ENG_287026.XML
P_IC01_XX_00264
SIRIUS 3SK safety relays
G_IC01_XX_00896
Video: 3SK safety relays - Select the optimum device precisely for your application
Note:
For more videos in the SiemensKnowledgeHub – YouTube, see www.youtube.com/@SiemensKnowledgeHub.
SIRIUS 3SK safety relays are the key elements of a consistent, cost-effective safety chain. Whether you need EMERGENCY STOP functionality, protective door monitoring, light arrays, laser scanners or the protection of presses or punches – slimline SIRIUS safety relays enable all safety applications to be implemented in the best possible way in terms of engineering and price.
The following safety-related functions are available:
- Monitoring the safety functions of sensors
- Monitoring the sensor leads
- Monitoring the correct device function of the safety relays
- Monitoring the actuators in the shutdown circuit
- Safety-related disconnection when dangers arise
SIRIUS 3SK safety relays are approved for applications up to SIL 3 according to IEC 62061 or PL e according to ISO 13849-1.
A version with protective coating on the printed circuit board according to IPC-A-610 is available for use in harsh ambient conditions (other device versions are available on request).
Device series
G_IC01_XX_00677
SIRIUS 3SK device series
SIRIUS 3SK safety relays stand out due to their flexibility for both parameterization and system designs with several evaluation units. This reduces device variance, thus bringing advantages in terms of device selection and spare parts management. Optimized solutions when selecting components and reduced spare part inventory requirements are facilitated by a clearly structured component range. Device connectors are simply used for connecting most components. This considerably reduces the wiring effort and avoids possible errors.
3SK1 Standard basic units
The 3SK1 Standard basic units are characterized by the following features:
- Compact design
- Simple operation
- Relay and semiconductor outputs
- Economical solution
3SK1 Advanced basic units
The 3SK1 Advanced basic units also offer:
- Universal application possibilities thanks to multifunctionality
- Time-delayed outputs
- Expansion of inputs and outputs
3SK2 basic units
The 3SK2 basic units also offer:
- Up to six fail-safe, independent shutdown functions
- Flexible in use thanks to software parameterization
- Powerful semiconductor outputs
- Convenient diagnostics using diagnostics display and configuration software
- Communication via PROFINET by means of a communications module
All three basic device series can be supplemented with output expansions. These provide further fail-safe, potential-free relay contacts for controlling actuators. In addition, the 3RM1 Failsafe fail-safe motor starters can also be integrated into the 3SK system (see SIRIUS 3RM1 motor starters).
In the 3SK1 Advanced and 3SK2 device series, the output expansions are connected by means of device connectors, in the 3SK1 Standard series by means of wiring.
For the 3SK1 Advanced device series, there is also the possibility of supplementing the basic units with input expansions. Here too, the connection is made via device connectors. This means that no individual basic units need to be interconnected if more than one sensor is required in the safety application.
Since the 3SK1 Advanced device series comprises devices with 24 V DC operational voltage, a power supply is also available.
The 3SK2 device series can optionally be connected with a communications module via PROFINET to a control system, e.g. for diagnostics.
It is also possible to connect a diagnostics module to the 3SK2 system. This can be mounted in the control cabinet door, for example, and displays errors and diagnostics as well as configuration data quickly and clearly.
The 3SK1 Standard and Advanced and 3SK2 series are a high-quality replacement for the 3TK28 safety relays. In their narrower design, and equipped with greater functionality, they can replace every 3TK28 device. The only exception to this are the 3TK2810 devices.
The 3RQ1 force-guided coupling relays can be used as an output expansion for 3SK up to SIL 3/PL e. Connection is also possible with device connectors.
G_IC01_XX_00676
System overview
Overview of functions of the 3SK series
Type
|
3SK1 Standard basic units
|
3SK1 Advanced basic units
|
3SK2 basic units
|
22.5 mm
|
45 mm
|
Safe relay outputs
|
Safe semiconductor outputs
|
Safe relay outputs
|
Safe semiconductor outputs
|
Safe semiconductor outputs
|
Safe semiconductor outputs
|
Sensors
|
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
✓1)
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
--
|
--
|
✓
|
✓
|
✓
|
✓
|
|
--
|
✓ by means of cascading
|
✓
|
✓
|
--
|
--
|
Inputs
|
|
2 x 1-channel, 1 x 2-channel
|
2 x 1-channel, 1 x 2-channel
|
2 x 1-channel, 1 x 2-channel
|
2 x 1-channel, 1 x 2-channel
|
Freely configurable:
10 x 1-channel, 5 x 2-channel
|
Freely configurable:
20 x 1-channel, 10 x 2-channel
|
Parameters
|
|
✓
|
✓
|
✓
|
✓
|
A variety of functions can be set for each input/output by means of software parameterization.
