Siemens SIRIUS 3RT2045-1NF30 Power Contactor, 80A, 37 kW (400V), 3-Pole, AC/DC Control 83-155V, Size S3 Original Brand New

Overview

The Siemens SIRIUS 3RT2045-1NF30 is a high-performance, 3-pole power contactor engineered for safe and reliable switching of electric motors and other resistive loads up to 80 A (for AC-3e/AC-3 operation). Part of the versatile SIRIUS 3RT2 family, this contactor is characterized by its compact design, high contact reliability, and global approvals. A key feature is its innovative wide-range AC/DC control voltage (83-155 V AC/DC) with an integrated varistor, simplifying control circuit design and providing coil protection.

Key Specification

• Product Number: 3RT2045-1NF30
• Manufacturer: Siemens
• Series: SIRIUS 3RT20
• Type: Power Contactor, 3-Pole
• Operational Current (Ie​): 80 A (AC-3e/AC-3 up to 400 V)
• Operational Power (AC-3): 37 kW at 400 V
• Control Supply Voltage (Us​): 83-155 V AC/DC, 50/60 Hz (Wide Range)
• Coil Protection: Integrated Varistor
• Auxiliary Contacts: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Terminal Type: Screw Terminal
• Contactor Size: S3
• Main Application: Switching Motors (DOL - Direct On-Line)

Function

The Siemens 3RT2045-1NF30 power contactor serves as an electrically controlled switch, primarily used to safely and frequently turn on and off power to electric motors (Direct On-Line starting) or other high-current loads in industrial automation systems.

The application of the wide-range control voltage (83-155 V AC/DC) energizes the internal coil, causing the main contacts to close and supply power to the motor. The integrated varistor protects the coil from overvoltage spikes that occur during switching, ensuring long-term reliability.

Application

• Direct-On-Line (DOL) Starting of 3-Phase Motors
• Switching of resistive and inductive loads in industrial plants.
• Integration into Motor Control Centers (MCCs) and control panels.
• Use in pumps, fans, conveyors, and machinery control.

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