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Siemens SIRIUS System Manual

Siemens SIRIUS
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3RH, 3TX, LZX coupling links
SIRIUS System Manual
6-10
GWA 4NEB 430 0999-02b
6.3 Application and areas of use
6.3.1 General information
Advantages
The use of coupling links offers the following advantages:
Galvanic isolation between two circuits
Current gain
Protects the controller from interference and overvoltage
Substantially reduces the power input of switchgear
Permits power gain or level adaptation
Applications
Coupling links are used in:
Production engineering
Machine setup
Process control in power distribution
Building services automation
Process engineering
Usage
Coupling links are used for:
Floating signal transmission
Linking of different voltages (AC/DC) and currents
Power gain
Level adaptation
Protection of the controller against EMC noise from the I/O
Contact multiplication
Application example
Figure 6-3: Application example, coupling links in box terminal format
6.3.2 Criteria for selection
Coupling links are selected on the basis of a number of criteria:
Technical specifications
See Section 6.7:
Rated control supply voltage U
s
Typical power input
Output elements
Rated operational currents I
e
Permissible line length
M
110 VAC
230 VAC
24 VDC 24 VDC
110 VAC
230 VAC
Final control-
ling element
Electronic
controller
I/O
Devices
In-
put
Out-
put
Pushbutton
Position
switch
Coupling
link
Coup-
ling
link
Motor
contactor

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Siemens SIRIUS Specifications

General IconGeneral
Product brand nameSiemens
SeriesSIRIUS
Coil Voltage24V DC, 110V AC, 230V AC
Switching CapacityUp to 10A
Mounting TypeDIN rail
Product designationSIRIUS
Contact MaterialSilver alloy
Contact RatingVaries depending on the specific SIRIUS relay model (e.g., 6 A at 250 V AC, 10 A at 250 V AC)
Switching VoltageVaries depending on the specific SIRIUS relay model (e.g., 250 V AC, 400 V AC)
Mechanical LifeUp to 10 million operations
Electrical LifeUp to 100, 000 operations
Operating Temperature-25°C to +55°C
Protection ClassIP20
Size of relay baseVaries depending on the specific SIRIUS relay model

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