|
- Sensor connection 2 x single-channel/
1 x two-channel
|
✓ by means of wiring
|
✓
|
✓
|
✓
|
|
✓ by means of wiring
|
✓
|
✓
|
✓
|
|
--
|
✓
|
✓
|
✓
|
- Monitoring of two-hand operation consoles according to EN 574/ISO 13851
|
--
|
--
|
✓
|
✓
|
|
--
|
--
|
✓
|
✓
|
Safe outputs
|
|
✓
|
✓
|
✓
|
✓
|
Configurable
|
Configurable
|
|
--
|
--
|
✓
|
✓
|
Configurable
|
Configurable
|
- Expandable with safe relay outputs
|
✓ by means of wiring
|
✓ by means of wiring
|
✓
|
✓
|
✓
|
✓
|
|
--
|
--
|
--
|
--
|
✓2)
|
✓3)
|
|
--
|
--
|
✓
|
✓
|
✓
|
✓
|
Options
|
|
--
|
--
|
--
|
--
|
--
|
✓
|
|
--
|
--
|
--
|
--
|
--
|
✓
|
- External diagnostics module can be connected
|
--
|
--
|
--
|
--
|
✓
|
✓
|
Control supply voltage
|
|
✓4)
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
✓
|
✓5)
|
✓6)
|
✓6)
|
--
|
--
|
✓ Available
-- Not available
1) 24 V basic units only.
2) Up to four independent safe outputs, two of which via device connector.
3) Up to six independent safe outputs, two of which via device connector.
4) 24 V AC/DC.
5) Possible using 3SK1230 power supply by means of wiring.
6) Possible using 3SK1230 power supply via device connector.
Enclosure concept
G_IC01_XX_00431
Innovative enclosure concept for SIRIUS 3SK safety relays
Parameter assignment
3SK112 and 3SK1112 with DIP switch
The 3SK112 and 3SK1112 safety relays are configurable safety relays. They are used as evaluation units for typical safety chains (detect, evaluate, react). A number of functions can be set using the DIP switches on the front. 3SK112 and 3SK1112 are therefore universally applicable.
DIP switch No.
|
OFF
|
ON
|
Schematic
|
1
|
Sensor input Autostart
|
Sensor input Monitored start
|
G_IC01_XX_00196 |
2
|
Without cross-circuit detection
|
With cross-circuit detection
|
3
|
2 x 1-channel sensor connection
|
1 x 2-channel sensor connection
|
4
|
With start-up testing
|
Without start-up testing
|
3SK2 with software
The SIRIUS Safety ES (TIA Portal) software permits quick and easy parameterization, commissioning and diagnostics of SIRIUS 3SK2 safety relays. Device configuration and device functionality can easily be created graphically directly on the PC and transferred to the switching device through a USB cable or an optional PROFINET interface.
Note:
For more information on SIRIUS Safety ES (TIA Portal), see Parameterization, configuration and visualization.
Communications
✓ Available
Optimum connection with device connectors
G_IC01_XX_00692
3RQ1 with 3SK1
In the case of 3SK1 Advanced basic units or 3SK2 basic units, the 3ZY12 device connectors allow safety functions involving several sensors and actuators to be constructed very quickly.
3RQ1 coupling relays as output expansion for 3SK
The force-guided SIRIUS 3RQ1 coupling relays in a modern titanium gray industrial enclosure are available in widths of 17.5 mm and 22.5 mm and can be used as an output expansion for SIRIUS 3SK safety relays.
They have safety certification up to SIL 3 according to IEC 62061/IEC 61508 or PL e according to ISO 13849-1.
Versions with a wide range voltage input of 24 to 240 V AC/DC and an installation depth of 90 mm, and versions with 24 V DC and an installation depth of 120 mm for use with 3SK device connectors are available.
The series consists of devices with up to five outputs and can be supplied with screw or spring-loaded terminals (push-in).
Note:
SIRIUS 3RQ1 coupling relays, see SIRIUS 3RQ1 coupling relays.
Seamlessly integrated safety right through to the main circuit
G_IC01_XX_00533
Problem-free integration of functional safety into the main circuit through the simple combination of 3RM1 and 3SK1 devices
Functional safety in the main circuit needs to be both simple and flexible
The unique compatibility of hybrid 3RM1 fail-safe motor starters and 3SK safety relays means that integrated functional safety right through to the main circuit is no longer a problem.
