Siemens Auxiliary switch on the front, 3NO + 1NC

Product Overview

The Siemens 3RH2911-1GA31 is a front-mounted auxiliary switch featuring 3 NO + 1 NC contacts, specifically designed for use with contactor relays 3RH2140 and 3RH2440. This SIRIUS auxiliary switch block provides a current path of 1 NO, 1 NC, 1 NO, 1 NO with terminal designations 53/54, 61/62, 73/74, 83/84, and is physically coded for compatibility according to EN 50011 standards.

Key Features:

• Contact Configuration: 3 NO + 1 NC contacts (3 normally open + 1 normally closed)
• Current Path: 1 NO, 1 NC, 1 NO, 1 NO sequence
• Mounting Type: Front mounting for Size S00 contactor relays
• Terminal Type: Screw terminal connections
• Physical Coding: Ensures compatibility only with specified contactor relays
• Specific Compatibility: Only with contactor relays 3RH2140 and 3RH2440

Terminal Designations: Terminal assignments are 53/54, 61/62, 73/74, 83/84 following the current path sequence of 1 NO, 1 NC, 1 NO, 1 NO.

Technical Specifications:

• Current Rating: 6A current rating at AC-15, 230V
• Size: Size S00 for contactor relays
• Cable Acceptance: Accepts cables up to 2 x 2.5mm²
• Installation: 1 block per contactor, 1 block per relay maximum
• Identification Number: 71E according to EN 50011
• Number of Changeover Contacts: 0
• Number of Fault-Signal Switches: 0

Installation Advantages: The front-mounted 3RH29 auxiliary switches can be installed on 3RH2 contactor relays without the need for tools. The auxiliary switch block can easily be snapped onto the front of the contactors and has a centrally positioned release lever for disassembly.

Applications: Part of the SIRIUS 3RH29 auxiliary switch series for the expansion of auxiliary contacts in the control circuit. Specifically designed for four-pole industrial control relays including 3RH2122, 3RH2131, or 3RH2140 models, providing an additional 4 signaling contacts for control functions, interlocking, and safety applications.

EN 50011 Compliance: The contactor relays with 4 contacts according to EN 50011, with the identification number 40E, can be extended with 80E to 44E auxiliary switch blocks to obtain contactor relays with 8 contacts according to EN 50011. The identification numbers 80E to 44E on the auxiliary switch blocks apply to the complete contactors.

Physical Coding: Features physical coding to ensure proper installation and compatibility. Only compatible with contactor relays 3RH2140 and 3RH2440, preventing incorrect installation and ensuring system integrity.

Expandability: Only one 3RH2911-1GA31 auxiliary can be installed per contactor relay. The auxiliary switches can be designed as positively driven contacts in 3RH contactor relays, providing reliable switching for safety applications and control functions.

Compatibility Range: Specifically designed to mount to the front of any 3RH2122, 3RH2131, or 3RH2140 four-pole industrial control relay. The auxiliary switches are available as versions for front or lateral mounting, with up to four instantaneous contacts.

Physical Specifications:

• Net Weight: 0.058 kg
• Package Dimensions: 50.00 x 60.00 x 43.00 mm
• Country of Origin: Czech Republic

Standards & Compliance:

• EAN: 4011209829442
• UPC: 662643910001
• RoHS: Compliant since 01.10.2009
• WEEE: Take-back obligation applies

Download existing graphical data for this product:

• Product Datasheet PDF
• Technical Data Sheet
• Official Siemens Product Page
• Installation Guidelines
• Technical Specifications