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Controls Division
Siemens Safety RelaysSafety Integrated
Safety Relays
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
Controls Division
SIRIUS Safety Relays
Product Range
Safety Integrated
Safety Relays
SIRIUS 3TK28 Safety Relays and Contactor Combinations
3TK282 / 3 Safety Relays
3TK2821-28 basic devices
3TK2830 expansion devices
Product Spectrum
3TK2834-35 press control devices
3TK2840
3TK284 Safety Relays and 3TK285 Contactor Combinations
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK284 without auxiliary contactors
3TK2840 basic device
3TK2841- 42 standard devices
3TK285 with auxiliary contactors
3TK2850
Wiring Diagrams
3RA7
Literature
3TK2850-53 basic device
3TK2856-57 expansion devices
3TK284 Safety Relay
3TK2845 multifunction device
Updates
3RA71 Safe Load Feeders
Controls Division
SIRIUS Safety Relays
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Safety Relays
Wiring Diagrams
3TK2845

Safety Relay &
Contactor
Combinations
Safety Load Feeders
Four complete product lines ( 0.5 amp to 40 amp)
 Safety Relays (electronic) switching up to 2 AMP (3TK284_.)
Wiring Diagrams
 Safety Relays switching up to 6 AMP (3TK282_.)
3TK2850
 Safety Contactor Combinations up to 10 AMP (3TK285_.)
Wiring Diagrams
 Safe Load Feeders up to 40AMP (3RA7_)
3RA7

Up to Cat. 4 acc. EN60954-1
Literature

Applicable for all SIGUARD Electro-mechanical products*
Updates
* Safety Magnet Switches and Optical Safety devices are applicable to
the new 3TK2840, 3TK2850 and 3RA7 Safe Load Feeders
Controls Division
SIRIUS Safety Relays
Approvals
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
Version
Optical Safety
Controls Division
SIRIUS Safety Relays
Electronic Safety Relays / Contactors / Load Feeders
Safety Integrated
Safety Relays
The future of safety relays and combinations,
„... one can safely say wear-free“
Product Spectrum
3TK2840
Safety relay with positively-driven contacts
Wiring Diagrams
3TK2845
Wiring Diagrams
2 processors
redundant + diversity
3TK2850
Output driver
Wiring Diagrams
3RA7
Literature
Updates
3TK2840, 3TK2850 and 3RA7 series
the innovative, cost-effective solution
Controls Division
SIRIUS Safety Relays
3TK2840 Series for DC Circuits
Safety Integrated
Safety Relays
Features and Benefits:
Product Spectrum
 22.5mm width unit
3TK2840
 Single or double channel
Wiring Diagrams
 Auto or manual restart configurable
3TK2845
 Up to Cat. 4 acc. to EN954
Wiring Diagrams
 2 redundent processors monitor each
other dynamically
3TK2850
 Excellent electrical endurance
Wiring Diagrams
 Make and break capacity at 2.0 Amp at
24VDC
3RA7
Literature
Updates
3TK284.
 Continuous cyclical self test
 Option of cascading
 Lowest price series
 Ideal for sensor inputs and all 24VDC
safety circuits
Controls Division
SIRIUS Safety Relays
3TK2840 Series for DC Circuits
Safety Integrated
Safety Relays
Additional features:
• Can be universally used for EMERGENCY OFF
and protective door monitoring
Product Spectrum
3TK2840
• Stop Categories 0 or 1
Wiring Diagrams
3TK2845
• Light curtains and light grids, safety mats
and safety switches (enable switches)
Wiring Diagrams
• Screw or cage-clamp connections
• Extremely compact design - SIRIUS Design
3TK2850
• Environmentally-friendly materials
Wiring Diagrams
• Certified for the global market
3RA7
Literature
Updates
3TK284.
Controls Division
SIRIUS Safety Relays
3TK284 Electronic Safety Relays
Safety Integrated
Safety Relays
Reduction of variants by
means of input circuits
Product Spectrum
The SIGUARD Safety Relays
3TK284.-...
Light Curtain
3TK2840
Wiring Diagrams
3TK2845
1-channel,
Autostart,
with electronic
sensors
Wiring Diagrams
3TK2850
RF=Feedback circuit
Literature
Updates
Advantages:
 All of the basic functions in
a single device
 1-2 channel sensor control
 Autostart, monitored start
Wiring Diagrams
3RA7
Have a standard 24V input
circuit with all of the required
functions which makes it
possible to have only one
device versions.
