Siemens 3RT2045-1NB34-3MA0 SIRIUS Power Contactor, 80A, 37kW, 2NO+2NC, S3 Size Original Brand New

Overview

The Siemens 3RT2045-1NB34-3MA0 is a high-performance SIRIUS 3RT2 series power contactor designed for reliable switching of motors and other resistive loads. This robust 3-pole contactor is rated for 80 A and 37 kW at 400 V (AC-3e/AC-3), making it suitable for a wide range of industrial applications.

Its compact size S3 design and flexible 20-33 V AC/DC control voltage with an integrated varistor simplify installation and provide enhanced surge protection. The included 2 NO + 2 NC auxiliary contacts offer versatile control and signaling options, while the secure screw terminals ensure a reliable and easy connection.

Key Features & Benefit

• High Power Rating: Handles up to 80 A and 37 kW, suitable for demanding motor control and load switching tasks.
• Versatile Control: Operates on a wide 20-33 V AC/DC control voltage range, allowing for greater flexibility in your control system design.
• Integrated Varistor: Protects the coil from voltage spikes, extending the lifespan of the contactor and improving system reliability.
• Comprehensive Auxiliary Contacts: Features a 2 NO + 2 NC configuration (captive auxiliary switch), providing multiple options for interlocking, status feedback, and control circuits.
• Robust & Compact Design: The size S3 form factor is engineered for space-saving installations in control panels without compromising performance.
• Secure Screw Terminals: Ensures a strong, vibration-resistant connection for safe and reliable operation.
• Durable Performance: Built with high-quality materials to withstand harsh industrial environments and frequent switching cycles.

Function

• Motor Switching: Efficiently controls the ON/OFF state of electric motors in various applications such as pumps, fans, and conveyor systems.
• Load Switching: Used for switching other types of loads, including heating elements and lighting systems, within its rated capacity.
• Safety & Interlocking: The auxiliary contacts enable critical safety functions and interlocking with other components in a control circuit.
• Automation Integration: Seamlessly integrates with PLC and other automation systems for automated control processes.

Technical Specification 

• Product Number: 3RT2045-1NB34-3MA0
• Product Type: Power Contactor
• Series: SIRIUS 3RT2
• Current Rating (AC-3e/AC-3): 80 A
• Power Rating (AC-3e/AC-3): 37 kW @ 400 V
• Number of Poles: 3-pole
• Control Voltage: 20-33 V AC/DC (50/60 Hz)
• Auxiliary Contacts: 2 NO + 2 NC (captive auxiliary switch)
• Terminal Type: Screw Terminal
• Size: S3
• Special Features: Integrated Varistor

Application

• Industrial automation
• Motor control centers (MCC)
• HVAC systems
• Pump stations
• Conveyor systems
• General load switching
• Machine building

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