Siemens 3RT2035-3XJ44-0LA2 SIRIUS Power Contactor, S2, 72V DC, 41A, 18.5kW Original Brand New

Overview: Siemens SIRIUS 3RT2035-3XJ44-0LA2 Traction Contactor

The Siemens 3RT2035-3XJ44-0LA2 is a high-performance SIRIUS 3RT2 power contactor specifically designed as a traction contactor for railway applications and other demanding DC-controlled systems. Part of the robust SIRIUS modular system, this size S2 contactor is engineered for switching motors with a rated operational current of 41 A (AC-3e/AC-3) and a power rating of 18.5 kW at $400\text{V}$.

It features a 3-pole main circuit and an advanced solid-state operating mechanism that is coil-controlled by a $72\text{V DC}$ voltage, with a wide control voltage range of 0.7−1.25×Uc​ (rated control voltage). Enhanced protection is provided by an integrated varistor to suppress coil transients.

Key Technical Detail

• Product Type: Traction Contactor
• Series: SIRIUS 3RT2
• Manufacturer Part No.: 3RT2035-3XJ44-0LA2
• Frame Size: S2
• Operational Current (AC-3e/AC-3): $41\text{A}$
• Operational Power: $18.5\text{kW}$ at $400\text{V}$
• Control Voltage: $72\text{V DC}$ (Solid-State)
• Auxiliary Contacts: $2\text{ NO}+2\text{ NC}$ (Removable auxiliary switch)
• Main Circuit Connection: Screw Terminal
• Control & Auxiliary Circuit Connection: Spring-Loaded Terminal

Benefit

• High Reliability for Traction/Rail Applications: Specifically designed and rated for the rigorous demands of railway and similar heavy-duty DC-controlled environments.
• Enhanced Coil Protection: Features an integrated varistor for superior surge suppression, increasing the lifespan of the control circuit and the contactor coil.
• Flexible Connection Types: Offers screw terminals for the high-current main circuit and secure, vibration-resistant spring-loaded terminals for the control and auxiliary circuits.
• Space-Saving Design (S2): Compact size S2 ensures efficient use of panel space while handling significant power loads.
• Extended Mechanical Service Life: Built for longevity with a typical mechanical service life of 10 million operating cycles.
• Integrated Auxiliary Contacts: Comes standard with $2\text{ NO}+2\text{ NC}$ auxiliary contacts in a removable auxiliary switch block for easy wiring and diagnostics.

Function

The Siemens 3RT2035-3XJ44-0LA2 functions as an electromechanical switching device used for the remote control and operation of electric motors and other loads in three-phase AC systems (AC-3, AC-3e). It is essential for direct-on-line (DOL) starting and reversing functions, particularly within the railway industry. The $72\text{V DC}$ signal applied to the solid-state operating mechanism energizes the coil, closing the 3-pole main contacts to supply power to the motor/load.

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