2-channel,
Autostart,
with electronic
sensors
 Cascading is possible
 Terminal labelling in
accordance with EN 50042
 Controlling via electronic
sensors
Controls Division
SIRIUS Safety Relays
The Basic 3TK2841-... Electronic device
Safety Integrated
Safety Relays
The required degree of safety in the output circuit is achieved using positivelydriven contacts of the external actuators (K1+K2) in the feedback circuit.
24V DC
Product Spectrum
ON
L1 L2L3
A1 Y33
3TK2840
Y34
Y11
Y21
Wiring Diagrams
3TK2845
Y22
Y12
K1
Wiring Diagrams
EMERGENCY OFF
3TK2850
Wiring Diagrams
A2
14
24
K2
3RA7
M
Literature
Updates
E-Stop, Cat. 4 acc. to EN 954-1, two-channel, with feedback circuit
Controls Division
SIRIUS Safety Relays
The Basic 3TK2840-... Electronic device
Safety Integrated
Safety Relays
Circuit example
Product Spectrum
ON
24V DC
3TK2840
L1 L2 L3
K1
Wiring Diagrams
A1 Y11 Y12 Y33 Y34
K1
3TK2840
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Y35 Y21 Y22 A2 14 24
Literature
Updates
K1
M
EMERGENCY OFF, Category 2 acc. to EN954-1, single-channel, with
feedback circuit
Controls Division
SIRIUS Safety Relays
The Basic 3TK2840-... Electronic device
Safety Integrated
Safety Relays
Circuit example
Product Spectrum
24V DC
L1 L2 L3
K1
3TK2840
K2
Wiring Diagrams
A1 Y11 Y12 Y33 Y34
Wiring Diagrams
K1
3TK2840
3TK2845
open closed
3TK2850
K2
Wiring Diagrams
Y35 Y21 Y22 A2
3RA7
14 24
K1 K2
Literature
M
Updates
Protective door monitoring, Category 3 acc. to EN954-1, two-channel,
with feedback circuit
Controls Division
SIRIUS Safety Relays
The standard 3TK2841 Electronic device
Safety Integrated
Safety Relays
Functions:
24V DC
• Category 4 acc. to EN954-1
Product Spectrum
A1 1
Y11
3TK2845
Y21
Y22
Y12
EMERGENCY
OFF
3TK2850
L1 L2 L3
Y32 Y34
K1
FET
K2
A2
14
3RA7
24V load
M
Updates
• Autostart, monitored start
• Controlling
- Safety mats
- Light Curtains and grids
Wiring Diagrams
Literature
• Protective door monitoring
• 1-2-channel sensor control
3TK2841
Wiring Diagrams
Wiring Diagrams
• EMERGENCY OFF
ON
3TK2840
24
• Can be cascaded
• 2 safety outputs
Controls Division
SIRIUS - The standard
3TK2842 Electronic device with time-delay
Safety Integrated
Safety Relays
L1 L2 L3
24V DC
Functions:
• Category 4 acc. to EN954-1
for instantaneous enable circuit
Product Spectrum
Y11 Y12 Y34
3TK2840
ON
A1
Wiring Diagrams
1
Y32
POWER
RUN
RUN T
FAIL
3TK2845
0
t
30
Wiring Diagrams
3TK28421.B40
Y20 Y21 A2
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
EMERGENCY
OFF
Y22 14
M
28
• Category 4 acc. to EN954-1 for time-delayed
enable circuit
(td=0.05-3, 0.5-30 seconds)
Controls Division
SIRIUS 3TK2845 Safety Relays
Product Range
Safety Integrated
Safety Relays
SIRIUS 3TK28 Safety Relays and Contactor Combinations
3TK282 / 3 Safety Relays
3TK2821-28 basic devices
3TK2830 expansion devices
Product Spectrum
3TK2834-35 press control devices
3TK2840
3TK284 Safety Relays and 3TK285 Contactor Combinations
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK284 without auxiliary contactors
3TK2840 basic device
3TK2841- 42 standard devices
3TK285 with auxiliary contactors
3TK2850
Wiring Diagrams
3RA7
Literature
3TK2850-53 basic device
3TK2856-57 expansion devices
