Siemens 3RT1926-2FJ21 SIRIUS Solid-State OFF-Delay Auxiliary Switch Block for 3RT1 Contactors, 0.5-10s, 24V AC/DC Original Brand New

Overview

The Siemens 3RT1926-2FJ21 SIRIUS is a high-performance, solid-state time-delayed auxiliary switch block designed for seamless front-side mounting onto the SIRIUS 3RT1 series contactors (sizes S0 to S12). This essential control gear accessory provides a crucial OFF-delay timing function without requiring an external control signal, making it perfect for applications that need a controlled, delayed shutdown or transition. It utilizes solid-state electronic technology for highly reliable and precise timing within the adjustable range of 0.5 to 10 seconds.

Benefits & Advantages

• Precision Timing: Solid-state electronic technology ensures high accuracy and repeatability for critical timing in automation processes.
• Space & Time Saving: Convenient front-side mounting directly onto 3RT1 contactors eliminates the need for separate installation hardware and saves valuable panel space.
• Enhanced Control: Provides a reliable OFF-delay function, ensuring motors or loads continue operation for a set time after the main contactor is de-energized (e.g., cooling fans, conveyor stops).
• Broad Compatibility: Compatible with a wide range of Siemens 3RT1 contactor sizes (S0 up to S12), offering flexible use across various industrial applications.
• Reliable Operation: Built with the quality and robustness of the Siemens SIRIUS control gear family.

Function & Application

This device functions as a timer block that provides a delayed switching action to its auxiliary contacts.

• Function: Upon the de-energization of the host 3RT1 contactor coil (the “OFF” state), the auxiliary switch contacts maintain their initial state for the adjustable time duration ($0.5\text{ s}\dots 10\text{ s}$). After the delay, the $1\text{ NO}$ contact opens, and the $1\text{ NC}$ contact closes.
• Typical Applications: Used in industrial automation and motor control circuits for:
  • Delayed stopping of fans or pumps.
  • Controlled sequence switching in complex machinery.
  • Time-delayed interlocking circuits for safety or process requirements.

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