Siemens SIRIUS System Manual

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

Siemens SIRIUS Specifications

General

Product brand name	Siemens
Series	SIRIUS
Coil Voltage	24V DC, 110V AC, 230V AC
Switching Capacity	Up to 10A
Mounting Type	DIN rail
Product designation	SIRIUS
Contact Material	Silver alloy
Contact Rating	Varies depending on the specific SIRIUS relay model (e.g., 6 A at 250 V AC, 10 A at 250 V AC)
Switching Voltage	Varies depending on the specific SIRIUS relay model (e.g., 250 V AC, 400 V AC)
Mechanical Life	Up to 10 million operations
Electrical Life	Up to 100, 000 operations
Operating Temperature	-25°C to +55°C
Protection Class	IP20
Size of relay base	Varies depending on the specific SIRIUS relay model