Siemens Auxiliary switch, front mount, 2NO + 2NC Part number 3RH2911-2GA22

Product Overview

The Siemens 3RH2911-2GA22 is a snap-on auxiliary-switch block from the SIRIUS 3RH29 series, designed to attach to compatible contactor relays (size S00) and provide additional auxiliary contacts for control or signalling circuits. It enhances the switching functionality of contactors, allowing the integration of extra control paths without altering the main power circuit.

Key Features

• Auxiliary switch block (front-mount, snap-on) for SIRIUS contactor relays size S00
• Contact configuration: 2 NO + 2 NC instantaneous auxiliary contacts
• Spring-loaded terminals for secure and easy wiring
• Compact design — minimal footprint when mounted on contactor relay
• Insulation voltage rating 690 V (pollution degree 3) and surge-voltage resistance 6 kV
• Protection class (front) IP20 — suitable for standard control-gear environments
• Mechanical service life: approx. 10,000,000 switching operations
• Electrical endurance (AC-15 at 230 V): approx. 200,000 switching operations

Technical Specifications

• Article Number: 3RH2911-2GA22
• Product Family: SIRIUS 3RH29 auxiliary-switch blocks
• Contact Configuration: 2 × Normally Open (NO) + 2 × Normally Closed (NC)
• Terminals: Spring-loaded clamp terminals
• Rated Insulation Voltage (Ui): 690 V AC (pollution degree 3)
• Impulse Withstand Voltage (Uimp): 6 kV
• Rated Contact Currents (Auxiliary Contacts):
  • AC-12 (resistive): 24 V, 10 A; 230 V, 10 A
  • AC-14 (inductive): 125 V, 6 A; 250 V, 6 A
  • AC-15 (control switching): 24 V, 6 A; 230 V, 6 A; 400 V, 3 A
  • DC-12: 24 V, 10 A; 110 V, 3 A; 220 V, 1 A
• Mechanical Service Life: approx. 10,000,000 operations
• Electrical Endurance (AC-15 / 230 V): approx. 200,000 operations
• Protection Class (front): IP20
• Mounting: Snap-on front mount to compatible contactor relay (size S00)
• Compatibility: Designed for use with SIRIUS 3RH2-series contactor relays S00 / specified models as per Siemens guidelines

Compliance & Certifications

• Manufactured under Siemens SIRIUS product-standard requirements for contactor accessories
• Designed for safe auxiliary switching in industrial control and automation systems
• Suitable for integration in control cabinets under standard low-voltage control-gear specifications

Applications

The 3RH2911-2GA22 auxiliary-switch block is used to add auxiliary contacts to contactor relays — to implement control-circuit switching, signalling, status feedback, interlocks or auxiliary functions without modifying the main power path. Typical uses include motor-control panels, automation systems, HVAC control, machine panels and other industrial or commercial installations where additional low-power contacts are required for control logic, alarms, or interface circuits.