3TK284 Safety Relay
3TK2845 multifunction device
Updates
3RA71 Safe Load Feeders
Controls Division
SIRIUS 3TK2845 Safety Relays
Application Example Category 4
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
Protective door
Feedback circuit
EMERGENCY-STOP
Key switch
Release circuits
ON
Controls Division
SIRIUS 3TK2845 Safety Relays
Highlights
Safety Integrated
Safety Relays
Product Spectrum
-
Possibility of wear-free operation with use of the electronic outputs
-
Connection of up to four input channels to one device
-
Cascadable, therefore expandable
-
Four safe outputs, two of which can
- Two with instantaneous stop (stop cat. 0)
3TK2840
- Two with time delay up to 300 sec (stop cat. 1)
Wiring Diagrams
-
Key switch connection for system service operation
3TK2845
-
Compact 45 mm enclosure
-
Factory-parameterized functions
-
Max. category 4 acc. to EN 954-1 and SIL3 acc. to IEC 61508
3TK2850
-
Permanent internal function control
Wiring Diagrams
-
Long electrical and mechanical service life
-
Approved for global market
Wiring Diagrams
3RA7
Literature
Updates
3TK2845-.BB40 stop cat. 0
Controls Division
SIRIUS 3TK2845 Safety Relays
Applications
Safety Integrated
Safety Relays
Function
-
Safety-oriented monitoring and disconnection of machines (e.g. EMERGENCY-STOP, protective door, ...)
-
Safe disconnection of system components by means of key switch (e.g. for service purposes, ...)
Application areas
Product Spectrum
3TK2840
Wiring Diagrams
-
Application with machines working in “isolated operation,” i.e. without connection to a bus system
-
Application with machines requiring two or more protective functions
(e.g. EMERGENCY-STOP and protective door)
-
(e.g. for service purposes)
3TK2845
Wiring Diagrams
3TK2850
Application with machines requiring the disconnection of components during running operation
Application fields
-
General processing machines
-
Packing machines
-
Injection molding machines
3RA7
-
Machine tools
Literature
-
Forming technology
-
Laser machines
-
Robot cells
-
Printing and paper machines
-
and others
Wiring Diagrams
Updates
3TK2845-.BB41/2/4 stop cat. 1
Controls Division
SIRIUS 3TK2845 Safety Relays
Technical Description
Safety Integrated
Safety Relays
-
-
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
-
o
Cascading input / operational switching (automatic start)
o
Sensor input (monitored start-up)
o
Sensor input (automatic start-up)
o
Key switch (automatic start-up)
Max. four safe outputs I – IV (stop cat. 0+1)
o
2x floating (relay contact)
o
2x non-floating (electronic output)
Attainment of up to safety category 4 acc. to EN 954-1 and SIL3 in acc. with IEC 61 508 possible
in dependence of external circuitry
-
Electronic signaling output
-
With / without crossover detection
-
1 or 2-channel connection possibility of the sensors
-
Connection of contacted sensors, e.g.
3TK2850
Wiring Diagrams
3RA7
Four sensor inputs
-
Literature
Updates
-
-
o
Cable-operated switches
o
EMERGENCY-STOP
o
Key switches
o
Position switches (protective door monitoring)
Connection of non-contacted sensors, e.g.
o
Light grids
o
Light curtains
o
Light barriers
o
Laser scanners
Connection of other sensors, e.g.
