Siemens SIRIUS System Manual

3RH, 3TX, LZX coupling links
SIRIUS System Manual
GWA 4NEB 430 0999-02b
6-9
6.2.8 Explanation of terms
Electrical isolation
There is no conductive connection between the input circuit and the output
circuit. Electrical isolation is ensured by the in-built relay and, in the case of
semiconductor outputs, by means of optocouplers.
Safe isolation
Safe isolation provides protection against shock currents in different circuits.
It is implemented by means of increased creepages and clearances.
Distinction between
terms
Electrical isolation is not necessarily safe isolation.
Safe isolation is a protective measure against shock current, the primary
purpose of which is to prevent injury. It prevents the voltage of one circuit
crossing over into another.
For the insulation coordination of equipment, the standard specifies values
for the rating of the creepages and clearances.
In the case of safe isolation, these values must be selected by means of
double or reinforced insulation.

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