Their compact design allows the motor starters to be installed to the right of the safety relay in a simple manner, just like an output expansion. The wiring of the safety-related signals to the relay can be performed simply, quickly and in an error-free manner using the device connector.
The ergonomically designed enclosure with removable terminals and terminal labeling in the hinged cover allows for the cables to be conveniently diagonally mounted from the front. Either screw or spring-loaded terminals with push-in technology are available.
Highlights
- Fail-safe disconnection of motors up to 3 kW
- Problem-free combination of fail-safe motor starters and safety relays
- End-to-end system, simple setup using device connectors
- Ergonomic enclosure
Note:
SIRIUS 3RM1 motor starters, see SIRIUS 3RM1 motor starters.
Ordering notes for multi-unit packaging
SIRIUS 3SK safety relays can also be ordered in practical and environmentally friendly multi-unit packaging on request.
Multi-unit packaging with order code X90
When ordering products in multi-unit packaging, "-Z" must be added to the article number of the product concerned and the order code "X90" must be specified in addition.
Ordering example:
3SK1111-2AB30-Z X90;
Order quantity 12 items → Packed number of items 12
For more information see appendix of Catalog IC 10.
Article number schemes
Product versions
|
Article number
|
|
|
|
|
|
|
3SK1 safety relays
|
3SK1
|
❒
|
❒
|
❒
|
–
|
❒
|
❒
|
❒
|
❒
|
❒
|
|
❒
|
❒
|
❒
|
❒
|
|
Device version
|
Basic unit
|
|
1
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Expansion unit
|
|
2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Device versions
|
3SK11: Standard; 3SK12: Output expansion
|
|
|
1
|
|
|
|
|
|
|
|
|
|
|
|
|
|
3SK11: Advanced; 3SK12: Input expansion
|
|
|
2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Type of outputs
|
Relay outputs
|
|
|
|
1
|
|
|
|
|
|
|
|
|
|
|
|
|
Semiconductor outputs
|
|
|
|
2
|
|
|
|
|
|
|
|
|
|
|
|
|
Power outputs
|
|
|
|
3
|
|
|
|
|
|
|
|
|
|
|
|
|
Connection type
|
Screw terminals
|
|
|
|
|
|
1
|
|
|
|
|
|
|
|
|
|
|
Spring-loaded terminals (push-in)
|
|
|
|
|
|
2
|
|
|
|
|
|
|
|
|
|
|
Control circuit/actuation
|
3SK11: 3 enabling circuits
|
|
|
|
|
|
|
A
|
|
|
|
|
|
|
|
|
|
3SK11: 2 enabling circuits
|
|
|
|
|
|
|
B
|
|
|
|
|
|
|
|
|
|
3SK11: 4 enabling circuits
|
|
|
|
|
|
|
C
|
|
|
|
|
|
|
|
|
|
Type of control supply voltage
|
3SK1213: 24 V AC, 50/60 Hz
|
|
|
|
|
|
|
|
B
|
0
|
|
|
|
|
|
|
|
3SK1: 24 V AC/DC, 50/60 Hz
|
|
|
|
|
|
|
|
B
|
3
|
|
|
|
|
|
|
|
3SK1: 24 V DC
|
|
|
|
|
|
|
|
B
|
4
|
|
|
|
|
|
|
|
3SK1213: 115 V AC, 50/60 Hz
|
|
|
|
|
|
|
|
J
|
2
|
|
|
|
|
|
|
|
3SK1213: 230 V AC, 50/60 Hz
|
|
|
|
|
|
|
|
L
|
2
|
|
|
|
|
|
|
|
3SK1: 110 ... 240 V AC/DC; 50/60 Hz
|
|
|
|
|
|
|
|
W
|
2
|
|
|
|
|
|
|
|
Time delay
|
None
|
|
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
0.05 ... 3 s
|
|
|
|
|
|
|
|
|
|
1
|
|
|
|
|
|
|
0.5 ... 30 s
|
|
|
|
|
|
|
|
|
|
2
|
|
|
|
|
|
|
5 ... 300 s
|
|
|
|
|
|
|
|
|
|
4
|
|
|
|
|
|
|
Versions
|
With protective coating on printed circuit board
|
|
|
|
|
|
|
|
|
|
|
0
|
A
|
X
|
0
|
|
|
Example
|
|
3SK1
|
1
|
1
|
1
|
–
|
1
|
A
|
B
|
3
|
0
|
|
|
|
|
|
|
Product versions
|
Article number
|
3SK2 safety relays
|
3SK2
|
1
|
❒
|
2
|
–
|
❒
|
A
|
A
|
1
|
0
|
Device versions
|
10 F-DI, 2 F-DQ, width 22.5 mm
|
|
|
1
|
|
|
|
|
|
|
|
20 F-DI, 4 F-DQ, width 45 mm
|
|
|
2
|
|
|
|
|
|
|
|
Connection type
|
Screw terminals
|
|
|
|
|
|
1
|
|
|
|
|
Spring-loaded terminals (push-in)
|
|
|
|
|
|
2
|
|
|
|
|
Example
|
3SK2
|
1
|
1
|
2
|
–
|
1
|
A
|
A
|
1
|
0
|
Product versions
|
Article number
|
3SK2 interface modules
|
3SK2
|
5
|
1
|
1
|
–
|
❒
|
F
|
A
|
1
|
0
|
Connection type
|
Screw terminals
|
|
|
|
|
|
1
|
|
|
|
|
Spring-loaded terminals (push-in)
|
|
|
|
|
|
2
|
|
|
|
|
Example
|
3SK2
|
5
|
1
|
1
|
–
|
1
|
F
|
A
|
1
|
0
|
Note:
The article number schemes show 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.
