Siemens SIRIUS 3RN2 User manual

Manual
3RN2 Thermistor motor protection relay
Monitoring and control devices
Edition 10/2016
siemens.com
SIRIUS

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SIRIUS
Monitoring and control devices
SIRIUS 3RN2 thermistor motor
protection relay
Manual
10/2016
A5E34244868002A/RS
-AA/001
Introduction
1
Safety notes
2
ATEX
3
Description
4
Mounting
5
Connection
6
Functions
7
Alarm, error and system
messages
8
Technical data
9
CAx data
10
Dimension drawings
11
Circuit diagrams
12
Spare parts/accessories
13

Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
3ZX1012-0RN20-1AC1
Ⓟ
10/2016 Subject to change
Copyright © Siemens AG 2016.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

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Manual, 10/2016, A5E34244868002A/RS-AA/001 5
Table of contents
1 Introduction............................................................................................................................................. 7
1.1 Required basic knowledge........................................................................................................7
1.2 Service&Support .......................................................................................................................7
1.3 DataMatrix code......................................................................................................................10
1.4 Standards/Regulations/Approvals ..........................................................................................11
1.5 Declaration of conformity ........................................................................................................11
1.6 Article No. scheme..................................................................................................................12
2 Safety notes.......................................................................................................................................... 13
2.1 General safety notes...............................................................................................................13
2.2 Intended use ...........................................................................................................................14
2.3 Current information about operational safety .........................................................................14
3 ATEX.................................................................................................................................................... 15
3.1 Safety and commissioning instructions for hazardous areas .................................................15
3.2 Use in areas subject to an explosion hazard due to gases or dust ........................................19
4 Description............................................................................................................................................ 21
4.1 Device overview......................................................................................................................21
4.2 Device description...................................................................................................................21
4.3 Device versions.......................................................................................................................25
4.4 Special features ......................................................................................................................25
4.5 Area of application ..................................................................................................................26
5 Mounting............................................................................................................................................... 27
5.1 Warning notices ......................................................................................................................27
5.2 Terminal coding ......................................................................................................................28
5.3 Mounting the devices on a standard mounting rail .................................................................29
5.4 Disassembling devices from a standard mounting rail ...........................................................30
5.5 Mounting the devices on a wall...............................................................................................31
5.6 Removing the devices from the wall .......................................................................................32

Table of contents
SIRIUS 3RN2 thermistor motor protection relay
6Manual, 10/2016, A5E34244868002A/RS-AA/001
6 Connection ........................................................................................................................................... 33
6.1 Terminal assignment.............................................................................................................. 33
6.2 Connection data for terminals ................................................................................................ 38
6.3 Connecting the screw-type terminals..................................................................................... 39
6.4 Disconnecting the screw-type terminals ................................................................................ 40
6.5 Wiring rules for spring-loaded terminals (with push-in technology) ....................................... 41
6.6 Connect the spring-loaded terminal (push-in)........................................................................ 42
6.7 Disconnect the spring-loaded terminal (push-in) ................................................................... 44
6.8 Attaching the terminals .......................................................................................................... 45
6.9 Removing the terminals ......................................................................................................... 46
7 Functions.............................................................................................................................................. 47
8 Alarm, error and system messages ....................................................................................................... 51
8.1 Function charts....................................................................................................................... 51
8.2 LED displays .......................................................................................................................... 54
9 Technical data ...................................................................................................................................... 57
9.1 Technical data in Siemens Industry Online Support.............................................................. 57
10 CAx data............................................................................................................................................... 59
11 Dimension drawings.............................................................................................................................. 61
12 Circuit diagrams.................................................................................................................................... 65
13 Spare parts/accessories........................................................................................................................ 67
Index .................................................................................................................................................... 69

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Manual, 10/2016, A5E34244868002A/RS-AA/001 7
Introduction
1
1.1
Required basic knowledge
Basic knowledge of low-voltage industrial controls is required to understand this manual.
WARNING
Qualified personnel required
All work involved in connecting, commissioning, and maintenance must be performed by
qualified, responsible
personnel.
Improper handling may result in serious
personal injury and considerable damage to
property
.
1.2
Service&Support
Online Support
The Online Support in the Service&Support portal is an extensive information system for all
questions relating to Siemens products and solutions. This service enables direct and central
access to in-depth information concerning the products, systems and applications for
industry and to a large number of programming, configuration, and application examples. Its
content is available via a mobile app.
The Technical Forum of the Online Support provides the opportunity for users to swap
information. Support Request allows contact to be established with Siemens experts in
Technical Support.
Siemens Industry Online Support ensures that users in industry are always kept up-to-date
with news, software updates and announcements by means of newsletters and Twitter.
Links:
Service&Support Portal (http://support.automation.siemens.com), Online Support
(http://support.automation.siemens.com/WW/view/en/16605022)

