Siemens 3RH2911-1FB22 Auxiliary Switch Front Mount, 2NO + 2NC, Screw Terminal for 3RT2/3RH2 Contactors Original Brand New

Overview

The Siemens 3RH2911-1FB22 is a high-performance, front-mounting auxiliary switch designed to expand the functionality of Siemens 3RT2 power contactors and 3RH2 contactor relays. This essential component provides additional switching contacts for control circuits, enabling enhanced monitoring, signaling, and interlocking functions in industrial automation and control systems. Its robust design and reliable screw terminals ensure a secure and long-lasting connection, making it an ideal choice for a wide range of applications.

Key Features & Benefit

• Expanded Functionality: Adds two normally open (2 NO) and two normally closed (2 NC) contacts to your contactor, allowing for complex control and signaling circuits.
• Sequential Switching: Features one normally closed (1 NC) lagging contact and one normally open (1 NO) leading contact. This “make-before-break” and “break-before-make” functionality is crucial for specific interlocking and control sequences, ensuring proper operation and preventing short circuits.
• Easy Front Mounting: Designed for quick and secure installation directly on the front of 3RT2 contactors and 3RH2 contactor relays, saving space and simplifying wiring.
• Reliable Screw Terminals: The durable screw terminals provide a strong, vibration-resistant connection, ensuring the integrity of your control circuit even in demanding industrial environments.
• High-Quality Siemens Engineering: Manufactured with the renowned quality and reliability of Siemens, a global leader in industrial automation. This product is built to last and perform consistently.
• Versatile Application: Perfect for a variety of industrial uses, including motor control, lighting systems, HVAC, and machinery automation where additional control contacts are required.

Technical Specification

• Product Number: 3RH2911-1FB22
• Type: Auxiliary Switch
• Mounting: Front Mount
• Contact Configuration: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Current Path: 1 NO, 1 NC, 1 NC (lagging), 1 NO (leading)
• Terminals: Screw Terminals
• Compatibility: Designed for use with Siemens 3RT2 Power Contactors and 3RH2 Contactor Relays.

Function

The Siemens 3RH2911-1FB22 auxiliary switch acts as a control extension for contactors. When the main contactor is energized, this auxiliary switch changes the state of its four contacts. The specific “lagging” and “leading” contacts ensure that a specific circuit is either closed before another or opened after another, a critical function for safety and sequential operations in complex systems. The screw terminals allow for easy connection of control wires, enabling signals to be sent to PLCs, indicator lights, or other control devices based on the state of the main contactor.

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