lengthy startup
Prevents frequent warnings and

disconnection in response to
currents in the vicinity of the
threshold values
Permits brief violations of threshold

values during operation
For setting threshold values and

delay times
For selectable functions

For fast and selective diagnostics

Display for permanent indication of

measured values
Allow the system or process to be

shut down in the event of an
irregularity
Can be used to output signals

SIRIUS 3RR2 current monitoring relays
8.10 Technical data
3RR21 Basic, 3RR22 Standard,
analog setting digital setting
✓
0 s to 60 s 0 to 99 s
0 s to 30 s 0 s to 30 s
LEDs and rotary Display and buttons
potentiometers
1 CO contact 1 CO contact
1 semiconductor
output
✓
735