o
Connection of safety shut-off mats
o
Solenoid switch
Integration into the machine control based on “operational switching”
Controls Division
SIRIUS 3TK2845 Safety Relays
Functionality
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
Controls Division
SIRIUS 3TK2845 Safety Relays
Functionality Stop Category 0
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
Controls Division
SIRIUS 3TK2845 Safety Relays
Functionality Stop Category 0 + 1
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
Controls Division
SIRIUS 3TK2845 Safety Relays
Advantages in Comparison
L+(24V DC)
Safety Integrated
Safety Relays
L+(24V DC)
ON
L+(24V DC)
K1
K2
OFf
24 Y34
44
13
23
33
14
51
A2
14
24
34
52
23 Y33
Y21 Y22 A2
24 Y34
3TK2830-1BB40
Product Spectrum
A1 Y11 Y12 13
14
K3
K4
A1 Y11 Y12 13
23 Y33
Y21 Y22 A2
24 Y34
3TK2822-1CB30
Y21 Y22 A2
A1 43
3TK2822-1CB30
23 Y33
3TK2823-1CB30
A1 Y11 Y12 13
14
3TK2840
Wiring Diagrams
previously
M
3TK2845
-
K2
K3
Replaces up to four individual devices
K4
now
L+(24V DC)
 Device purchasing cost savings of up to 45 %
3TK2850
Wiring Diagrams
-
Fewer different devices, less inventory expenditures
 Cost savings of up to 50 %
-
No wiring of individual devices
A1 Y41 Y42 Y65 Y51 Y52 1
Y11 Y12 Y35 Y21 Y22
 Up to 40 % less wiring expenditures
3RA7
-
Literature
 Faster replacement in service cases
 Improved system availability
 Easy mounting / commissioning
Updates
-
13
14
24 Y72 Y82 A2
33
Compact device design
44 Y34 Y64 32
ON
 Spares up to 50 % control cabinet space
-
34
No parameterization/programming required
K1
M
K2
K3
K4
K1-K4
X
3TK2845-1BB40
Wiring Diagrams
K1
Controls Division
SIRIUS 3TK2850
Electronic Safety Relays with Contactor Relays
Safety Integrated
Safety Relays
From 3 to 1
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
Safety
electronics
+
=
Positively-driven contacts,
redundant structure
Controls Division
SIRIUS 3TK285.
Electronic Safety Combinations using Contactor Relays
Safety Integrated
Safety Relays
Features:
• Fulfills all applicable safety regulations
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
• Certified and accepted in accordance with
international and European Standards
• Suitable for the highest Category 4 in compliance
with EN954-1, or SIL 3 (Safety Integrity Level)
in compliance with IEC 61508
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
The following advantages are obtained by using
electronic components:
• High electrical lifetime by controlling the
contactor relays electronically (no wear)
• High contact reliability
Literature
Updates
• Fast switch-off times (< 40 ms)
• Permanent, cyclic self-test routine
Controls Division
SIRIUS 3TK285.
Electronic Safety Combinations using Contactor Relays
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Wiring Diagrams
Additional features:
3TK2845
• Floating enable circuit/signaling contacts
Wiring Diagrams
• Switching capability AC-15 6A at 230 V
3TK2850
• Switching capability DC-13 10A at 24 V
Wiring Diagrams
• Operating voltage 24V to 690V
3RA7
• Completely pre-wired and certified
safety combination
Literature
Updates
• Lower installation costs, few wiring errors
Controls Division
SIRIUS 3TK285.
Electronic Safety Combinations using Contactor Relays
Safety Integrated
Safety Relays
The "safety pilot" - an overview
Product Spectrum
3TK2840
Wiring Diagrams
Type
0
Stop Cat.
1
0
Stop Cat.
1
3TK2845
3TK2850
basic device
3
3NO
Wiring Diagrams
3TK2851
basic device
3
2NO
1NC
3TK2852
basic device
3
6NO
1NC
3RA7
3TK2853
basic device
4
3NO
1
3TK2856
expansion device
1)
Literature
6NO
1
3TK2857
expansion
device, td
1)
3TK2850
Wiring Diagrams
Updates
1) Category as for the basic device
3NO
1
1NC
Controls Division
SIRIUS 3TK285.
Electronic Safety Combinations using Contactor Relays
Safety Integrated
Safety Relays
The "safety pilot" - an overview
Product Spectrum
Switching
capability
3TK2840
Wiring Diagrams
Type
AC-15/230V
DC-13/24V
3TK2845
3TK2850
basic device
6A
10A
Wiring Diagrams
3TK2851
basic device
6A
10A
3TK2850
3TK2852
basic device
6A
10A
3RA7
3TK2853
basic device
6A
10A
Literature
3TK2856
expans. dev.
6A
10A
Updates
3TK2857
expans.dev.,td
6A
10A
Wiring Diagrams
Rated
control
supply
voltage
Rated
operating
voltage
24V DC
230V
690V AC
24V DC
24V
115V
230V AC
Controls Division
SIRIUS 3TK285.
