Siemens 3RT1926-2FJ11 SIRIUS Solid-State Time-Delayed Front-Side Auxiliary Switch, 24V AC/DC Original Brand New

Overview

The Siemens 3RT1926-2FJ11 is a high-performance solid-state time-delayed front-side auxiliary switch from the SIRIUS industrial control range. Designed specifically as an accessory for the Siemens 3RT1 contactor series (Sizes S0 up to S12), this module easily snaps onto the front of the contactor, saving space and simplifying wiring.

It provides an OFF-delay function without the need for an external control signal, ensuring reliable timing control in critical automation processes. Its wide operating voltage of 24V AC/DC offers great flexibility.

Key Technical Specification

• Product Number: 3RT1926-2FJ11
• Product Brand Name: SIRIUS
• Contactor Compatibility: For 3RT1 Contactors, Size S0 to S12
• Delay Type: OFF-Delay (Without control signal)
• Time Range: Adjustable from 0.05 to 1 second
• Control Supply Voltage: 24V AC/DC
• Auxiliary Contacts: 1 Normally Open (1 NO) + 1 Normally Closed (1 NC)
• Mounting: Front-side snap-on to contactor
• Connection Type: Screw terminals
• Protection Rating: IP20 (on the front)

Function & Operating Principle

This device operates on a solid-state (electronic) principle, providing accurate and repeatable timing.

• OFF-Delay (De-energization Delay): The auxiliary switch contacts (1 NO and 1 NC) change state only after a set time (0.05 to 1 second) has elapsed from the moment the main contactor’s coil is de-energized. This function is vital for applications requiring a brief hold-off or sequential shut-down of components, such as a fan running briefly after the motor stops to provide cooling.
• Front-Side Mounting: Its snap-on design allows for tool-free, direct mounting to the face of the compatible 3RT1 contactor, providing immediate integration into the control circuit.
• Timing Adjustment: The exact delay time within the 0.05-1s range is easily set via a screw slot on the unit.

Benefit

1. High Reliability: Solid-state technology ensures high repeat accuracy ($\pm 1\%$) and a long mechanical service life (10 million operating cycles).
2. Space and Wiring Efficiency: Integrates directly onto the contactor’s front, eliminating the need for a separate DIN-rail-mounted timing relay and reducing complex wiring.
3. Flexible Power: Universal 24V AC/DC control supply voltage simplifies inventory and application across different systems.
4. Optimized for Automation: Ideal for time-critical industrial automation applications requiring precise off-delay sequencing.
5. SIRIUS Quality: Backed by Siemens’ globally recognized SIRIUS industrial control product family.

Application

The 3RT1926-2FJ11 is perfectly suited for use in machinery and electrical panels where a delayed switch-off is necessary:

• Sequential machine shut-down processes.
• Delayed signaling or interlocking.
• Controlling cooling fans or brake systems that need to remain active for a short period after the main load is disconnected.
• Integration into various industrial motor control and process automation systems using Siemens 3RT1 contactors.

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