Siemens 3RT2028-2XB40-0LA2 SIRIUS Traction Contactor, 38A, 24V DC, S0 Original Brand New

Overview: High-Performance Siemens SIRIUS 3RT2 Traction Contactor

The Siemens 3RT2028-2XB40-0LA2 is a robust and reliable SIRIUS 3RT2 traction contactor specifically engineered for demanding applications, such as railway and extreme industrial environments. Part of the SIRIUS modular system, this 3-pole contactor is designed for switching motors (AC-3e/AC-3) and non-inductive loads under elevated stress conditions.

Featuring a solid-state operating mechanism and an integrated varistor for coil overvoltage protection, the 3RT2028-2XB40-0LA2 ensures high reliability, extended lifespan, and superior performance within a wide temperature range (typically −40∘C to +70∘C). Its compact Size S0 design and spring-loaded terminals allow for fast, vibration-proof, and maintenance-free wiring, making it an excellent choice for critical low-voltage industrial control systems.

Benefit

• Reliability in Extreme Conditions: Meets standards for railway applications (IEC 60077-2, EN 50155) with an extended operating and temperature range (e.g., −40∘C to +70∘C).
• Enhanced Coil Protection: The integrated varistor provides crucial surge protection, extending the life of the control circuit and contactor.
• Vibration-Resistant Wiring: Spring-loaded terminals ensure a reliable, maintenance-free, and secure connection, essential for moving or vibration-prone equipment.
• High Performance: Capable of switching motor loads up to 18.5 kW at 400 V with a rated current of 38 A.
• Simple Integration: Standardized auxiliary contacts ($1\text{ NO}+1\text{ NC}$) are included in the base unit for easy signaling and interlocking.

Function

The 3RT2028-2XB40-0LA2 functions as an electrically controlled switch designed for making and breaking high-current motor and resistive loads. The low-power 24V DC solid-state coil controls the main power poles, offering a wide operating voltage tolerance. Its specific “traction contactor” designation highlights its suitability for environments demanding increased resistance to mechanical stress, wide temperature fluctuations, and extended coil operating ranges, making it ideal for traction and mobile control systems.

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