SIRIUS 3SK safety relays

Further information
Home page, see http://www.siemens.com/safety-relays
Industry Mall, see http://www.siemens.com/product?3SK
Conversion tool e.g. from 3TK28 to 3SK, see http://www.siemens.com/sirius/conversion-tool

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 relay
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 (IEC 61508/IEC 62061) or PL e (EN ISO 13849-1).

Device series

SIRIUS 3SK safety relays stand out on account of their flexibility in both parameterization and system configurations with several evaluation units. Optimized solutions when selecting components are facilitated by a clearly structured component range:

3SK1 Standard basic units
3SK1 Advanced basic units
3SK2 basic units
3SK output expansions
3SK1 input expansions
Accessories

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 additionally offer:

Universal application opportunities thanks to multifunctionality
Time-delayed outputs
Expansion of inputs and outputs

3SK2 basic units

In addition, 3SK2 basic units offer:

Up to six fail-safe, independent shutdown functions
Flexible application thanks to software parameterization
Powerful semiconductor outputs
Convenient diagnostics using diagnostics display and configuration software

In the case of 3SK1 Advanced basic units or 3SK2 basic units, the 3ZY12 device connector allows safety functions involving several sensors and actuators to be set up very quickly.

System configuration example

The 3SK1 and 3SK2 Standard and Advanced 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 exceptions to this are 3TK2810 devices.

Overview of functions of the 3SK series

Type	3SK1 Standard basic units		3SK1 Advanced basic units		3SK2 basic units
	3SK1 Standard basic units		3SK1 Advanced 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
Mechanical	✓	✓	✓	✓	✓	✓
Single-ended	✓¹⁾	✓	✓	✓	✓	✓
Antivalent	--	--	✓	✓	✓	✓
Expandable	--	✓ by means of cascading	✓	✓	--	--
Inputs
Freely parameterizable	--	--	--	--	10 single-channel, 5 two-channel	20 single-channel, 10 two-channel
Parameter
Start (auto/monitored)	✓	✓	✓	✓	A large number of functions can be adjusted via software parameterization for each input/output.
Sensor connection, 2 x 1-channel/ 1 x 2-channel	✓ Using wiring	✓	✓	✓
Cross-circuit monitoring	✓ Using wiring	✓	✓	✓
Start test ON/OFF	--	✓	✓	✓
Monitoring of two-hand operator panels acc. to EN 574	--	--	✓	✓
Safety shutdown/pressure-sensitive mat	--	--	✓	✓
Safe outputs
Instantaneous	✓	✓	✓	✓	Parameterizable	Parameterizable
Time-delayed	--	--	✓	✓	Parameterizable	Parameterizable
Can be expanded using safe relay outputs	✓ Using wiring	✓ Using wiring	✓	✓	✓	✓
independent	--	--	--	--	✓⁴⁾	✓⁵⁾
Device connectors	--	--	✓	✓	✓	✓
Options
External memory module	--	--	--	--	--	✓
Display on device	--	--	--	--	--	✓
External diagnostic module can be connected	--	--	--	--	✓	✓
Control supply voltage
24 V DC	✓²⁾	✓	✓	✓	✓	✓
110 … 240 AC/DC	✓	✓⁶⁾	✓³⁾	✓³⁾	--	--

✓ Available

-- Not available

¹⁾ 24 V basic units only.

²⁾ 24 V AC/DC.

³⁾ Possible using 3SK1230 power supply via device connector.

⁴⁾ Up to 4 independent safe outputs, two of which via device connector.

⁵⁾ Up to 6 independent safe outputs, two of which via device connector.

⁶⁾ Possible using 3SK1230 power supply by means of wiring.

Parameter assignment

3SK112 and 3SK1112 with DIP switches

The 3SK112 and 3SK1112 safety relays are configurable safety relays. They are used as evaluation units for typical safety chains (detect, evaluate, respond). A number of functions can be set using the DIP switches on the front. Thus the 3SK112 and 3SK1112 can be used universally.

DIP switch No.	OFF	ON
1	Autostart sensor input	Monitored start sensor input
2	Without cross-circuit monitoring	With cross-circuit monitoring
3	2 x 1-channel sensor connection	1 x 2-channel sensor connection
4	With start test	Without start test

3SK2 with software

3SK2 safety relays are configured using the SIRIUS Safety ES software. This means that the response of a 3SK2 unit, as well as the function of the individual safe outputs, can be parameterized easily and conveniently in the logic diagram. In addition, the configuration can be printed out for documentation purposes. The software also supports the user during commissioning and troubleshooting by means of online diagnostics and the option of being able to “force" signals in the logic plan. Through this, 3SK2 safety relays are able to offer maximum flexibility and universal application options.

