Siemens SIRIUS 3RT2045-3XF40-0LA2 Contactor 80 A, 37 kW, 110 V DC, S3 Frame, Traction & General Use Original Brand New

Overview

The Siemens SIRIUS 3RT2045-3XF40-0LA2 is a high-performance 3-pole traction contactor from the SIRIUS modular system, designed for reliable switching of motors and other loads up to 80 A. With a 37 kW power rating at 400 V, it’s suitable for a wide range of industrial applications, particularly in demanding environments like traction systems. Its robust S3 frame size and integrated varistor provide enhanced surge protection, while the 110 V DC solid-state operating mechanism ensures precise and efficient control.

Key Features & Benefit

• High-Power Performance: Rated for 80 A and 37 kW, this contactor handles significant electrical loads, making it ideal for heavy-duty motor control and other industrial machinery.
• Traction-Optimized Design: Built to meet the stringent requirements of traction applications, it provides reliable performance under challenging conditions.
• Enhanced Reliability: The solid-state operating mechanism offers greater longevity and switching accuracy compared to traditional coil mechanisms, while the integrated varistor protects against voltage spikes.
• Flexible Connectivity: It features screw terminals for the main circuit and spring-loaded terminals for control and auxiliary circuits, providing secure and efficient wiring.
• Integrated Auxiliary Contacts: The built-in 1 normally open (NO) + 1 normally closed (NC) auxiliary contacts allow for easy integration into control and signaling circuits.
• Energy Efficient: The solid-state control system operates within a wide control voltage range (0.7-1.25 Uc*), ensuring stable and energy-efficient performance.

Function

This Siemens contactor functions as a remotely operated electrical switch, used for making and breaking the main circuit of an electric motor or other load. The 110 V DC control signal activates the solid-state mechanism, closing the 3-pole main contacts and allowing power to flow. The AC-3e/AC-3 rating indicates its suitability for switching asynchronous motors, particularly during normal operation. The integrated auxiliary contacts can be used for feedback signals to a PLC, interlocks, or to switch other low-power devices, enhancing the overall safety and functionality of the control system.

Technical Specification

• Product Number: 3RT2045-3XF40-0LA2
• Type: Traction Contactor
• Current Rating (AC-3e/AC-3): 80 A
• Power Rating: 37 kW @ 400 V
• Poles: 3-pole
• Control Voltage: 110 V DC
• Operating Range: 0.7 – 1.25 * Uc
• Operating Mechanism: Solid-state
• Surge Protection: Integrated varistor
• Auxiliary Contacts: 1 NO + 1 NC
• Main Circuit Terminals: Screw terminals
• Control/Auxiliary Terminals: Spring-loaded terminals
• Frame Size: S3

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