Siemens SIRIUS System Manual

3RH, 3TX, LZX coupling links
SIRIUS System Manual
6-6
GWA 4NEB 430 0999-02b
6.2.3 Plug-in relay coupling links
The Plug-in relay coupling links are modular coupling links. The plug-in for-
mat means the relays can be easily replaced.
Models
There are complete modules for 1 and 2 changeover contacts and individual
modules for 1, 2, 3 or 4 changeover contacts for a rated control supply volt-
age of either 24 VDC or 230 VAC.
Widths
Plug-in relay coupling links are available in 3 widths:
• 15.5 mm print relays, LZX: RT variants
• 27 mm mini-industrial relays, LZX: PT variants
• 38 mm industrial relays, LZX: MT variants
Installation
The plug-in relay coupling links are plugged into the associated bases, and
these are snapped onto a 35 mm rail in acc. with EN 50 022.
Surge suppression
To avoid high breaking voltage peaks, LZX: RT and PT plug-in relay coupling
links are available for a rated control supply voltage of 24 VDC, with 1, 2, or
4 changeover contacts (Ws) and integrated surge suppression (flywheeling
diode). RC elements are available for AC voltages.
Connection
The standard polarity must be taken into consideration when connecting up:
• At A1: positive voltage supply (+)
• At A2: negative voltage supply (-)
Test button
The LZX: PT and MT variants are equipped with a test button. The plug-in
relay coupling link can thus be brought into the switching state and locked
without the need for electrical triggering. When the test button is protrud-
ing, this indicates the locked switching position.
LED
An LED is available either as an individual plug-in module or is integrated in
the relay, depending on the variant involved.
Power consumption
Following on from the technical specifications of the electronic systems, the
coupling links have low power consumption.
Safe isolation
The drive circuit and contacts are electrically isolated. Safe isolation can also
be achieved for the print relays (LZX:RT series) by means of a special base.

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