Siemens SIRIUS 3RH2911-1FA40 Front Auxiliary Switch Block, 4 NO Contacts, For 3RT2, 3RH2 Contactor Relays Original Brand New

Overview

The Siemens SIRIUS 3RH2911-1FA40 is a high-performance, front-mounting auxiliary switch block designed for seamless integration with the Siemens SIRIUS 3RT2 power contactors and 3RH2 contactor relays. This essential control component expands the auxiliary contact capacity, providing reliable signaling and control circuit functionality for industrial automation applications.

Key Features & Specification

• Product Type: Auxiliary Switch Block (Front Mounting)
• Manufacturer: Siemens (SIRIUS product line)
• Part Number: 3RH2911-1FA40
• Contact Configuration: 4 NO (Normally Open) instantaneous contacts
• Current Path Coding: .3/.4, .3/.4, .3/.4, .3/.4 (Each path is 1 NO)
• Connection Type: Screw Terminals
• Compatibility: Designed for use with SIRIUS 3RT2 contactors and 3RH2 contactor relays.
• Mounting: Snap-on mounting on the front of the base unit.
• Rated Insulation Voltage (Ui): 690 V (AC)
• Protection Class (Front): IP20
• Mechanical Service Life: Up to 10 million operating cycles (typical)

Benefit

• Easy Integration: Features a simple snap-on mounting mechanism for quick, tool-free installation directly onto the front of compatible 3RT2 contactors and 3RH2 contactor relays, minimizing downtime and installation effort.
• Enhanced Control: Adds four independent Normally Open (NO) auxiliary contacts, significantly increasing the capacity for control, monitoring, and signaling within complex circuits.
• Reliable Performance: Part of the trusted Siemens SIRIUS modular system, ensuring high contact reliability and a long electrical and mechanical lifespan.
• Secure Wiring: Utilizes robust screw terminals for secure and industry-standard electrical connection of auxiliary and control circuits.

Function / Application

The 3RH2911-1FA40 Auxiliary Switch serves to multiply the number of auxiliary contacts available on a contactor or contactor relay. It is primarily used in control circuits to:

• Signal Status: Provide feedback to PLCs, indicator lights, or other control devices regarding the energized (closed) state of the main contactor.
• Interlock Circuits: Create safety or sequential logic interlocking conditions.
• Control Multiple Loads: Switch small control circuit loads simultaneously with the main contactor.

Typical Applications: Motor control, machine building, HVAC systems, and general industrial automation where reliable signaling from the main contactor/relay is required.

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