Siemens 3RT2018-2XF42-2LA2 SIRIUS Power Contactor, 16A, 7.5kW, 3-Pole, DC 72-125V Traction Contactor, Size S00 Original Brand New

Overview

The Siemens 3RT2018-2XF42-2LA2 is a high-performance SIRIUS Power Contactor specifically designed as a traction contactor for demanding applications, often within railway or high-vibration environments. This 3-pole contactor is rated for AC-3e/AC-3 switching duty up to 16 A and a motor power of 7.5 kW at 400 V. Its compact frame size S00 and innovative design, featuring a solid-state operating mechanism and integrated varistor, make it ideal for reliable, space-saving installations. The unit is equipped with spring-loaded terminals for fast, vibration-proof wiring.

Technical Specification

• Product ID: 3RT2018-2XF42-2LA2
• Brand: Siemens
• Series: SIRIUS 3RT2
• Contactor Type: Traction Contactor (AC-3e/AC-3)
• Poles: 3-pole
• Operational Current (Ie): 16 A
• Operational Power (Pe): 7.5 kW at 400 V
• Control Voltage (Uc): 72-125 V DC (Wide operating range: 0.7-1.25* Uc)
• Coil Mechanism: Solid-State Operating Mechanism
• Surge Protection: Integrated Varistor
• Auxiliary Contacts: 1 NC (Normally Closed)
• Terminal Type: Spring-Loaded Terminal
• Frame Size: S00
• Mounting: Suspended Mounting Position (optimized for specific installations)

Benefit

1. High Reliability for Harsh Environments: Designed as a traction contactor, it offers robust performance and high mechanical durability, making it perfect for applications with frequent vibrations or shocks, such as in rail and specialized vehicles.
2. Simplified Wiring: The spring-loaded terminals ensure a secure, maintenance-free connection, significantly reducing installation time and providing high resistance to vibration compared to screw terminals.
3. Enhanced System Protection: The integrated varistor provides crucial surge suppression for the coil, protecting the control electronics (like PLCs) from voltage spikes and ensuring a long service life for the contactor.
4. Flexible DC Control: The wide 72-125 V DC control voltage range (0.7-1.25* Uc) accommodates fluctuations common in DC power supplies, increasing operational stability.
5. Space-Saving Design: The compact S00 frame size allows for high-density control cabinet design without compromising performance.

Function & Application

The 3RT2018-2XF42-2LA2 functions as a primary switching device for electrical loads, most commonly for controlling the start, stop, and reversing of three-phase motors.

• Primary Function: Switching motors up to 7.5 kW (400V).
• Key Application Industries:
  • Rail and Transportation: Switching auxiliary circuits in trains, trams, and electric buses.
  • Industrial Automation: High-reliability switching in control panels.
  • DC Control Systems: Applications requiring robust switching with a wide DC control voltage tolerance.

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