Siemens 3RH2911‑4HA03 Auxiliary Switch Block 3 NC, Front Mount, Ring Cable Lug, For 3RT2 / 3RH2 Contactors Original Brand New

Overview

The Siemens 3RH2911‑4HA03 is an auxiliary switch block designed for front‑mounting on Siemens SIRIUS series contactors (3RT2 and 3RH2). It features three normally‑closed (NC) contacts and a dedicated current path of 1 NC + 1 NC + 1 NC. The product uses ring cable lug connection for secure wiring and is ideal for expanding auxiliary contact functionality in industrial control panels and motor starter circuits.

Benefit

• Improved Control Circuit Capability: Adding auxiliary contacts expands the functionality of your contactor setup — for signal feedback, interlocking, status indication, or fault detection.

• Space‑saving Front Mount Design: The front‑mount design on SIRIUS contactors keeps the footprint compact and simplifies wiring and servicing.

• Enhanced Reliability & Safety: Siemens engineering ensures the component meets rigorous industrial standards, minimizing downtime and maintenance.

• Flexible Integration: With the ring cable lug connection and standard mounting, integration into existing control panels is straightforward.

• Long Service Life: Designed for industrial environments and frequent switching operations — backing your installation with durability.

Application

• Industrial motor control panels and starter assemblies using SIRIUS 3RT2 or 3RH2 contactors.

• Secondary control circuits requiring auxiliary contact feedback for PLCs, safety systems or signalling.

• Machine control cabinets, automation systems, and motor starter panels where compact, modular auxiliary blocks are required.

• Retrofitting or upgrading existing control systems to add additional auxiliary contacts without replacing the main contactor.

Installation & Usage Tips

1. Ensure compatibility with your host contactor model (SIRIUS 3RT2 or 3RH2) before mounting.

2. Use the ring cable lugs as specified by the manufacturer to ensure proper connection and torque.

3. Before powering the system, verify correct auxiliary contact wiring (.1/.2 terminals) and proper operation of NC contacts in your control scheme.

4. If this version is discontinued (as noted), check for availability or consider the successor model 3RH2911‑1HA03 for future purchases.

5. Keep the auxiliary block accessible for maintenance or inspection in the control panel design.

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