Siemens SIRIUS 3RH2911-1FA04 Front Mount Auxiliary Switch Block, 4 NC, Screw Terminal Original Brand New

Overview

The Siemens SIRIUS 3RH2911-1FA04 is a high-quality, instantaneous front-mounted auxiliary switch block designed for use with SIRIUS 3RT2 power contactors and SIRIUS 3RH2 contactor relays. This essential accessory expands the control circuit capabilities of your contactor system by adding four Normally Closed (4 NC) auxiliary contacts. Installation is tool-free via a simple snap-on mechanism on the front face of the base unit. Equipped with reliable screw terminals, the 3RH2911-1FA04 ensures secure and straightforward wiring in industrial control applications.

Key Features & Specification

• Product Type: Auxiliary Switch Block (Front Mount)
• Manufacturer: Siemens
• Series: SIRIUS 3RH29
• Contact Configuration: 4 NC (Normally Closed) instantaneous contacts
• Terminal Type: Screw Terminals
• Mounting: Front snap-on mounting (tool-free)
• Compatibility: Designed for use with Siemens SIRIUS 3RT2 contactors (sizes S00, S0, S2) and 3RH2 contactor relays
• Current Path: 1 NC, 1 NC, 1 NC, 1 NC
• Mechanical Service Life: Up to 10 million operating cycles (typical)
• Insulation Voltage (Ui): 690 V (with pollution degree 3)
• Protection Class: IP20 on the front
• Catalogue Number (MLFB): 3RH2911-1FA04

Function

The 3RH2911-1FA04 auxiliary switch is specifically designed for switching control signals in the control circuit. It provides supplementary contacts for:

1. Signaling and Indication: Providing feedback on the main contactor’s switching status to PLCs, HMI, or signaling lights (e.g., fault indication, status monitoring).
2. Interlocking Circuits: Implementing safety and logic functions, such as preventing two contactors from closing simultaneously (electrical interlocking).
3. Auxiliary Control: Supplying auxiliary power or control signals to other components in the control panel.
4. Safety Applications: The conventional front auxiliary contacts fulfill the characteristics of force-guided operation (positively driven contacts in 3RH contactor relays), making them suitable for safety-related applications as per IEC 60947-5-1.

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