Siemens SIRIUS 3RH2911-2HA03 Front-Mounted Auxiliary Switch, 3 NC Contacts, Spring-Type Terminal Original Brand New

Overview

The Siemens SIRIUS 3RH2911-2HA03 is a genuine, high-quality front-mounted auxiliary switch block designed to easily expand the control circuit functionality of SIRIUS modular system contactors and relays. Featuring three normally closed (3 NC) instantaneous contacts and reliable spring-loaded terminals (also known as spring-type or cage clamp connection), this auxiliary switch block ensures secure, vibration-proof wiring and tool-free mounting. It is an essential component for complex control applications requiring reliable interlocking and signaling.

Key Features & Specifications

• Product Number: 3RH2911-2HA03
• Brand: Siemens SIRIUS
• Type: Auxiliary Switch Block (Front-Mounted)
• Contact Configuration: 3 NC (Normally Closed) Instantaneous Contacts
  • Contact Path: 1 NC, 1 NC, 1 NC
  • Terminal Marking: .1/.2, .1/.2, .1/.2, --/--
• Terminal Type: Spring-Type Terminal (Spring-Loaded Terminal / Cage Clamp)
• Compatibility: Specifically designed for use with Siemens 3RT2 Power Contactors and Siemens 3RH2 Contactor Relays (fits sizes S00, S0, S2, S3).
• Mounting: Tool-free snap-on installation onto the front face of the base unit.
• Protection Class (Front): IP20
• Rated Operational Current (AC-15, 230V): 6A
• Mechanical Service Life: Typically 10,000,000 operating cycles.

Benefit

• Enhanced Control Circuit Functionality: Quickly and reliably adds three control contacts for interlocking, signaling, and sequence control.
• Fast, Secure Wiring (Spring-Type Terminal): The innovative spring-loaded terminal connection eliminates the need for tools, reduces wiring time, and provides high contact stability, especially in environments with vibration.
• Maximum Compatibility: Seamlessly integrates with the extensive Siemens SIRIUS 3RT2 contactor and 3RH2 contactor relay families, ensuring a perfect fit and consistent performance.
• Robust and Reliable: Built to Siemens' high-quality standards with a high mechanical service life for long-term operational reliability in industrial environments.
• Simple Installation: Front-side snap-on mounting allows for quick, tool-free assembly and disassembly, minimizing downtime during installation or replacement.

Application/Function

The Siemens 3RH2911-2HA03 auxiliary switch is used in industrial automation and control systems to:

1. Status Indication: Signal the open or closed state of the main contactor to PLCs or indicator lights.
2. Electrical Interlocking: Ensure safe sequencing of operations, preventing two contactors from being energized simultaneously.
3. Auxiliary Control: Provide additional Normally Closed contacts for control logic, such as switching coils or other low-power loads.
4. Mirror Contacts (in 3RT2): Can be designed as mirror contacts to meet functional safety requirements, providing a reliable indication of the main contactor's contact position.

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