Introduction
1.2 Service&Support
SIRIUS 3RN2 thermistor motor protection relay
8Manual, 10/2016, A5E34244868002A/RS-AA/001
Product Support
Are you looking for product information such as technical data, updates or FAQs? The
"Product Support" section of the Service&Support portal offers an extensive collection of all
information about the Siemens Industry Automation and Drive Technologies products and
solutions:
●Answers to frequently asked questions (FAQs)
●Updates/upgrades, service packs, and support tools for downloading
●Manuals and operating instructions
●Technical specifications/CAx data
●Approvals and certificates
●Test certificates and characteristic curves
All Product Support information is at your disposal free of charge and around the clock, and
you always get the current version.
Link:
Product Support (http://support.automation.siemens.com/WW/view/en/4000024)
CAx data
The CAx Download Manager provides you with a simple means of gaining access to up-to-
date product data for your CAx or CAe system.
You configure your own download package with just a few clicks. You can choose from the
following information for products:
●Product images
●2D dimensional drawings
●3D models
●Internal circuit diagrams
●EPLAN macro files
●Manuals
●Characteristics
●Operating instructions
●Certificates
●Product master data
Link:
CAx Download Manager
(http://support.automation.siemens.com/WW/view/en/42455541)

Introduction
1.2 Service&Support
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 9
Applications & Tools
Applications & Tools supports you with various tools and examples when it comes to solving
your automation tasks. Solutions are presented as the interaction between several
components in the system, without focusing on individual products:
●Application examples
●Function blocks & tools
●Background and system descriptions
●Performance statements
●Demonstration systems/videos
Link:
Applications & Tools (https://support.industry.siemens.com/cs/ww/en/sc/2054)
My Documentation Manager
The My Documentation Manager enables you to put together your own documentation from
our standard documents (manuals), which are located in the product support Under
mySupport, you have the opportunity to create and manage you own compilations in a
structure of their own.
Link:
My Documentation Manager
(http://support.automation.siemens.com/WW/view/en/38715968)

Introduction
1.3 DataMatrix code
SIRIUS 3RN2 thermistor motor protection relay
10 Manual, 10/2016, A5E34244868002A/RS-AA/001
1.3
DataMatrix code
A DataMatrix code is lasered onto the lower terminal cover of all devices of this series.
DataMatrix codes are standardized in ISO/IEC 16022. The DataMatrix codes on Siemens
devices use ECC200 coding.
The following device information is encoded in the DataMatrix codes as a bit stream:
●Article number
●Serial number
This information is stored in the following format in the DataMatrix code:
1P
Article number
+
S
Serial number
Data identifier Net content Separator Data identifier Net content
Note
The information content is displayed without spaces.
This machine-readable information simplifies and accelerates handling of the respective
devices.
As well as fast access to the serial numbers of the respective devices for unique
identification, the DataMatrix codes simplify communication with Siemens Technical Support.
SIEMENS Industry Support App
DataMatrix codes primarily enable extremely fast and convenient access to all device-
specific information relating to an article number in the SIEMENS Service&Support Portal
(http://support.automation.siemens.com), such as operating instructions, manuals, data
sheets, FAQs, etc.
We provide the SIEMENS Industry Support app free of charge for this purpose and it can be
used on most commercially available smart phones and tablets.
The SIEMENS Industry Support app is available for iOS and Android-based devices and can
be accessed via the following links:
Link for Android
Link for iOS
Link for Windows Phone

