Siemens 3RH2911-1XA22-0MA7 Front Auxiliary Switch, 2NO+2NC, SIRIUS Original Brand New

Overview

The Siemens SIRIUS 3RH2911-1XA22-0MA7 is a high-quality, front-mountable auxiliary switch block designed for extending the signaling capabilities of SIRIUS control devices. Specifically engineered for seamless integration with Siemens 3RT2 power contactors and 3RH2 contactor relays, this 4-pole auxiliary switch is essential for reliable control circuit operation in industrial automation and electrical systems. It features a versatile 2 NO (Normally Open) + 2 NC (Normally Closed) contact configuration with secure screw terminals for straightforward, durable wiring.

Key Features & Specification

• Product Number: 3RH2911-1XA22-0MA7
• Brand: Siemens SIRIUS
• Product Type: Auxiliary Switch Block (Front Mount)
• Contact Configuration: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Contact Path Designation: 21/22 (NC), 31/32 (NC), 43/44 (NO), 53/54 (NO)
• Current Path: 1 NC, 1 NC, 1 NO, 1 NO
• Mounting: Front-mounted (Tool-free snapping onto contactor)
• Termination: Screw Terminals
• Compatibility: Designed for use with 3RT2 Contactors and 3RH2 Contactor Relays
• Functionality: Instantaneous auxiliary contacts for reliable control signal feedback.

Function

This auxiliary switch block serves to provide additional switching points (contacts) for the control circuit, enabling crucial functions such as:

1. Status Indication/Signaling: Allowing PLC or control system to monitor the on/off state of the main contactor.
2. Interlocking Circuits: Providing contacts for electrical interlocking with other devices to ensure proper sequence of operation.
3. Self-Holding/Latching: Creating the necessary feedback loop for starting circuits.
4. Positive Guidance: The contacts are positively driven, enhancing safety and reliability (especially when used with 3RH contactor relays).

Benefit

• Enhanced Reliability: Genuine Siemens SIRIUS component ensures long mechanical and electrical service life.
• Simple Installation: Front-mounting design allows for quick, tool-free assembly and disassembly onto the compatible contactors/relays, saving installation time.
• Versatile Control: Provides four essential auxiliary contacts (2NO/2NC) to handle complex control and signaling requirements.
• Secure Connection: Robust screw terminals guarantee a solid, reliable electrical connection suitable for demanding industrial environments.
• Optimized for SIRIUS: Perfect fit and performance integration with the widely used Siemens 3RT2 and 3RH2 series.

Application

The 3RH2911-1XA22-0MA7 auxiliary switch is indispensable in control and automation panels for:

• Motor Starters (DOL, Reversing, Star-Delta)
• Machine Control Systems
• HVAC and Pumping Systems
• Conveyor Systems
• Safety Circuits and Interlocks

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