Siemens SIRIUS 3RT2025-2XF40-0LA2 Traction Contactor, 17A, 7.5kW, 110V DC Coil for Railway Application Original Brand New

Overview: Siemens 3RT2025-2XF40-0LA2 SIRIUS Traction Contactor

The Siemens 3RT2025-2XF40-0LA2 is a robust, high-performance SIRIUS 3RT2 traction contactor specifically engineered for demanding environments, such as railway applications and other systems requiring superior vibration and temperature resistance. This 3-pole power contactor is rated for $17\text{ A}$ (AC-3e/AC-3) and $7.5\text{ kW}$ at $400\text{ V}$, making it ideal for switching motors under extreme operating conditions.

Featuring a reliable solid-state operating mechanism and a wide $110\text{ V DC}$ control voltage range ($\text{0.7-1.25*}\text{Uc}$), the unit ensures consistent, maintenance-free operation. The integrated varistor provides essential overvoltage damping for the coil, further enhancing its reliability and lifespan.

Benefit

• Extreme Reliability: Certified for railway applications, ensuring superior resistance to mechanical oscillations and an extended operating temperature range ($\text{-40}$ to +70 ∘C).
• Maintenance-Free Connection: The spring-loaded terminal technology provides a secure, vibration-resistant connection, drastically reducing maintenance time and ensuring long-term operational integrity.
• Stable Switching Performance: The solid-state operating mechanism coupled with the wide voltage range ($\text{0.7-1.25*}\text{Uc}$) guarantees reliable contactor operation even during significant power supply variations.
• Design & Installation Efficiency: Integrated auxiliary switches ($\text{1 NO}+\text{1 NC}$) and varistor simplify wiring and reduce the need for external components, saving panel space and installation time.

Function

The Siemens 3RT2025-2XF40-0LA2 functions as a main power contactor to reliably switch $3$-phase motors, particularly in railway rolling stock or other heavy-duty industrial mobile equipment. It is designed for applications in compliance with $\text{AC-3e/AC-3}$ utilization categories for switching motors under load, providing high contact reliability and long electrical life. The $110\text{ V DC}$ solid-state drive controls the main power flow based on signals from the automation system, while the integrated auxiliary contacts enable signaling and interlocking functions within the control circuit.

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