Introduction
1.4 Standards/Regulations/Approvals
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 11
1.4
Standards/Regulations/Approvals
Standards
The SIRIUS 3RN2 thermistor motor protection relays comply with the following standards:
●EN 60947-8 "Low-voltage switchgear and controlgear - Control units for built-in thermal
protection (PTC) for rotating electrical machines"
●EN 50495 "Safety devices required for the safe functioning of equipment with respect to
explosion risks"
UL/CSA/Shipbuilding approval
SIRIUS components have been approved by a whole range of bodies for various sectors
(e.g. shipbuilding).
You will find the the current list of approvals in the Monitoring and Control Devices chapter of
Catalog IC 10 - "SIRIUS Industrial Controls” (www.siemens.com/industrial-controls/catalogs).
Further information and certificates are available for download on the Internet
(https://support.industry.siemens.com/cs/ww/en/ps).
1.5
Declaration of conformity
The manufacturer declares that the thermistor motor protection relays of the SIRIUS 3RN2
series in the designs marketed by us comply with the applicable basic safety and health
requirements of the EC Directives* stated (including amendments) and that the stated
standards* were applied in their design and construction.
* You can download the complete EC Declaration of Conformity from the Service Portal
(https://support.industry.siemens.com/cs/ww/en/ps/16027/cert) in PDF format.

Introduction
1.6 Article No. scheme
SIRIUS 3RN2 thermistor motor protection relay
12 Manual, 10/2016, A5E34244868002A/RS-AA/001
1.6
Article No. scheme
Note
The Article No. scheme is for illustrative purposes only and for better understanding of the
logic behind the
article numbers.
For your orders, please use the article numbers quoted in the catalog in the Selection and
ordering data.
Table 1- 1 Article No. scheme
Digit of the Article No.
1 - 3
4
5
6
7
8
9
10
11
12
SIRIUS thermistor
motor protection relay
3 R N
☐
☐
☐
☐
-
☐
☐
☐
☐
0
Generation
☐
-
2
Generation
Sensor type
☐
-
0
Type A PTC
Number/type of sensor
circuits
☐- 0 1 sensor circuit, supply voltage = relay
output voltage
1
1 sensor circuit
2
2 sensor circuits for warning and tripping
Resetting and further
functions
☐-
0
Automatic reset
1 Manual reset, with wire-break and short-
circuit detection
2 Manual/auto/remote reset, non-volatile,
with wire-break and short-circuit
detection
3 Manual/auto/remote reset, non-volatile,
with wire-break and short-circuit
detection, with protective separation
Connection system - ☐
1
Screw terminal
2
Spring-loaded terminal (push-in)
Output relay - ☐
A
1 CO contact
B
2 CO contacts
C
1 NO contact + 1 NC contact
D
1 NO contact + 1 CO contact
G 2 CO contacts, hard gold-plated
Supply voltage - ☐
A
24 V
W
24 … 240 V
Waveform of the
supply voltage
- ☐
3
50/60 Hz AC/DC
4
DC
Relay response to
power failure
☐
0
Monostable
1
Bistable
8
Special versions
Example
3 R N
2
0
0
0
-
1
A
A
3
0
SIRIUS thermistor motor protection
relay, 2nd generation, type A PTC, 1
sensor circuit, automatic reset, screw-
type terminals, 1 CO, 24 V, 50/60 Hz
AC/DC, monostable

SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 13
Safety notes
2
2.1
General safety notes
Note
Recycling and disposal
Dispose of existing packing material in accordance with applicable regulations or recycle it.
The SIRIUS 3RN2 thermistor motor protection relays can be recycled thanks to a low
-
pollutant manufacturing process
. For environmentally-friendly recycling and disposal of your
electronic waste, please contact a company certified for the disposal of electronic waste.
WARNING
Protection against electrically conductive contamination
The devices must be protected against conductive contamination while taking account of
the ambient conditions. One way to achieve this is to install the devices in a control cabinet
with the appropriate degree of protection.
You will find more detailed information in IEC 60529, for example.
CAUTION
Protection against electrostatic charge
When handling and installing the SIRIUS 3RN2 thermistor motor protection relays, ensure
that the components are protected from being electrostatically charged. Changes to the
system configuration and wiring are only permissible while the supply voltage is switched
off.
Connection of SIRIUS 3RN2 thermistor motor protection relays is only permissible when
the power supply is switched off.

