SIEMENS
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Siemens IC 10 · 2017
Overload Relays
SIRIUS 3RB2 Electronic Overload Relays
3RB24 for IO-Link for high-feature applications
7
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Application
Industries
The 3RB24 electronic overload relays are suitable for customers
from all industries who want to guarantee optimum current and
temperature-dependent protection of their electrical loads
(e.g. motors) under normal and heavy starting conditions
(CLASS 5E to 30E), minimize project completion times, invento-
ries and energy consumption, and optimize plant availability and
maintenance management.
Application
The 3RB24 electronic overload relays have been designed for
the protection of three-phase asynchronous and single-phase
AC motors.
In addition to protection function, these devices can be used
together with contactors as direct or reversing starters
(star-delta (wye-delta) start also possible), which are controlled
via IO-Link. This makes it possible to directly control drives via
IO-Link from a higher-level controller or on site via the optional
hand-held device and also, for example, to return current values
directly via IO-Link.
If single-phase AC motors are to be protected by the 3RB24
electronic overload relays, the main current paths of the current
measuring modules must be series-connected.
(Circuit Diagrams
see Manual
).
Ambient conditions
The devices are insensitive to external influences such as
shocks, corrosive ambient conditions, ageing and temperature
fluctuations.
In the temperature range from -25 °C to +60 °C, the
3RB24 electronic overload relays compensate the temperature
in accordance with IEC 60947-4-1.
Configuration notes for use of the devices below –25°C or above
+60°C on request.
Use of SIRIUS protection devices in conjunction with
IE3/IE4 motors
Note:
For the use of 3RB24 electronic overload relays in conjunction
with highly energy-efficient IE3/IE4 motors, please observe the
information on dimensioning and configuring,
see Application
Manual
.
For more information,
see Preface on page 7
.
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Technical specifications
The following technical information is intended to provide an
initial overview of the various types of device and functions.
More information
Application Manual "SIRIUS Controls with IE3/IE4 Motors",
see
Configuration Manual "Configuring SIRIUS Innovations – Selection Data for
Fuseless and Fused Load Feeders"
, see
Manual "SIRIUS 3RB24 Electronic Overload Relay for IO-Link",
see
Technical specifications,
see
Type – Overload relay: evaluation modules
3RB2483-4A.1
Size contactor
S00 ... S10/S12
Dimensions of evaluation modules
(W x H x D)
mm
45 x 111 x 95
General data
Tripping in the event of
Overload, phase failure and phase asymmetry (> 40 % according to NEMA),
+ ground fault (connectable and disconnectable) and activation of the thermistor
motor protection (with closed PTC sensor circuit)
Trip class
acc. to IEC 60947-4-1
CLASS
5E, 10E, 20E and 30E adjustable
Phase failure sensitivity
Yes
Overload warning
Yes, from 1.125 x
I
e
for symmetrical loads
and from 0.85 x
I
e
for unsymmetrical loads
Reset and recovery
• Reset options after tripping
Manual and automatic RESET, electrical remote RESET or through IO-Link
• Recovery time
-
For automatic RESET
min.
- For tripping due to overcurrent: 3 (stored permanently),
- For tripping by thermistor: Time until the motor temperature has fallen 5 K
below the response temperature,
- For tripping due to a ground fault: no automatic RESET
-
For manual RESET
min.
- For tripping due to overcurrent: 3 (stored permanently),
- For tripping by thermistor: Time until the motor temperature has fallen 5 K
below the response temperature,
- For tripping due to a ground fault: Immediately
-
For remote RESET
min.
- For tripping due to overcurrent: 3 (stored permanently),
- For tripping by thermistor: Time until the motor temperature has fallen 5 K
below the response temperature,
- For tripping due to a ground fault: Immediately
W
H
D
© Siemens AG 2016