Note:

For more information on SIRIUS Safety ES, see “Parameterization, Configuration and Visualization".

Enclosure concept

Innovative enclosure concept for SIRIUS 3SK safety relays

Connection method

The 3SK safety relays are available with screw or spring-type terminals (push-in).

Spring-type terminals (push-in)

Push-in connections are a form of spring-type terminals allowing fast wiring without tools for rigid conductors or conductors equipped with end sleeves. As with other spring-type terminals, a screwdriver (with 3.0 x 0.5 mm blade) is required to disconnect the conductor. The same tool can also be used to wire finely-stranded or stranded conductors with no end finishing. The advantages of the push-in terminals are found, as with all spring-type terminals, in speed of assembly and disassembly and vibration-proof connection. There is no need for the checking and tightening required with screw terminals.

Can be expanded by adding the 3RM1 motor starter

With previous safety relay and motor feeder configurations, a huge amount of wiring was required to monitor motor feeders in safety applications.

With the integration of the SIRIUS 3RM1 motor starter into the SIRIUS 3SK safety relay system family, this wiring has been minimized for the first time. Motor starters up to 3 kW can easily be integrated into the safety relay system using SIRIUS 3ZY12 device connectors, without additional wiring between the evaluation unit and the motor starter.

Conventional system configuration

System design using 3SK1 and 3RM1

Article No. scheme

Product versions		Article number
3SK1 safety relays		3SK1	❒	❒	❒	–	❒	❒	❒	❒	❒
Device version	Basic unit		1
Device version	Expansion unit		2
Device version, e.g.	3SK11: Standard; 3SK12: Output expansion			1
Device version, e.g.	3SK11: Advanced; 3SK12; input expansion			2
Type of outputs	Relay outputs				1
	Semiconductor outputs				2
	Power outputs				3
Connection type	Screw terminals						1
Connection type	Spring-type terminals (push-in)						2
Control circuits/actuation, e.g.	3SK11: 3 enabling circuits							A
	3SK11: 2 enabling circuits							B
	3SK11: 4 enabling circuits							C
Type of control supply voltage, e.g.	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 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
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 variants	10 F-DI, 2 F-DQ, width 22.5 mm			1
Device variants	10 F-DI, 4 F-DQ, width 45 mm			2
Connection type	Screw terminals						1
Connection type	Spring-type terminals (push-in)						2
Example		3SK2	1	1	2	–	1	A	A	1	0

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.

Область применения

3SK1 safety relays

SIRIUS 3SK1 safety relays are used mainly in autonomous safety applications which are not connected to a safety-oriented bus system. Their function here is to evaluate the sensors and the safety-oriented shutdown of hazards. Also they check and monitor the sensors, actuators and safety-oriented functions of the safety relay.

3SK2 safety relays

SIRIUS 3SK2 safety relays are used mainly in autonomous and more complex safety applications, in which the functional scope of the 3SK1 devices is no longer adequate, e.g. when implementing independent trip functions. Their function here is to evaluate the sensors and the safety-related shutdown of hazards. They also check and monitor the sensors, actuators and safety-oriented functions of the safety relay.

Особенности

General

Approved for all safety applications because of its compliance with the highest safety requirements (SIL 3 and PL e)
Universally usable thanks to adjustable parameters
Usable worldwide thanks to globally valid certificates
Compact SIRIUS design
Device connectors with standard 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 length up to 2 000 m allows it to be used in plants covering large areas

Relay outputs

Different voltages can be switched through the floating contacts
Currents up to 5 A can be switched with relay contacts (AC-15/DC-13)

Semiconductor outputs

Wear-free
Suitable for operation in fast switching applications
Insensitive to vibrations and dirt
Good 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 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 routed 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

Note:

For SIRIUS 3RM1 motor starters, see "Load Feeders and Motor Starters for Use in Switchgear Cabinets" → "SIRIUS 3RM1 Motor Starters".

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 spare parts storage and simplify the considerations during configuration with regard to the evaluation units to be selected.

