Siemens 3RH2911-1GA04 Auxiliary Switch 4 NC Contacts, Screw Terminal Original Brand New

Overview

The Siemens 3RH2911-1GA04 is a high-quality, front-mounted auxiliary switch designed to expand the contact capabilities of specific Siemens contactor relays. Engineered for reliable performance in industrial control applications, this unit provides four normally closed (4 NC) contacts, ensuring crucial signaling and interlocking functions.

Its screw terminal connections facilitate a secure and straightforward installation, while the physical coding ensures correct and safe integration. This auxiliary switch is a vital component for enhancing the functionality and safety of your control circuits.

Key Benefit

• Expanded Control: Adds four normally closed contacts to your system, allowing for more complex control logic and signaling.
• Enhanced Safety: The physically coded design ensures correct assembly, preventing errors and improving system reliability.
• Secure Connections: Robust screw terminals provide a durable and vibration-resistant connection, reducing the risk of wiring faults.
• Seamless Integration: Specifically designed for use with Siemens 3RH2140 and 3RH2440 contactor relays, guaranteeing perfect fit and function.
• Reliable Performance: Manufactured by Siemens, a global leader in industrial automation, ensuring long-term durability and consistent operation.

Technical Specification & Features

• Product Number: 3RH2911-1GA04
• Type: Auxiliary Switch
• Mounting: Front-mounted
• Number of Contacts: 4 NC (Normally Closed)
• Terminal Designations: 51/52, 61/62, 71/72, 81/82
• Current Path Configuration: 1 NC, 1 NC, 1 NC, 1 NC
• Connection Type: Screw Terminal
• Compatibility: Exclusively compatible with Siemens contactor relays 3RH2140 and 3RH2440 (as per EN 50011).
• Key Feature: Physically coded for correct mounting.

Function

The Siemens 3RH2911-1GA04 auxiliary switch is a crucial component in control systems where additional contacts are needed to monitor the status of a contactor relay. When the main contactor is de-energized, its contacts are in their normally closed (NC) state, allowing current to flow. As the contactor is energized, these NC contacts open, interrupting the circuit. This action is used for various control functions, such as:

• Interlocking: Preventing a conflicting operation by ensuring a second device cannot be activated while the first is running.
• Signaling: Providing a signal to a PLC, indicator light, or alarm system about the state of the main contactor.
• Feedback Loops: Used in automation systems to confirm an action has been completed.

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