SIEMENS
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Siemens IC 10 · 2017
Relays
SIRIUS 3RR21, 3RR22 Monitoring Relays for Mounting onto 3RT2 Contactors
Current and active current monitoring
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Overview
SIRIUS 3RR2242, 3RR2142, 3RR2243 current monitoring relays
The SIRIUS 3RR2 current monitoring relays are suitable for load
monitoring of motors or other loads. In 2 or 3 phases they monitor
the rms value of AC currents for overshooting or undershooting
of set threshold values.
Whereas apparent current monitoring is used above all in con-
nection with the rated torque or in case of overload, the active
current monitoring option can be used to observe and evaluate
the load factor over a motor's entire torque range.
The 3RR2 current monitoring relays can be integrated directly in
the feeder by mounting onto the 3RT2 contactor; separate wiring
of the main circuit is therefore superfluous. No separate trans-
formers are required.
For a line-oriented configuration or simultaneous use of an
overload relay, terminal supports for stand-alone installation are
available for separate standard rail mounting.
Versions
Basic versions
The basic versions with two-phase apparent current monitoring,
a CO contact output and analog adjustability provide a high
level of monitoring reliability especially in the rated and overload
range.
Standard versions
The standard versions monitor the current in three phases with
selectable active current monitoring. They have additional diag-
nostics options such as residual current monitoring and phase
sequence monitoring, and they are also suitable for monitoring
motors below the rated torque. These devices have an addi-
tional independent semiconductor output, an actual value indi-
cator, and are digitally adjustable.
Both versions are available optionally with screw or spring-type
terminals, in each case for sizes S00 and S0. With variants of
size S2 the main current paths always have screw terminals; the
control current side can have screw or spring-type terminals.
Note:
In addition to the features of the standard versions,
3RR24 monitoring relays for mounting onto 3RT2 contactors
for IO-Link also offer the possibility of transmitting the measured
values and diagnostics data to a controller via an IO-Link.
Furthermore, the devices can be parameterized on the devices
themselves or via IO-Link.
For more information,
see page 10/70 onwards
.
3RR21 and 3RR22 overview table
More information
Home page,
see www.siemens.com/relays
Industry Mall,
see www.siemens.com/product?3RR21
Features
3RR21
3RR22
Benefits
General data
Sizes
Dimensions in mm
(W x H x D)
• Screw terminals
• Spring-type terminals
S00, S0, S2
S00: 45 x 79 x 80,
S0: 45 x 87 x 91,
S2: 55 x 99 x 112
S00: 45 x 90 x 80,
S0: 45 x 109 x 92,
S2: 55 x 99 x 112
S00, S0, S2
S00: 45 x 79 x 80,
S0: 45 x 87 x 91,
S2: 55 x 99 x 112
S00: 45 x 90 x 80,
S0: 45 x 109 x 92,
S2: 55 x 99 x 112
• Are coordinated with the dimensions, connections
and technical characteristics of the other devices in the
SIRIUS modular system (contactors, soft starters, etc.)
• Permit the mounting of slim-line and compact load
feeders in widths of 45 mm (S00 and S0) and 55 mm
(S2)
• Simplify configuration
Current range
S00: 1.6 ... 16 A
S0: 4 ... 40 A
S2: 8 ... 80 A
S00: 1.6 ... 16 A
S0: 4 ... 40 A
S2: 8 ... 80 A
• Is adapted to the other devices in the SIRIUS modular
system
• Just a single version per size with a wide setting range
enables easy configuration
Permissible ambient temperature
During operation
-25 ... +60 °C
-25 ... +60 °C
• Suitable for applications in the control cabinet,
worldwide
W
H
D
© Siemens AG 2016