Siemens 3RH2911-2NF02 SIRIUS Auxiliary Switch 2 NC, Solid-State Compatible, Front Mount, Spring-Loaded Original Brand New

Overview

The Siemens 3RH2911-2NF02 is a solid-state compatible auxiliary switch from the SIRIUS line, designed for front-mounting on Siemens 3RT2 power contactors and 3RH2 contactor relays. This auxiliary switch provides two normally closed (2 NC) contacts, ideal for extending the control and signaling capabilities of your contactor or contactor relay. Its spring-loaded terminals ensure fast, secure, and vibration-resistant wiring.

Key Features & Benefit

• Seamless Integration: Specifically engineered for compatibility with Siemens 3RT2 contactors and 3RH2 contactor relays, ensuring a perfect fit and reliable operation.
• Solid-State Compatible: Designed to work flawlessly with solid-state devices, providing reliable switching for modern control systems.
• Enhanced Functionality: Adds two normally closed (2 NC) auxiliary contacts to your main contactor, expanding its application possibilities for signaling and control circuits.
• Easy Front Mounting: Mounts directly on the front of the contactor, saving space and simplifying installation within control cabinets.
• Spring-Loaded Terminals: Offers quick, tool-free wiring. These terminals provide a consistent, high-pressure connection that is resistant to loosening from vibration, ensuring long-term reliability.
• Clear Identification: The auxiliary contacts follow standard Siemens terminal designations (e.g., .1/.2) for easy identification and wiring.
• Durable and Reliable: Built with high-quality materials to meet Siemens’ stringent standards, ensuring a long operational life in demanding industrial environments.

Technical Specification

• Product Type: Auxiliary Switch
• Product Number: 3RH2911-2NF02
• Mounting Type: Front Mount
• Contact Configuration: 2 NC (Normally Closed)
• Solid-State Compatibility: Yes
• Current Path: 1 NC (solid-state compatible), –, –, 1 NC (solid-state compatible)
• Terminal Type: Spring-Loaded Terminal
• Compatibility: For use with Siemens 3RT2 contactors and 3RH2 contactor relays.

Terminal Designations & Identification Number

• Terminal Designations: The terminals are identified by a 2-digit number (e.g., 21, 22).
  • Tens Digit: Sequence digit. Related terminals share the same sequence digit.
  • Units Digit: Function digit. 1-2 for Normally Closed (NC) contacts.
• Identification Number: The auxiliary switch’s configuration is identified by a 2-digit number, where the first digit represents the number of NO contacts and the second digit represents the number of NC contacts. For the 3RH2911-2NF02, this is effectively 02 (0 NO, 2 NC).

Application

This auxiliary switch is essential for various industrial control applications, including:

• Signaling and Status Indication: Providing signals to PLCs, HMIs, or indicator lights to show the status of the main contactor (e.g., open/closed).
• Interlocking Circuits: Creating safety and control interlocks to prevent simultaneous operation of conflicting equipment.
• Control Logic: Expanding the control logic of a circuit without requiring a separate control relay.

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