3RH2911-2GA31
The Siemens SIRIUS 3RH2911-2GA31 is a front-mounted 4-pole auxiliary switch with 3 normally open and 1 normally closed (3 NO + 1 NC) contacts. It has a physical code and spring terminal connection. According to EN 50011, it can only be used with 3RH2140 and 3RH2440 contact relays to expand to an 8-pole contact combination.
Product Positioning
The 3RH2911-2GA31 is a SIRIUS 3RH29 physical coded auxiliary switch, designed specifically for 3RH2140 and 3RH2440 contact relays. The combined terminal number conforms to EN 50011 and is suitable for PLC peripheral signal amplification, logic control and multi-point interlocking circuits.
Core Product Advantages and Features
Physical coding to prevent misinstallation
The mechanism has a physical code and can only be installed on a designated contact relay to avoid misconfiguration that could cause terminal number confusion.
Compliant with EN 50011
The terminal markings after assembly conform to EN 50011 standards, and the drawings are consistent with the field wiring, making maintenance and interpretation easy.
3 normally open and 1 normally closed contacts
It provides 4 sets of contacts, 3 normally open and 1 normally closed, which, when combined with the contact relay body, form an 8-pole contact configuration.
Spring terminal connection
Spring terminals eliminate the need for screws, are vibration-resistant, save time on wiring, and are suitable for large-scale wiring and equipment vibration environments.