Siemens 3RH7921-1FA22 Auxiliary Switch Block 2 NO + 2 NC, 4-Pole, for S0-S3 Contactors, Screw Terminal Original Brand New

Overview

The Siemens 3RH7921-1FA22 is a high-quality, 4-pole auxiliary switch block designed to expand the functionality of Siemens SIRIUS 3RT series motor contactors. This versatile component provides additional switching contacts, making it an essential tool for creating complex control circuits, interlocking systems, and status feedback loops. With its robust construction and screw terminals, the 3RH7921-1FA22 offers a reliable and secure connection, ensuring optimal performance in demanding industrial environments.

Key Features & Benefit

• Expanded Control Options: The 2 normally open (NO) and 2 normally closed (NC) contacts allow for flexible circuit design, enabling complex control logic and interlocking schemes.
• Broad Compatibility: Specifically engineered for use with Siemens 3RT contactors ranging from size S0 to S3, ensuring a perfect fit and seamless integration.
• Reliable Performance: Built to Siemens’ high-quality standards, this auxiliary switch guarantees long-term durability and consistent, reliable switching operations.
• Easy Installation: The simple snap-on design allows for quick and effortless mounting onto the front of the contactor, reducing installation time and effort.
• Secure Connection: Equipped with secure screw terminals, the switch block ensures a strong, vibration-resistant electrical connection, minimizing the risk of faults.
• Space-Efficient Design: Its compact form factor adds functionality without significantly increasing the overall footprint of your control panel.

Function

• Status Indication: The NO/NC contacts can be used to signal the ON/OFF status of the main contactor to PLCs, indicator lights, or other control devices.
• Interlocking: Crucial for safety and sequence control, this switch block can be used to interlock multiple contactors or other components, preventing conflicting operations.
• Auxiliary Circuits: Provides additional contacts for activating auxiliary circuits, such as timing relays, signaling devices, or other components that need to be synchronized with the main contactor’s operation.

Technical Specification

• Product Number: 3RH7921-1FA22
• Manufacturer: Siemens
• Type: Auxiliary Switch Block
• Number of Poles: 4
• Contact Configuration: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Connection Type: Screw Terminals
• Compatibility: For use with Siemens 3RT contactors, sizes S0, S1, S2, and S3.
• Mounting: Front-mounted, snap-on
• Series: SIRIUS

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