Siemens 3RH1921-1KA11 Auxiliary Switch Block 1 NO, 1 NC, Screw Terminal for 3RT1 Contactors Original Brand New

Overview

The Siemens 3RH1921-1KA11 is a high-quality, second lateral auxiliary switch block designed specifically for use with Siemens 3RT1 series power contactors. This essential accessory provides a reliable and flexible solution for expanding the control and signaling capabilities of your industrial applications.

Featuring a 1 NO (normally open) and 1 NC (normally closed) contact configuration, it offers a robust way to integrate additional control circuits, status feedback, or interlocking functions. The straightforward screw terminal connection ensures a secure and hassle-free installation, making it a perfect addition for both new setups and existing systems.

Key Features & Benefit

• Seamless Integration: Engineered to perfectly fit Siemens 3RT1 contactors, ensuring a secure and reliable connection without any modifications.
• Enhanced Control: Adds a 1 NO and 1 NC auxiliary contact, allowing for expanded control possibilities, such as status signaling, interlocking, and circuit feedback.
• Reliable Performance: Manufactured by Siemens, a global leader in industrial automation, guaranteeing long-lasting performance and compliance with international standards.
• Easy Installation: The classic screw terminal design simplifies wiring, enabling quick and secure connections to your control circuits.
• Space-Saving Design: The lateral mounting position saves valuable space on your DIN rail or inside your control cabinet, maintaining a compact and organized layout.
• Durable Construction: Built with high-quality materials to withstand the rigors of industrial environments, ensuring consistent operation and minimal maintenance.

Function

The Siemens 3RH1921-1KA11 auxiliary switch block functions by mechanically coupling to the main contactor. When the main contactor coil is energized and its main contacts change state (e.g., from open to closed), the auxiliary switch block’s contacts simultaneously change state. The 1 NO (Normally Open) contact closes when the contactor is energized, while the 1 NC (Normally Closed) contact opens. This synchronized action is crucial for various applications, including:

• Status Indication: The NO contact can be wired to a signal lamp or PLC input to indicate that the contactor is “on” or “off.”
• Control Circuit Logic: The NO/NC contacts are used to build complex control logic, such as ensuring one motor cannot start before another has stopped (interlocking).
• Feedback Loops: Providing feedback to a Programmable Logic Controller (PLC) to confirm the state of a motor or other load.

Technical Specification

• Product Number: 3RH1921-1KA11
• Manufacturer: Siemens
• Product Type: Auxiliary Switch Block
• Contact Configuration: 1 Normally Open (NO) + 1 Normally Closed (NC)
• Terminal Type: Screw Terminal
• Mounting Position: Lateral (Side)
• Compatibility: Designed for Siemens 3RT1 series power contactors

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