Siemens 3RT2028-2XL40-0LA2 Contactor, 38A, 36V DC, S0, Spring-Loaded Original Brand New

Overview: Siemens SIRIUS 3RT2028-2XL40-0LA2 Traction Contactor

The Siemens 3RT2028-2XL40-0LA2 is a high-performance 3-pole traction contactor from the SIRIUS family, designed for demanding switching applications, particularly in railway and heavy-duty industrial environments. This specific model features an extended operating range and a highly reliable solid-state operating mechanism (electronic drive) to ensure precise and durable switching under challenging conditions. It is rated for $38\text{ A}$ (AC-3e/AC-3) and a power of $18.5\text{ kW}$ at $400\text{ V}$.

A key feature is the wide voltage range (0.7–1.25×Uc​) $36\text{ V DC}$ control coil, which is ideal for systems with fluctuating control voltage. The unit is designed with compact Frame Size S0 and utilizes spring-loaded terminals for fast, reliable, and vibration-proof wiring.

Function & Application

The 3RT2028-2XL40-0LA2 functions as a robust switching device in motor and resistive load circuits. Its “traction contactor” designation highlights its suitability for applications where high reliability and resistance to shock and vibration are crucial, such as in rail vehicles, mining equipment, or heavy machinery. The solid-state mechanism offers a significantly extended service life compared to standard coil mechanisms.

Core Benefits & Features

1. High Reliability for Harsh Environments: Specifically designed as a traction contactor, providing increased robustness against mechanical stress and environmental factors.
2. Wide Control Voltage Range: The $36\text{ V DC}$ solid-state operating mechanism with a 0.7–1.25×Uc​ range ensures reliable switching even with supply voltage fluctuations.
3. Space-Saving Design: Frame Size S0 offers a high power-to-size ratio, optimizing panel space.
4. Integrated Surge Protection: The built-in varistor protects the coil against voltage spikes, increasing the longevity of the control circuit.
5. Fast & Secure Wiring: Spring-loaded terminals provide quick, maintenance-free, and permanent contact, making them resistant to loosening from vibration.
6. Convenient Monitoring: Integrated $1\text{ NO}$ and $1\text{ NC}$ auxiliary contacts allow for easy feedback and interlocking in the control system.

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