Siemens 3RT1926‑2FK11 Time‑Delayed Solid‑State Auxiliary Switch 0.05‑1s, 100‑127V AC/DC Original Brand New

Overview

The Siemens 3RT1926‑2FK11 is a high‑performance solid‑state, time‑delayed auxiliary switch designed for seamless integration with Siemens SIRIUS contactors (3RT1 series). With a finely adjustable OFF‑delay range of 0.05 to 1 second, and compatibility with nominal control voltages from 100 to 127 V AC/DC, this unit offers precision timing, robust performance and compact installation.

Built for industrial environments, this front‑side mountable auxiliary switch features 1 normally open (NO) contact and 1 normally closed (NC) contact, enabling versatile switching logic for control circuits. The absence of a separate control signal simplifies wiring and system architecture, making it an ideal solution for automation systems requiring delayed off functions without external triggers.

Key Benefit

• Precise timing control – adjustable delay from 0.05 s to 1 s ensures fine‑tuned OFF‑delay switching.

• Wide voltage compatibility – supports 100‑127 V AC or DC control voltage, enabling flexible global use.

• Compact and efficient – front‑side mount design saves panel space and simplifies retrofits.

• Dual contact configuration – includes both NO and NC contacts (1 each) for versatile control logic.

• Reliable industrial build – designed for long operational life (mechanical life up to 10 million cycles) and harsh environments.

• Seamless integration – specifically designed for use with Siemens 3RT1‑series contactors, streamlining system design and compatibility.

Function & Application

• OFF‑delay function: Upon the supply to the auxiliary switch being removed, the switch continues operation for the preset delay time (0.05 to 1 s) before opening/closing its contacts. Ideal for controlling circuits that require a controlled shutdown sequence.

• Front‑side mounting: Attaches directly to the front of compatible contactors (sizes S0–S12) for quick installation and minimal wiring.

• Control voltage independent of coil signal: The unit does not require a separate control signal for operation, simplifying control logic and wiring.

• Dual‑contact logic: Employ the NO contact for delayed ‘make’ events and the NC contact for delayed ‘break’ events, or implement combined logic in your control panel.

• Industrial duty rating: With a nominal rated control voltage range and high mechanical endurance, this auxiliary switch is built for repeated industrial use in automation, motor control, and timed sequence applications.

application

• Motor control circuits where a delay is needed after the main contactor opens.

• Automation sequences requiring a brief hold‑off time before de‑energising downstream circuits.

• Retrofit upgrades on existing Siemens SIRIUS contactor assemblies to add timed functionality.

• Panel‑mounted auxiliary switching in distribution boards, machine control centres or process automation cabinets.

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