Siemens SIRIUS 3RT2035-3XF44-0LA2 Traction Contactor, 41A, 18.5kW, 110V DC Coil, Spring-Loaded Terminals, Size S2 Original Brand New

Overview

The Siemens 3RT2035-3XF44-0LA2 is a high-quality, 3-pole traction contactor from the SIRIUS 3RT2 series, specifically designed for switching motors under demanding conditions, particularly suitable for railway or similar applications requiring robust DC control. It features an advanced solid-state operating mechanism and integrated varistor for reliable surge protection.

Key Specification

• Product Number: 3RT2035-3XF44-0LA2
• Contactor Type: Traction Contactor
• Switching Category: AC-3e/AC-3
• Rated Operational Current (Ie​): 41 A (at 400 V)
• Rated Operational Power (Pe​): 18.5 kW (at 400 V)
• Poles: 3-pole
• Control Supply Voltage (Us​): 110 V DC
• Operating Range (DC Coil): 0.7 to 1.25 * Us​
• Coil Technology: Solid-state operating mechanism with integrated varistor
• Auxiliary Contacts: 2 NO (Normally Open) + 2 NC (Normally Closed), removable auxiliary switch
• Main Circuit Connection: Screw terminal
• Control/Auxiliary Circuit Connection: Spring-loaded terminal
• Frame Size: S2

Benefit

• Enhanced Reliability: Solid-state operating mechanism and integrated varistor provide robust protection against voltage surges, extending the contactor’s lifespan and ensuring dependable operation, especially in DC control systems.
• High Performance: Rated for $41\text{ A}$ and $18.5\text{ kW}$ (at $400\text{ V}$), suitable for heavy-duty motor switching applications (AC-3e/AC-3).
• Flexible Wiring: Combines durable screw terminals for the main power circuit and fast, vibration-proof spring-loaded terminals for control and auxiliary wiring, optimizing installation time and reliability.
• Versatile Auxiliary Contacts: Features $2\text{ NO}+2\text{ NC}$ auxiliary contacts, with a removable auxiliary switch block, allowing for flexible control and signaling integration.
• Wide Voltage Tolerance: The $110\text{ V DC}$ coil operates reliably within a broad range (0.7-1.25⋅Us​), accommodating voltage fluctuations common in industrial and traction environments.

Function

The Siemens 3RT2035-3XF44-0LA2 functions as a robust electromagnetic switch (contactor) designed to safely and efficiently control the current flow to a motor. When the $110\text{ V DC}$ control voltage is applied to the solid-state coil, the main contacts close, connecting the $400\text{ V},18.5\text{ kW}$ load to the power supply. The traction contactor classification indicates its design for applications with high mechanical and electrical demands, like those found in transportation systems.

Application

• Railway and transportation systems (traction)
• Motor control for demanding industrial machinery
• Switching loads in DC control environments
• Pump, fan, and conveyor systems
• Any application requiring a robust $41\text{ A},3$-pole contactor with DC coil and spring-loaded control terminals.

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