Safety notes
2.2 Intended use
SIRIUS 3RN2 thermistor motor protection relay
14 Manual, 10/2016, A5E34244868002A/RS-AA/001
2.2
Intended use
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Property Damage.
Intended Use of Hardware Products
This equipment is only allowed to be used for the applications described in the catalog and
in the technical description, and only in conjunction with non-Siemens equipment and
components recommended by Siemens.
Correct transport, storage, installation and assembly, as well as careful operation and
maintenance, are required to ensure that the product operates safely and without faults.
2.3
Current information about operational safety
Important note for maintaining operational safety of your system
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury or Risk of Property Damage
Please take note of our latest information
Systems with safety-related characteristics are subject to special operational safety
requirements on the part of the operator. The supplier is also obliged to comply with special
product monitoring measures. For this reason, we publish a special newsletter containing
information on product developments and features that are (or could be) relevant to
operation of safety-related systems. By subscribing to the appropriate newsletter, you will
ensure that you are always up-to-date and able to make changes to your system, when
necessary:
SIEMENS Newsletter (http://www.industry.siemens.com/newsletter) Subscribe to the
following newsletter under "Products & Solutions":
•Control Components and System Engineering News

SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 15
ATEX
3
3.1
Safety and commissioning instructions for hazardous areas
Information and standards
Increased danger in hazardous areas means it is necessary to observe the following notes
and standards carefully:
●EN 60079-14/VDE 0165-1 for electrical apparatus for explosive gas atmospheres
●EN 60079-17 Inspection and maintenance of electrical installations in hazardous areas.
●EN 50495 Safety devices required for the safe functioning of equipment with respect to
explosion risks
The following SIRIUS 3RN2 thermistor motor protection relays with short-circuit detection are
approved for Equipment Group II, Category (2) in Area "G" (areas in which potentially
explosive gas, vapor, mist, or air mixtures are present) and are additionally approved for
Area "D" (areas containing combustible dust):
●3RN2011
●3RN2012-.B.30
●3RN2013
●3RN2023
SIRIUS 3RN2 thermistor motor protection relays are not intended for installation in
hazardous areas. If they are installed in a potentially explosive atmosphere, the SIRIUS
3RN2 thermistor motor protection relays must be adapted to the applicable type of
protection.
The machine or plant must shut down immediately if the SIRIUS 3RN2 thermistor motor
protection relay is tripped, even if connected through a frequency converter. This must be
implemented with circuitry.
SIRIUS 3RN2 thermistor motor protection relays with functional safety in accordance with
EN 50495 are suitable for protecting explosion-proof motors/machines.
On devices with a supply voltage of 24 V AC/DC, you must ensure galvanic separation with
a battery network or a power supply unit with galvanic separation (e.g. isolating transformer)
(does not apply to 3RN2013-.BA30).

ATEX
3.1 Safety and commissioning instructions for hazardous areas
SIRIUS 3RN2 thermistor motor protection relay
16 Manual, 10/2016, A5E34244868002A/RS-AA/001
A SIRIUS 3RN2 thermistor motor protection relay set to "automatic RESET" mode will be
reset automatically after the recovery time has elapsed, without the RESET button being
pressed. An additional ON button has to be used to ensure that the motor does not start up
automatically following tripping. You must not use "Automatic RESET" mode in applications
where there is a risk of personal injury or damage to property if the motor restarts
unexpectedly.
A risk analysis must be performed for the complete plant or machine. If this analysis yields a
lower hazard potential (category 1), all SIRIUS 3RN2 thermistor motor protection relays can
be used, provided the safety regulations are observed.
WARNING
Personal injury and damage to property
All connection, commissioning and maintenance work must be performed by qualified,
responsible personnel. Improper handling may result in serious personal injury and
considerable damage to property.
Cable routing
The measuring circuit cables must be routed as separate control cables. Use of cores from
the power supply cable of the motor or any other main supply cables is not permitted. If
extreme inductive or capacitive interference is expected as a result of power lines routed in
parallel, shielded control cables must be used.
Maximum length of sensor circuit cables for devices without short-circuit detection in the
sensor circuit:
Conductor cross section
3RN2000, 3RN2010
2.5 mm
2
2 x 2800 m
1.5 mm
2
2 x 1500 m
0.5 mm
2
2 x 500 m
Maximum length of sensor circuit cables for devices with short-circuit detection 1):
Conductor cross section
3RN2011, 3RN2012, 3RN2013, 3RN2023
2.5 mm
2
2 x 250 m
1.5 mm
2
2 x 150 m
0.5 mm22 x 50 m
1) Short-circuits in the sensor circuit are detected up to this maximum cable length.

