Siemens SIRIUS 3RT2045-3NF30 Power Contactor 80 A, 37 kW, 3-Pole, 83-155V AC/DC Coil, Spring-Loaded, Screw Terminal, Size S3 Original Brand New

Overview

The Siemens 3RT2045-3NF30 is a high-performance SIRIUS 3RT2 power contactor designed for reliable switching of motors and resistive loads up to 80 Amps (AC-3e/AC-3). Part of the compact and modular SIRIUS system, this 3-pole contactor is rated for 37 kW at 400V and offers exceptional contact reliability in a space-saving Size S3 form factor. It is specifically equipped with a flexible 83-155 V AC/DC wide-range control voltage coil with an integrated varistor for surge suppression, ensuring maximum operational reliability. The unit includes 1 NO (Normally Open) + 1 NC (Normally Closed) auxiliary contacts for control circuit integration.

Key Technical Specification

• Product Type: Power Contactor (Motor Switching)
• Model Number: 3RT2045-3NF30
• Manufacturer: Siemens (SIRIUS 3RT2 Series)
• Operating Current (AC-3e/AC-3): $80\text{ A}$
• Rated Power (400 V): $37\text{ kW}$
• Number of Poles: 3-pole
• Control Supply Voltage (Us): $83\text{ V}$ to $155\text{ V AC/DC}$ (Wide Range Coil)
• Surge Protection: Integrated Varistor
• Auxiliary Contacts: $1\text{ NO}+1\text{ NC}$
• Main Circuit Connection: Screw Terminal
• Control/Auxiliary Circuit Connection: Spring-Loaded Terminal (Fast, vibration-proof wiring)
• Size: S3

Benefit

1. High Efficiency & Compact Design: Excellent performance to size ratio, optimizing control cabinet space.
2. Wide-Range AC/DC Operation: The 83-155V AC/DC coil reduces complexity and part numbers by operating over a broad voltage range, simplifying inventory.
3. Enhanced Reliability: Integrated varistor provides built-in surge suppression, protecting the coil and increasing service life.
4. Flexible Connection Technology: Features robust screw terminals for the main circuit and vibration-proof, maintenance-free spring-loaded terminals for the control/auxiliary circuits, offering secure and fast wiring.
5. Global Compatibility: Climate-resistant and approved for worldwide use (e.g., IEC and UL/CSA), making it suitable for international machine building.
6. IE3/IE4 Ready: Designed for seamless integration with high-efficiency IE3 and IE4 motors.

Function

The 3RT2045-3NF30 is primarily used in industrial control systems for motor switching applications. Its main function is to reliably and safely switch the current to a three-phase motor. The integrated auxiliary contacts allow for feedback and control logic within the automation system.

Application

• Motor control for pumps, fans, and compressors
• Machine tool control systems
• Heating and lighting circuits (where $80\text{ A}$ switching capacity is required)
• Integration into load feeders and motor starter combinations (e.g., with SIRIUS 3RV2 motor starter protectors).

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