Siemens 3RH1921-1KA02 Auxiliary Switch Block 2 NC Contacts for 3RT1 Contactors Original Brand New

Overview

The Siemens 3RH1921-1KA02 is a high-quality, lateral auxiliary switch block designed to enhance the functionality of Siemens 3RT1 contactors. It provides two normally closed (NC) auxiliary contacts, crucial for control circuits and signaling applications. This unit is compliant with EN 50005 standards, ensuring reliable and safe operation in industrial environments. Its compact design and simple screw terminal connection make it an ideal addition for expanding the control capabilities of your existing Siemens contactor systems.

Key Features & Benefit

• Expanded Functionality: Adds two dedicated Normally Closed (NC) contacts, allowing for increased flexibility in your control and monitoring circuits. This is essential for applications requiring status feedback or interlocking.
• Seamless Integration: Specifically designed for easy, lateral mounting on Siemens 3RT1 contactors. The “second lateral” design allows for stacking and configuration with other auxiliary blocks.
• Reliable Performance: Adheres to the strict EN 50005 standard, guaranteeing consistent and dependable electrical performance. The robust construction ensures long-term durability in demanding industrial settings.
• Easy Installation: Features user-friendly screw terminals for secure and straightforward wiring. This reduces installation time and simplifies maintenance.
• Space-Saving Design: With a 10 mm width, this auxiliary switch block minimizes the space required on your DIN rail, helping you to optimize cabinet layouts and save valuable panel real estate.

Function

The Siemens 3RH1921-1KA02 auxiliary switch block functions as a critical component in automation and control systems. When mounted on a 3RT1 contactor, the state of the auxiliary contacts changes in tandem with the contactor’s main contacts. The two NC contacts are closed when the contactor is de-energized and open when the contactor is energized. This synchronized operation is utilized for a variety of functions, including:

• Interlocking: Preventing a second device from operating until the first one is properly de-energized.
• Signaling: Providing a signal to PLCs, control relays, or indicator lights to show the status (on/off) of the contactor.
• Feedback Loops: Used in automation circuits to confirm the contactor has operated correctly before proceeding to the next step.

Technical Specification

• Product Number: 3RH1921-1KA02
• Contact Configuration: 2 NC (Normally Closed)
• Mounting Type: Lateral, on the side
• Compatible Contactors: Siemens 3RT1 series
• Connection Type: Screw terminals
• Standard: EN 50005
• Width: 10 mm

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