Siemens SIRIUS 3RH2911-1FA22-0MA0 Front Auxiliary Switch Block, 2 NO + 2 NC, Screw Terminal, for 3RT2 and 3RH2 Contactor Original Brand New

Overview

The Siemens SIRIUS 3RH2911-1FA22-0MA0 is a high-performance, instantaneous front auxiliary switch block designed for seamless integration with SIRIUS 3RT2 Power Contactors and SIRIUS 3RH2 Contactor Relays. This essential accessory expands the control circuit capabilities of your motor and contactor applications, providing reliable switching feedback and logic. With its straightforward snap-on front mounting and secure screw terminal connection, it simplifies installation and maintenance in industrial automation environments.

Key Technical Specification

• Product Type: Front Auxiliary Switch Block (Instantaneous)
• Article Number (MPN): 3RH2911-1FA22-0MA0
• Contact Configuration: 4 Contacts Total
  • 2 NO (Normally Open) Contacts
  • 2 NC (Normally Closed) Contacts
• Current Path Configuration: 1 NO, 1 NO, 1 NC, 1 NC
• Terminal Designation: .3/.4, .3/.4, .1/.2, .1/.2
• Connection Type: Screw Terminal
• Mounting: Front Snap-on Mounting
• Compatibility: Designed for Siemens 3RT2 Contactors and 3RH2 Contactor Relays
• Brand/Series: SIRIUS
• Rated Insulation Voltage (Ui): 690V
• Rated Operational Current (Ie) at AC-15, 230V: 6A
• Safety Features (Select Models): Mirror contact (with 3RT2), Positively driven operation (with 3RH2)

Benefit & Features

• Expanded Functionality: Easily adds four instantaneous auxiliary contacts (2 NO + 2 NC) to increase the control circuit capacity of base devices.
• High Reliability: Features a long mechanical service life (typically 10 million operating cycles) and excellent contact reliability.
• Simple Installation: Front snap-on mounting allows for quick and tool-free installation directly onto the contactor or contactor relay.
• Secure Connection: Robust screw terminals ensure a strong, reliable, and vibration-resistant electrical connection.
• Versatile Use: Suitable for both SIRIUS 3RT2 power contactors (as mirror contact) and SIRIUS 3RH2 contactor relays (as positively driven contact) for safety and control applications.
• Quality Assurance: Genuine Siemens SIRIUS product, compliant with international standards like IEC 60947-5-1.

Function

The 3RH2911-1FA22-0MA0 auxiliary switch operates simultaneously with the main contactor or relay, providing additional switching points for control circuits, signal lights, interlocking, or feedback to PLCs.

• The NO (Normally Open) contacts close when the main contactor is energized.
• The NC (Normally Closed) contacts open when the main contactor is energized.
• The designated terminal markings (e.g., .1/.2 for NC, .3/.4 for NO) adhere to standard control circuit numbering for clear wiring and diagnostics.

Application

This auxiliary switch block is essential for various control tasks in industrial automation, including:

• Motor control circuits (e.g., starting/stopping, interlocking).
• Control panel signalization (indicator lights).
• Safety circuits requiring feedback or positively driven contacts.
• General relay and contactor extension in control systems.

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