Siemens 3RH2911-1HA03 Auxiliary Switch, Front-Mounted Auxiliary Contact for 3RT2 Contactors & 3RH2 Relays Original Brand New

Overview

The Siemens 3RH2911-1HA03 is a high-quality front-mounted auxiliary switch engineered for reliable performance in industrial control systems. Designed with 3 Normally Closed (3NC) contacts, this auxiliary unit ensures safe and efficient circuit signaling. It is fully compatible with Siemens 3RT2 contactors and 3RH2 contactor relays, making it an ideal component for control panels, automation setups, and machine operation environments requiring durable and precise auxiliary switching.

With screw terminal connections and standardized Siemens reliability, this auxiliary switch provides easy installation, strong mechanical endurance, and dependable performance for long-term operation.

Benefit

• Reliable auxiliary signaling with 3 NC contact configuration

• Compatible with Siemens 3RT2 and 3RH2 devices

• Durable screw terminal design ensures secure wiring

• Front-mounted construction for easy access and installation

• Engineered for industrial-grade performance

• Enhances safety and control accuracy in automation systems

Function/Application

The primary function of the 3RH2911-1HA03 is to provide auxiliary switching capability proportional to the state of the main contactor.

1. Status Indication: The NC contacts open when the main contactor is energized, allowing an indicator light or PLC input to register the contactor’s operational state.

2. Interlocking Circuits: Essential for safety and sequence control, the NC contacts can be wired in series with another contactor’s coil to prevent simultaneous operation (a common safety interlock).

3. Expanded PLC I/O: Provides dedicated, hard-wired feedback signals to a Programmable Logic Controller (PLC).