Electronic Safety Combinations using Contactor Relays
Safety Integrated
Safety Relays
Circuit example
24V DC
M
Product Spectrum
3TK2840
ON
Wiring Diagrams
3TK2845
Wiring Diagrams
EMERGENCY
L1
OFF
L2
L3
A1
A2
1
Y11 Y12 Y21
2
Y22 Y23
Y32 Y33 Y34
PWR
3RA7
Literature
Updates
A2
3
4
READY
FAIL
K1
TK28511.B40
3TK2850
Wiring Diagrams
A1
Electronic safety
combination with auxiliary
contactors switch-off
elements for:
EMERGENCY OFF, 2-channel,
monitored start,
Cat. 4
Load
K2
Advantages
The following advantages are obtained by using
electronic components:
• High electrical lifetime by controlling contactor
relays wear-free
• High contact reliability
• Short switch-off times (< 40ms)
• Permanent, cyclic self-test routine
• Input for cascading
• Floating enable circuit, signaling contacts
• Electrical lifetime is increased by using contactor
relays which are switched alternating
• Additional safety electronic output
• Input for operational switching (PLC connection)
Controls Division
SIRIUS 3TK285.
Electronic Safety Combinations using Contactor Relays
Safety Integrated
Safety Relays
L/+
Product Spectrum
ON
A1 Y33
3TK2840
Y11
Y21
Wiring Diagrams
3TK2845
3TK2850
Y22
Y12
EMERGENCY
OFF
3TK2850
Wiring Diagrams
13 23 33
Y34
Wiring Diagrams
K1
K2
3RA7
A2
Literature
Updates
N/-
14 24 34
Controls Division
SIRIUS 3TK285.
Electronic Safety Combinations using Contactor Relays
Safety Integrated
Safety Relays
24V DC
ON
Product Spectrum
A1
3TK2840
PLC
Y32 Y33 Y34
1
3
13 23 33
4
Y11
Y21
Wiring Diagrams
Y22
Y12
3TK2845
EMERGENCY
OFF
K1
3TK2853
Wiring Diagrams
3TK2850
K2
Wiring Diagrams
3RA7
A2
2
Safety electronic output
Literature
-
Updates
Enable circuit Signaling circuit
3TK2851-...
2NO
1NC
3TK2852-...
6NO
1NC
14 24 34
Controls Division
SIRIUS 3TK285.
Electronic Safety Combinations using Contactor Relays
Safety Integrated
Safety Relays
Circuit example
Protective
door
24V DC
M
Product Spectrum
ON
3TK2840
Wiring Diagrams
EMERG.
OFF
A1 A2
1
Y11 Y12 Y20
Y21 Y22
Y32 Y33 Y34
2
A1 A2
3
A1 A2
4
1
PWR FAIL READY
K1
3TK2845
Wiring Diagrams
K2
K1
R
S
T
3RA7
Literature
Updates
Y21 Y22
Y32 Y33 Y34
2
A1 A2
3
4
PWR FAIL READY
Wiring Diagrams
3TK2850
Y11 Y12 Y20
Load
K2
Cascading EMERGENCY
OFF and monitored start,
protective door monitoring,
two-channel, Cat. 4
Controls Division
SIRIUS
3RA7. Safety Load Feeders
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Features:
 Suitable for the highest Category 4 acc. to EN 954-1,
and SIL 3 (Safety Integrity Level) acc. to IEC 61508
 Up to 7.5kW for 3-phase, 4 pole induction motors for
400VAC
 Sizes S0, S00
Wiring Diagrams
 Type of coordination 2 (also complies with type 1)
3TK2845
 Stop Categories 0 or 1
Wiring Diagrams
 Available in 24VDC and 230 VAC power supply
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
 Extremely compact design - SIRIUS Design
 Permanent, cyclic self-test routine
 No wear, as it switches electronically, therefore longer
lifetime
 No contact failures at low current/voltages
 High switching frequency
 Low switch-off times ( 20ms)
 Short-circuit proof and Vibration-free
Controls Division
New Literature
Safety Integrated
Safety Relays
Product Spectrum
3TK2840
Wiring Diagrams
3TK2845
Wiring Diagrams
3TK2850
Wiring Diagrams
3RA7
Literature
Updates
Banta order #
GCBR-06000-1203