Siemens 3RH2911-4NF11 Front Auxiliary Switch, 1 NO + 1 NC, Solid-State Compatible, Ring Cable Lug Connection Original Brand New

Overview

The Siemens 3RH2911-4NF11 is a high-performance, front-mounted auxiliary switch block designed specifically to enhance the functionality and signaling capabilities of SIRIUS 3RT2 power contactors and 3RH2 contactor relays. This component is essential for modern control applications requiring reliable interfacing with PLC inputs.

Key Features and Specifications

• Product Number: 3RH2911-4NF11

• Mounting Position: Front-mounted

• Contact Configuration: 1 NO + 1 NC (1 Normally Open, 1 Normally Closed)

• Compatibility: Solid-State Compatible (Ideal for low-current PLC inputs)

• Connection Type: Ring Cable Lug Connection

• Suitable for: Siemens SIRIUS 3RT2 Contactors and 3RH2 Contactor Relays

• Current Path Coding:

  • 1 NO Contact: .3 / .4 (Solid-state compatible)

  • 1 NC Contact: .1 / .2 (Solid-state compatible)

Benefit

• Enhanced System Compatibility: The solid-state compatibility ensures reliable switching for very low currents, making it perfect for direct interfacing with modern Programmable Logic Controllers (PLCs) and digital input modules.

• Space and Time Savings: Its front-mounting design allows for quick installation and removal without requiring additional side space, simplifying panel design and maintenance.

• Robust Connection: The ring cable lug connection provides a secure and vibration-resistant terminal, guaranteeing stable and long-term electrical performance in industrial environments.

• Flexible Signaling: Provides both NO (make) and NC (break) contacts simultaneously, offering comprehensive status signaling (e.g., “Contactor ON” and “Contactor OFF” signals) within the control circuit.

Function

The 3RH2911-4NF11 auxiliary switch physically snaps onto the front face of a compatible Siemens contactor (3RT2) or contactor relay (3RH2). When the main coil of the host device is energized, the mechanical action transfers to the auxiliary switch contacts:

1. The 1 NO contact closes (changes state to make a circuit).

2. The 1 NC contact opens (changes state to break a circuit).

This simultaneous change in state provides immediate, accurate electrical feedback to the control system, confirming the status of the main contactor for safety interlocking, sequential control, and monitoring purposes.

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