Siemens SIRIUS 3RT2026-1XF40-0LA2 Traction Contactor, 25A, 11kW, 110V DC Coil, S0, Screw Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT2026-1XF40-0LA2 is a high-performance, 3-pole traction contactor from the globally recognized SIRIUS modular system. Specifically engineered for demanding applications, particularly in the railway or heavy-duty motor control sector, this Size S0 contactor offers reliable switching capabilities for motors up to 11 kW at 400 V (AC-3e/AC-3 utilization category).

Featuring a robust solid-state operating mechanism and a DC control coil, it is designed for a wide control voltage range of 0.7−1.25×Uc​ (110 V DC nominal) for enhanced flexibility and system stability. The integrated varistor provides essential surge suppression, protecting the coil and extending the contactor’s service life. Its straightforward screw terminals ensure secure and quick wiring for both the main and auxiliary circuits.

Benefits & Features

• Reliable Traction Application: Specifically designed as a traction contactor, making it ideal for the stringent requirements of railway, transportation, and other harsh DC control environments.
• High Performance: Rated for 25 A (AC-3e/AC-3) and 11 kW motor switching at 400V, providing robust performance for industrial motors.
• Enhanced Coil Protection: Features an integrated varistor to damp switching surges, significantly improving the coil’s lifespan and system reliability.
• Wide Control Voltage Range: The solid-state operating mechanism ensures reliable pickup and holding across a broad control voltage window (0.7−1.25×Uc​), crucial for stable operation in fluctuating supply conditions (e.g., railway applications).
• Integrated Auxiliary Contacts: The built-in $1\text{ NO}+1\text{ NC}$ auxiliary contacts provide immediate feedback and control signals without the need for additional, bulky side-mounted blocks.
• Compact & Modular: Part of the Siemens SIRIUS 3RT2 family (Size S0), ensuring a space-saving design and easy integration within the SIRIUS modular control system.
• Secure Connection: Reliable screw terminal connection method for durable, vibration-proof main and control circuit wiring.

Function

The Siemens 3RT2026-1XF40-0LA2 functions as an electromechanical switching device used to control the flow of electrical power to an electric motor or another high-power load. It is primarily used for the safe and reliable switching of 3-phase motors (AC-3e/AC-3).

The $110\text{ V DC}$ control voltage, applied to the solid-state coil, energizes the main contacts, allowing the operational current (25 A) to flow to the load. The integrated auxiliary contacts mirror the state of the main contacts, providing crucial signaling for interlocking or control system logic.

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