Технические данные

Order number		3SK1111-.AB30 3SK1211-.BB00 3SK1211-.BB40	3SK1111-.AW20 3SK1121 3SK1211-.BW20	3SK1112	3SK1120	3SK1122	3SK1213	3SK1220
Width x Height x Depth		22.5 × 100 × 121.6		22.5 × 100 × 91.6	17.5 × 100 × 121.6	22.5 × 100 × 121.6	90 × 100 × 121.6	17.5 × 100 × 121.6
General technical data:
Ambient temperature
● during operation	°C	-25 ... +60
● during storage	°C	-40 ... +80
Installation altitude at height above sea level maximum	m	2 000
Air pressure acc. to SN 31205	hPa	900 ... 1 060
Shock resistance		10g / 11 ms					5 g / 10 ms	10g / 11 ms
Vibration resistance acc. to IEC 60068-2-6		5 ... 500 Hz: 0,75 mm
Protection class IP of the enclosure		IP20
Protection against electrical shock		finger-safe
Insulation voltage rated value	V	300		50			300	50
Surge voltage resistance rated value	V	4 000		500			4 000	800
Safety Integrity Level (SIL) acc. to IEC 61508		SIL3
Performance level (PL) acc. to EN ISO 13849-1		e
T1 value for proof test interval or service life acc. to IEC 61508	y	20
EMC emitted interference		IEC 60947-5-1, IEC 61000	IEC 60947-5-1, Class A				IEC 60947-5-1, IEC 61000	IEC 60947-5-1, Class A
Certificate of suitability
● UL approval		Yes
● TÜV (German technical inspectorate) certificate		Yes

Order number		3SK1111 3SK1121-.AB40 3SK1211	3SK1112 3SK1122	3SK1120	3SK1121.CB4.	3SK1213
Switching capacity current of the NO contacts of the relay outputs
● at AC-15 at 230 V	A	5	--		3	10
● at DC-13 at 24 V	A	5	--		3	6
Switching capacity current of semiconductor outputs at DC-13 at 24 V	A	--	2	0.5	--	--

Order number			3SK1.11-....0	3SK1111-.AW20	3SK1...-..B40	3SK112.-.AB40	3SK1121-.AB40	3SK1121-.CB4.	3SK1122-.CB4.	3SK1213-.A..0
PFHD with high demand rate acc. to EN 62061		1/h	0.0000000017	0.0000000015	0.000000001	0.0000000013	0.0000000025	0.0000000037	0.0000000015	0.000000001
PFDavg with low demand rate acc. to IEC 61508			0.000001		0.000007					0.000001

Order number		3SK2112-.AA10	3SK2122-.AA10
Width x Height x Depth		22.5 × 100 × 124.5	45 × 100 × 124.5
General technical data:
Ambient temperature
● during operation	°C	-25 ... +60
● during storage	°C	-40 ... +80
Installation altitude at height above sea level maximum	m	2 000
Air pressure acc. to SN 31205	kPa	90 ... 106
Shock resistance		15g / 11 ms
Vibration resistance acc. to IEC 60068-2-6		5 ... 500 Hz: 0,75 mm
Protection class IP of the enclosure		IP20
Protection against electrical shock		finger-safe
Insulation voltage rated value	V	50
Surge voltage resistance rated value	V	800
Safety Integrity Level (SIL) acc. to IEC 61508		SIL3
Performance level (PL) acc. to EN ISO 13849-1		e
T1 value for proof test interval or service life acc. to IEC 61508	y	20
EMC emitted interference acc. to IEC 60947-1		class A
Certificate of suitability
● UL approval		Yes
● TÜV (German technical inspectorate) certificate		Yes
Switching capacity current of semiconductor outputs at DC-13 at 24 V	A	4
PFHD with high demand rate acc. to EN 62061	1/h	0.00000001	0.000000012
PFDavg with low demand rate acc. to IEC 61508		0.000015	0.000018

SIRIUS 3SK safety relays

Информационные материалы

Device series

Overview of functions of the 3SK series

Parameter assignment

Enclosure concept

Connection method

Can be expanded by adding the 3RM1 motor starter

Article No. scheme

Область применения

3SK1 safety relays

3SK2 safety relays

Особенности

General

Relay outputs

Semiconductor outputs

Power outputs (3SK1213 output expansion)

Can be expanded by adding the 3RM1 motor starter

3ZY12 device connectors

Configuration and stock keeping

Технические данные