ATEX
3.1 Safety and commissioning instructions for hazardous areas
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 17
Safety data
Safety data calculated according to DIN EN ISO 13849 and IEC 61508 for an ambient temperature of
40 °C and self-heating of 15 °C
SIL
1
Performance level (according to DIN EN ISO
13849)
C
Category (according to DIN EN ISO 13849)
Cat. 1
Architecture 1oo1
HFT
0
Safety device type
Type B
λ
S
8.26E-07
λDD
6.80E-08
λ
DU
3.08E-07
SFF
≥60 %
PFD
≤1.5E-02
PFHd
≤1.5E-06
MTBF
≥50 years
MTTFd(according to EN ISO 13849)
High
DC
avg
(according to DIN EN ISO 13849)
None
T1 value (repeat test)
≤3 years (DIN EN 60079-17, Section 4.4)
Note
Currently valid safety values
You can find the currently valid safety values in the Siemens Industry Online Support
(
https://support.industry.siemens.com/cs/ww/en/ps/).
Installation and commissioning
SIRIUS 3RN2 thermistor motor protection relays are suitable for snap-on mounting onto a 35
mm standard rail in accordance with EN 60715 or for screw mounting with an adapter
(accessory).
Any mounting position is possible.
NOTICE
Test the protection function
Test the protection function before commissioning.

ATEX
3.1 Safety and commissioning instructions for hazardous areas
SIRIUS 3RN2 thermistor motor protection relay
18 Manual, 10/2016, A5E34244868002A/RS-AA/001
Notes on configuration
Install the measuring circuit cables as separate control cables. Use of cores from the power
supply cable of the motor or any other main supply cables is not permitted. If extreme
inductive or capacitive interference is expected as a result of power lines routed in parallel,
use shielded control cables.
NOTICE
Use in hazardous areas
When used in a hazardous area, the thermistor motor protection relays must not be
operated with automatic RESET (terminals Y1 and Y2 permanently jumpered).
User test (repeat test)
Repeat testing in accordance with EN 60079-17 can be combined with the user test.
Operation of the SIRIUS 3RN2 thermistor motor protection relay must be discontinued if test
results are negative.
The test must be performed by a qualified person familiar with the specified standards.
The test function can be activated and a trip simulated by pressing the blue TEST/RESET
button for > 2 s. Correct function is only ensured if the unit is tripped.
Maintenance and repair
These devices are maintenance-free.
Only the manufacturer may perform repairs on the SIRIUS 3RN2 thermistor motor protection
relay.

ATEX
3.2 Use in areas subject to an explosion hazard due to gases or dust
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 19
3.2
Use in areas subject to an explosion hazard due to gases or dust
SIRIUS components meet a wide range of requirements for operation in hazardous areas
and for switching and protecting components used in hazardous areas.
Types of protection in accordance with ATEX Directive 2014/34/EU
3RN2 thermistor motor protection relays are suitable for overload protection of explosion-
proof motors with protection type Ex e. The relays meet the requirements of EN 60079. They
are approved under Device Group II, Category (2) for motors operated in Area "G" (areas in
which potentially explosive gas, vapor, mist, and air mixtures are present) and additionally in
Area "D" (areas containing combustible dust).
The 3RN2 thermistor motor protection relays are not intended for installation in hazardous
areas. If they are installed in a hazardous area, the 3RN2 thermistor motor protection relays
must be adapted to the applicable type of protection.
For 3RN2 thermistor motor protection relays, the EC type examination certificate is available
for Group II, Category (2) G [Ex e] [Ex d] [Ex px] and D [Ex t] [Ex p]. The number is: PTB 15
ATEX 3011
Further information and certificates are available for download on the Internet
(http://www.siemens.com/automation/service&support).
You will find further information on explosion protection (ATEX) on the Internet
(http://www.siemens.com/sirius/atex).
All ATEX-certified 3RN2 thermistor motor protection relays meet the requirements of
Category 2 (EN ISO 13849-1):
●3RN2011
●3RN2012-..30
●3RN20.3

ATEX
3.2 Use in areas subject to an explosion hazard due to gases or dust
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20 Manual, 10/2016, A5E34244868002A/RS-AA/001