3RR2 current monitoring relays
4
4.1 Product description
Overview
SIRIUS 3RR2 current monitoring relays are suitable for current monitoring of motors or other
loads. They are capable of two-phase or three-phase monitoring of the rms value of AC currents,
checking that the values do not overshoot or undershoot set thresholds.
SIRIUS 3RR2 current monitoring relays are available in the following variants:
• Basic version (3RR21): with analog setting using rotary buttons, two-phase monitoring and
CO contact.
• Basic version (3RR22): digital setting via a display, 3-phase monitoring, CO contact, and
semiconductor output; also monitors phase sequence, phase failure, ground fault and
blocking current
• Version for IO-Link (3RR24): same as standard version, but additionally with IO-Link interface
for direct interfacing to a PLC for remote parameterization, remote diagnostics, cyclic transfer
of measured values, support of the parameter server functionality of IO-Link (with master as
from specication V1.1), with integrated runtime and switching cycle counter
You can nd further information in the Manual "3UG48/3RR24 Monitoring Relays for IO-Link".
Whereas apparent current monitoring is primarily used in the rated torque range or for overload,
active current monitoring can be used to observe and evaluate the degree of loading across a
motor's entire torque range.
Apparent current monitoring and active current monitoring are described in more detail in the
Chapter "Parameters (Page 281)".
System integration
3RR2 current monitoring relays are available in three sizes, S00, S0 and S2. 3RR2 current
monitoring relays are matched to 3RT2 contactors and 3RF34 (size S0) solid-state contactors in
terms of their electrical and mechanical features. They can be integrated in the feeder by means
of direct mounting. This eliminates the need for the main circuit to be wired separately and no
additional transformers are required.
For a stand-alone assembly or if an overload relay is being used at the same time, terminal
supports for stand-alone assembly are available for separate DIN rail mounting.
3RR2 current monitoring relays were conceived for monitoring 3-phase systems.
Depending on the device version used, monitoring of 1- or 2-phase AC systems is possible with
the following wiring variants:
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 49
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