ENG_287027.XML
General
- Approved for all safety applications because of its compliance with the highest safety requirements (SIL 3/PL e)
- Universally usable thanks to adjustable parameters
- Usable worldwide thanks to globally valid certificates
- Compact SIRIUS design
- Device connectors with DIN-rail mounting for flexible connectability and expandability
- Removable terminals for greater plant availability
- Yellow terminal covers clearly identify the device as a safety component
- Sensor cable with a length of up to 2 000 m allows it to be used in extensive plants
- Suitable for installation altitudes up to 4 000 m
- Device versions with protective coating on printed circuit board
Relay outputs
- Different voltages can be switched through the floating contacts
- The relay contacts allow currents of up to 5 A at AC-15/DC-13 to be connected
Semiconductor outputs
- Wear-free
- Suitable for operation in frequently switching applications
- Insensitive to vibrations and dirt
- High electrical endurance
Power outputs (3SK1213 output expansion)
- Different voltages can be switched through the floating contacts
- With the power relay contacts currents up to 10 A AC-15/6 A DC-13 can be switched
- High mechanical and electrical endurance
- Protective separation between safe outputs and electronics
Can be expanded by adding the 3RM1 motor starter
SIRIUS 3SK safety relays are ideal for combining with the SIRIUS 3RM1 motor starters.
Combinations are made by means of SIRIUS 3ZY12 device connectors (in combination with 3SK1 Advanced/3SK2) or conventional wiring (for all 3SK1 and 3SK2 basic units).
This makes collective shutdown very easy in assemblies. The wiring, and ultimately the shutting down of the control supply voltage for the expansion components in EMERGENCY STOP situations, is performed via the device connector. There is no further need for complex looping of the connecting cables between the safety relay and the motor starters.
The 3RM1 motor starter combines the benefits of semiconductor technology and relay technology. This combination is also known as hybrid technology.
The hybrid technology in the motor starter is characterized by the following features:
- The inrush current in the case of motorized loads is conducted briefly via the semiconductors. Advantages include protection of the relay contacts and a long service life due to low wear.
- The uninterrupted current is conducted via relay contacts. Advantages include lower heat losses compared with the semiconductor.
- Shutdown is implemented again via the semiconductor. The contacts are only slightly exposed to arcs, and this results in a longer service life.
- Integrated overload protection
Expansion option with 3RQ1 coupling relay
SIRIUS 3SK safety relays are ideal for combining with the SIRIUS 3RQ1 coupling relays. Combinations are made by means of SIRIUS 3ZY12 device connectors or wiring.
3ZY12 device connectors
Using 3ZY12 device connectors to combine devices reduces the time required to configure and wire the components. At the same time errors are avoided during wiring, and this considerably reduces the testing required for the fully-assembled application.
Configuration and stock-keeping
Variable setting options by means of DIP switches or software, a wide voltage range (3SK1111) and a special power supply unit (3SK1 only) reduce the cost of keeping stocks, along with the configuration considerations of which evaluation unit should be selected.
Communications
The 3SK2 safety relays can be easily integrated in the overall application via PROFINET using optionally available interface modules.
This provides the following advantages:
- Exchange of signals and information with the plant controller
- Read-out and visualization of diagnostics information of the safety relay via the controller supports troubleshooting and reduces plant downtimes
- Access with the Safety ES engineering software via the fieldbus for parameterization, commissioning and diagnostics
Simulation
The SIRIUS Sim simulation tool for 3SK2 can be used to quickly and easily test configurations that have been created without real devices. The configurations thus created can then be loaded directly into the real devices. Time and costs for engineering are thus reduced.