Siemens 3RH1921-1CA01 Front-Side Auxiliary Switch, 1 NC Contact, Screw Terminal Original Brand New

Overview

The Siemens 3RH1921-1CA01 is a reliable and essential front-side auxiliary switch designed to enhance the functionality and control of Siemens 3RT1 contactors. This compact and easy-to-install module provides a single normally closed (NC) contact, perfect for a wide range of industrial control applications. Its screw terminal connection ensures a secure and robust electrical link, making it a dependable choice for your automation and control systems.

Key Features & Benefit

• Seamless Integration: Specifically designed for effortless front-side mounting on Siemens 3RT1 contactors, saving time and simplifying installation.
• Enhanced Control: Adds a crucial 1 NC auxiliary contact, allowing for additional control and signaling functions in your electrical circuits.
• Reliable Performance: Built with Siemens’ renowned quality and engineering, ensuring long-term durability and consistent performance in demanding industrial environments.
• Secure Connection: The screw terminal design provides a strong, vibration-resistant connection, reducing the risk of intermittent faults.
• Compact Design: Its space-saving form factor ensures it won’t add unnecessary bulk to your control panels.

Function

The Siemens 3RH1921-1CA01 auxiliary switch serves to add an extra control point to a 3RT1 contactor. When the main contactor is de-energized, the 1 NC contact is in its closed state. When the contactor is energized, the auxiliary switch mechanically changes state, and the 1 NC contact opens. This action can be used for various purposes, including:

• Feedback and Status Indication: Signaling the status (open/closed) of the main contactor to PLCs or indicator lights.
• Interlocking Circuits: Creating safety interlocks to prevent simultaneous operation of conflicting equipment.
• Control Logic: Providing an additional signal for complex control sequences.
• Alarm and Signaling: Triggering alarms or other signals when a specific state of the contactor is reached.

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