Siemens 3RT2035-1KB44 SIRIUS Power Contactor, S2, 41A, 24V DC Original Brand New

Overview

The Siemens 3RT2035-1KB44 is a robust and highly efficient 3-pole power contactor from the industry-leading SIRIUS 3RT2 series, designed for switching motors and general resistive loads up to 41 Amperes (AC-3e/AC-3) and 18.5 kW at 400 V.

This size S2 contactor features a low-power 24 V DC operating coil with an integrated varistor for surge suppression, ensuring reliable and long-lasting performance, particularly when controlled by sensitive electronics like PLC outputs. Its compact design and high contact reliability make it an essential component in modern industrial motor control applications.

Key Specification

• Product ID: 3RT2035-1KB44
• Brand: Siemens SIRIUS
• Type: Power Contactor (Coupling Contactor)
• Frame Size: S2
• Poles: 3-pole
• Rated Current (AC-3e/AC-3): 41 A
• Rated Power (400 V): 18.5 kW
• Control Voltage: 24 V DC (Operating range 0.8-1.2* Uc)
• Auxiliary Contacts: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Terminal Type: Screw Terminal
• Surge Suppression: Integrated Varistor
• Special Feature: Suitable for PLC outputs (low-consumption coil) and includes a removable auxiliary switch block.

Benefit

• Reliable PLC Integration: The 24V DC coil with integrated varistor and specific design allows for direct control by sensitive PLC outputs, minimizing electromagnetic interference and simplifying the control circuit.
• High Performance in a Compact Size: Rated for 41A and 18.5 kW, this S2 contactor provides high-power switching capability without requiring excessive panel space.
• Enhanced Durability: The integrated varistor provides superior surge suppression, significantly extending the life of the contactor coil and providing reliable operation.
• Flexible Wiring: Features reliable screw terminals for the main and auxiliary circuits.
• Modular & Expandable: Part of the modular SIRIUS system, allowing for easy combination with other SIRIUS components like overload relays and auxiliary switch blocks.

Function

The Siemens 3RT2035-1KB44 functions as a primary switching device for connecting and disconnecting three-phase electric motors, heaters, and other industrial loads. It is operated by applying the 24V DC control voltage to the coil, which closes the main 3-pole contacts (3 NO) and simultaneously changes the state of the integrated 2 NO + 2 NC auxiliary contacts for use in control, signaling, and interlocking circuits.

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