SIEMENS
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Siemens IC 10 · 2017
Overload Relays
SIRIUS 3RB3 Electronic Overload Relays
3RB30, 3RB31 for standard applications
7
Article No. scheme
Note:
The Article No. scheme shows an overview of product versions
for better understanding of the logic behind the article numbers.
For your orders please use the article numbers quoted in the
selection and ordering data.
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Benefits
The most important features and benefits of the 3RB30/3RB31
electronic overload relays are listed in the overview table
(see "General Data" page 7/71 onwards)
.
Advantages through energy efficiency
Overview of the energy management process
We offer you a unique portfolio for industrial energy manage-
ment, using an energy management system that helps to opti-
mally define your energy needs. We split up our industrial
energy management into three phases – identify, evaluate, and
realize – and we support you with the appropriate hardware and
software solutions in every process phase.
The innovative products of the SIRIUS industrial controls port-
folio can also make a substantial contribution to a plant's energy
efficiency
(see www.siemens.com/sirius/energysaving)
.
3RB30/3RB31 electronic overload relays contribute to energy
efficiency throughout the plant as follows:
•
Reduced inherent power loss
•
Less heating of the control cabinet
•
Smaller control cabinet air conditioners can be used
■
Application
Industries
The 3RB30/3RB31 electronic overload relays are suitable for
customers from all industries who want to guarantee optimum in-
verse-time delayed protection of their electrical loads (e.g. mo-
tors) under normal and heavy starting conditions (CLASS 5E to
30E), minimize project completion times, inventories and energy
consumption, and optimize plant availability and maintenance
management.
Application
The 3RB30/3RB31 electronic overload relays have been de-
signed for the protection of three-phase motors in sinusoidal
50/60 Hz voltage networks. The relays are not suitable for the
protection of single-phase AC or DC loads.
The 3RU21 thermal overload relay or the 3RB22/3RB23/3RB24
electronic overload relay can be used for single-phase
AC loads. For DC loads we recommend the 3RU21 thermal
overload relay.
Ambient conditions
The devices are insensitive to external influences such as
shocks, corrosive ambient conditions, ageing and temperature
fluctuations.
For the temperature range from –25 °C to +60 °C, the
3RB30/3RB31 electronic overload relays compensate the
temperature in accordance with IEC 60947-4-1.
Use of SIRIUS protection devices in conjunction with
IE3/IE4 motors
Note:
For the use of 3RB30/3RB31 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.
Product versions
Article number
Electronic overload relays
3RB3
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Device type
e. g. 0 = standard device, with internal
supply, for three-phase loads
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Size, rated operational current and
power
e. g. 1 = 16 A (7.5 kW) for size S00
@
Version of the automatic RESET,
electrical remote RESET
e. g. 6 = switchable between
manual/auto RESET
@
Trip class (CLASS)
e. g. 1 = CLASS 10E
@
Setting range of the overload release
e.g. R = 0.1 ... 0.4 A
@
Connection methods
e.g. B = screw terminals for main and
auxiliary circuits
@
Installation type
e. g. 0 = mounting on contactor
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Example
3RB3
0
1
6
–
1
R
B
0
IC01_00244
© Siemens AG 2016