Table 6-4: Selection Criteria For The 3Rh, 3Tx, And Lzx Coupling Links - Siemens sirius System Manual

Mechanical require-
ments
Selection table
SIRIUS System Manual
GWA 4NEB 430 0999-02b
• Construction type, width
• Mounting type
• Indicators
• Connection type
• Replaceability
The following table provides an overview of the main criteria for selection
from different device groups:
Device group
Two-tier coupling links
Coupling links in box terminal
format
Contactor relays for switching
main and auxiliary circuits
Plug-in relay coupling links
Coupling links for attachment
to contactors

Table 6-4: Selection criteria for the 3RH, 3TX, and LZX coupling links

3RH, 3TX, LZX coupling links
Criteria for selection
• Space-saving due to narrow housing width
• Test switches
• Low device height
• For installation given narrow tier spacing
• High switching currents
• Direct switching of motors up to 11 kW
• Up to 4 auxiliary contacts
• High switching currents
• Quickly interchangeable
• Up to 4 changeover contacts
• Attachable directly onto the contactor
• Technical specifications of the contactor to be con-
trolled
6-11