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

Product Overview

The Siemens 3RH2911-1HA11 is a front-mounted auxiliary switch featuring 1 NO + 1 NC contacts, designed for use with contactors 3RT2 and contactor relays 3RH2. This SIRIUS auxiliary switch block provides a current path of 1 NC, 1 NO, --, -- with terminal designations .1/.2, .3/.4, --/--, --/--.

Key Features:

• Contact Configuration: 1 NO + 1 NC contacts (1 normally open + 1 normally closed)
• Current Path: 1 NC, 1 NO, --, -- sequence
• Mounting Type: Front mounting for easy installation
• Terminal Type: Screw terminal connections
• Compatibility: For use with 3RH2 contactor relays and 3RT2 contactors
• Size Compatibility: Size S00 to S3 contactors

Terminal Designations: Terminal assignments are .1/.2, .3/.4, --/--, --/-- following the current path sequence of 1 NC, 1 NO with two unused positions.

Technical Specifications:

• Current Rating: 10A AC, 6A DC
• Voltage Rating: 690V AC, 250V DC
• Number of Poles: 2-pole configuration
• Cable Acceptance: Accepts cables up to 2 x 2.5mm²
• Installation: 1 block per contactor, 1 block per relay maximum
• Protection Rating: IP20

Installation Advantages: The front-mounted 3RH29 auxiliary switches can be installed on 3RT2 contactors and 3RH2 contactor relays without the need for tools, regardless of size. The auxiliary switch block features a snap-on design for easy installation and removal.

Applications: Part of the SIRIUS 3RH29 auxiliary switch series for the expansion of auxiliary contacts in the control circuit. Ideal for control applications requiring additional normally open and normally closed contacts for signaling, interlocking, or feedback functions in industrial automation systems.

Design Features: The auxiliary switches can be designed as positively driven contacts in 3RH contactor relays or as mirror contacts in 3RT power contactors. Available with screw terminal and spring-type terminal connections for flexible installation options.

Compatibility Range: Compatible with SIRIUS 3RH2 contactor relays and SIRIUS 3RT2 contactors in sizes S00, S0, S2, and S3. The versatile range provides quick retrofit and replacement capabilities across different contactor sizes.

Expandability: The 3RH19/3RH29 auxiliary switches are available as versions for front or lateral mounting, with up to four instantaneous contacts or up to two leading NO and NC contacts. Multiple auxiliary switch blocks can be combined for expanded functionality.

Frame Size Compatibility:

• Size S00: Width 45mm
• Size S0: Width 45mm
• Size S2: Width 55mm
• Size S3: Width 70mm

Physical Specifications:

• Net Weight: 0.047 kg
• Package Dimensions: 50.00 x 57.00 x 42.00 mm
• Gross Weight (incl. package): 0.045 kg
• Country of Origin: Czech Republic

Standards & Compliance:

• EAN: 4011209829381
• UPC: 662643910063
• 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