Siemens 3RH2911-1FA22 Front-Mount Auxiliary Switch, 2 NO + 2 NC, Screw Terminals for 3RT2 & 3RH2 Original Brand New

Overview

The Siemens 3RH2911-1FA22 is a highly reliable and essential front-mounted auxiliary switch designed to expand the functionality of Siemens 3RT2 contactors and 3RH2 contactor relays. This compact and robust unit provides an additional four contacts (2 Normally Open and 2 Normally Closed) for signaling, control, and feedback applications within industrial automation systems.

Engineered for seamless integration, the 3RH2911-1FA22 auxiliary switch features a simple, tool-free snap-on mounting mechanism on the front of the main device, ensuring quick and secure installation. The dependable screw terminals provide a strong, stable connection, making it an ideal choice for a wide range of industrial control circuits.

Key Features

• Front-Mounting Design: Installs directly on the front of compatible contactors and relays, saving panel space and simplifying wiring.
• Contact Configuration: Provides a versatile 2 NO (Normally Open) and 2 NC (Normally Closed) contact arrangement.
• Screw Terminals: Ensures a secure and reliable electrical connection, suitable for demanding industrial environments.
• Current Path Logic: Features a specific contact sequence: 1 NO, 1 NC, 1 NC, 1 NO.
• High Compatibility: Specifically designed for perfect compatibility with Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays.
• Durable Construction: Built with high-quality materials to withstand vibrations and environmental stressors, ensuring a long operational life.

Technical Specification

• Product Number: 3RH2911-1FA22
• Contact Type: Front-mount auxiliary switch
• Contact Configuration: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Connection Type: Screw terminals
• Compatibility: Siemens 3RT2 Contactors and Siemens 3RH2 Contactor Relays
• Mounting Position: Front
• Current Path: 1 NO, 1 NC, 1 NC, 1 NO

Benefit

• Enhanced Control & Signaling: Adds crucial feedback and signaling contacts to your control circuits without requiring additional space or complex wiring.
• Space-Saving Design: Its front-mounting feature helps to optimize panel layout and reduce the overall footprint of your electrical cabinet.
• Simplified Installation: The easy snap-on mounting and clearly marked screw terminals reduce installation time and potential for wiring errors.
• Reliable Performance: As a genuine Siemens component, it guarantees the high quality, durability, and performance expected in critical industrial applications.

Function

The Siemens 3RH2911-1FA22 auxiliary switch serves as a critical component in electrical control systems. When the main contactor or contactor relay is activated, the auxiliary contacts change state, providing a signal that can be used for:

• Status Indication: Illuminating a pilot light to show that a motor is running.
• Interlocking: Preventing other contactors from energizing simultaneously to ensure safe operation.
• Feedback: Providing a signal to a PLC (Programmable Logic Controller) or other control system, confirming the state of the main device.
• Control Logic: Building complex control sequences by using the auxiliary contacts to enable or disable other parts of the circuit.

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