Siemens 3RH2911-2FB22 Front Auxiliary Switch with Spring-Loaded Terminals for 3RT2/3RH2 Contactors Original Brand New

Overview

The Siemens 3RH2911-2FB22 is a high-performance front-mounted auxiliary switch engineered to expand the functionality of your Siemens 3RT2 contactors and 3RH2 contactor relays. This compact and reliable module provides a crucial interface for complex control and signaling circuits, ensuring the safe and efficient operation of your industrial equipment. With its 2 normally open (NO) and 2 normally closed (NC) contacts, it offers versatile configuration options for a wide range of applications.

Key Features & Benefit

• Expanded Control Capabilities: This auxiliary switch adds four additional contacts (2 NO + 2 NC) to your contactor or contactor relay, allowing for more intricate control logic and signaling.
• Time-Delayed Switching (Lagging/Leading): The unique current path configuration (1 NO leading, 1 NC lagging) provides a precise sequencing of events, which is critical for safety-related circuits and complex machine operations. The lagging contact ensures a delay in breaking, while the leading contact ensures an early make.
• Quick & Secure Installation: The front-mounting design allows for fast and easy installation without the need for additional tools or complex wiring. It snaps directly onto the contactor, saving time and labor costs.
• Reliable Spring-Loaded Terminals: The integrated spring-loaded terminals provide a vibration-proof and gas-tight connection, ensuring long-term reliability and reducing maintenance. This technology simplifies wiring and eliminates the need for regular screw tightening.
• Seamless Compatibility: Specifically designed for the Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays, this auxiliary switch guarantees perfect mechanical and electrical compatibility.

Function

The Siemens 3RH2911-2FB22 auxiliary switch works in tandem with a main contactor. When the coil of the main contactor is energized, the auxiliary switch's contacts change state simultaneously. The unique configuration of the current path provides specific timing characteristics:

• 1 NO contact (leading): This contact closes slightly before the main contactor's contacts.
• 1 NC contact (lagging): This contact opens slightly after the main contactor's contacts.
• 1 NO contact (.3/.4) & 1 NC contact (.1/.2): These contacts operate in sync with the main contactor.
• 1 NC contact (.5/.6) & 1 NO contact (.7/.8): These are the time-delayed contacts.

This synchronized and time-delayed operation is essential for interlocking circuits, signaling lamp control, and complex machine sequencing.

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