Siemens SIRIUS 3RT2025-2XF40-1LA2 Traction Contactor, 17A, 7.5kW/400V, 110V DC, Spring-Loaded Terminal, Size S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2025-2XF40-1LA2 is a high-performance traction contactor from the SIRIUS 3RT2 series, specifically engineered for demanding DC applications, such as railway and transport systems. This compact, 3-pole contactor in Size S0 is rated for switching motors up to 17 A (AC-3e/AC-3) and 7.5 kW at 400 V. It features an advanced 110 V DC solid-state operating mechanism that ensures reliable, low-power operation across a wide voltage range (0.7-1.25×Uc​) and includes an integrated varistor for superior surge suppression and coil protection.

Key Technical Specification

• Product Type: Traction Contactor
• Article Number: 3RT2025-2XF40-1LA2
• Manufacturer: Siemens
• Series: SIRIUS 3RT2
• Size: S0
• Poles: 3-pole
• Rated Operational Current (AC-3e/AC-3): $17\text{ A}$
• Rated Power: $7.5\text{ kW}/400\text{ V}$
• Control Voltage: $110\text{ V DC}$
• Coil Type: Solid-state operating mechanism with extended operating range (0.7-1.25×Uc​)
• Surge Suppression: Integrated Varistor
• Auxiliary Contacts: $1\text{ NO}+1\text{ NC}$
• Terminal Type: Spring-loaded terminal (fast and vibration-proof wiring)
• Mounting Position: Upright

Benefits and Features

1. High Reliability for Traction/DC Loads: Specifically designed as a traction contactor, offering robust performance and reliability in environments subject to vibration and demanding DC switching cycles.
2. Solid-State Coil Technology: The 110 V DC solid-state operating mechanism provides a wide operating voltage tolerance (0.7-1.25×Uc​), ensuring stable and low-power operation even with voltage fluctuations common in traction applications.
3. Integrated Protection: The built-in varistor eliminates the need for external surge suppressors, protecting the coil and extending the life of the entire control circuit.
4. Quick and Secure Wiring: Spring-loaded terminals allow for fast, tool-free wiring and maintain a permanent, vibration-proof connection, reducing maintenance time and costs.
5. Compact, Space-Saving Design: Size S0 form factor allows for high-density panel mounting, making the most of limited control cabinet space.

Function

The Siemens 3RT2025-2XF40-1LA2 serves as a power contactor for switching 3-phase AC motors and other loads, particularly in DC-controlled systems like railway vehicles and industrial machinery where DC control voltage (110 V DC) and reliable operation under variable conditions are critical. Its main function is to reliably and repeatedly establish and interrupt the power circuit for motors up to $7.5\text{ kW}$ while providing auxiliary switching functions via the integrated $1\text{ NO}+1\text{ NC}$ contacts for signaling and interlocking circuits.

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