Siemens 3RT2028-2XF40-0LA2 SIRIUS 3RT2 Traction Contactor, 3-Pole, 38A, 18.5kW, S0 Frame, 110V DC Coil, Spring-Loaded Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT2028-2XF40-0LA2 is a high-performance traction contactor designed for demanding switching applications, such as those found in railway systems and other environments requiring robust operation under extreme conditions. Part of the SIRIUS 3RT2 family with an extended operating range, this 3-pole contactor is optimized for AC-3e/AC-3 switching of motors up to 18.5 kW at 400 V (rated current Ie​ is 38 A).

It features a durable solid-state operating mechanism (electronic drive) and an integrated varistor for surge protection, ensuring high reliability and long service life. The control voltage is 110 V DC with an extended operating range of 0.7−1.25×Uc​. It comes in the compact Size S0 frame.

Key Features & Technical Specifications

• Product Type: Traction Contactor / Power Contactor
• Siemens Family: SIRIUS 3RT2 (with extended application range)
• Article Number (MPN): 3RT2028-2XF40-0LA2
• Poles: 3-pole main circuit
• Rated Operating Current (Ie​): 38 A (at AC-3, 400 V)
• Rated Operational Power: 18.5 kW (at AC-3, 400 V)
• Control Coil Voltage (Us​): 110 V DC
• Control Range: 0.7−1.25×Uc​ (extended)
• Auxiliary Contacts: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Operating Mechanism: Solid-state (Electronic Drive)
• Surge Suppression: Integrated Varistor
• Connection Type: Spring-loaded terminal (fast, maintenance-free, and vibration-proof)
• Frame Size: S0

Benefit

1. High Reliability in Tough Environments: Specifically designed for demanding applications like railway technology, offering an extended operating and temperature range (e.g., $-40$ to $+70\text{°C}$) and robust shock/vibration resistance.
2. Space-Saving & Modular: Compact S0 frame size and part of the modular SIRIUS system, allowing for easy integration and coordination with other components (e.g., overloads, circuit breakers).
3. Enhanced Surge Protection: The integrated varistor provides superior protection for the coil, reducing downtime and extending the lifespan of the control circuit.
4. Vibration-Proof Connection: Spring-loaded terminals ensure a fast, secure, and maintenance-free connection, critical for mobile and high-vibration applications.
5. Global Compliance: Climate-resistant and approved for worldwide use (e.g., IEC and UL/CSA). IE3/IE4-ready for energy-efficient motor switching.

Function / Application

The Siemens 3RT2028-2XF40-0LA2 functions as a power contactor for the reliable switching of motors and other loads, particularly in:

• Railway applications (traction systems, on-board power)
• Heavy industry where high vibration or temperature fluctuations are present
• Machinery requiring a 110 V DC control circuit
• Any system requiring robust, compact 3-pole switching up to 38 A / 18.5 kW.

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