Siemens 3RT2045-3SB30 SIRIUS 3RT2 Power Contactor 80A, 37kW, AC-3e/AC-3, 21-33V AC/DC Coil, S3 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2045-3SB30 Power Contactor is a robust, 3-pole switching device engineered for controlling AC motors and other demanding industrial loads up to 80 A and 37 kW at 400 V (AC-3e/AC-3). Part of the SIRIUS modular system, this size S3 contactor is designed for high-performance and reliable operation in diverse automation environments.

Key Product

• Article Number: 3RT2045-3SB30
• Performance: 80 A (AC-3e/AC-3), 37 kW / 400 V
• Poles: 3-pole (3 NO main contacts)
• Control Voltage: Wide range 21-33 V AC/DC for versatile use.
• Surge Protection: Integrated varistor for superior coil protection.
• Safety Feature: F-PLC-IN (Fail-safe PLC Input) for safety-related connections.
• Auxiliary Contacts: 1 NC (Normally Closed)
• Terminals: Main circuit via screw terminals; Control/Auxiliary circuit via efficient spring-loaded terminals.

Benefit

• Enhanced Reliability: The integrated varistor provides effective surge protection, extending the lifespan and ensuring reliable operation of the control coil.
• Safety Integration: The F-PLC-IN feature allows for direct, simplified connection to safety-related controllers, making it ideal for safety-critical machine applications.
• Efficient Wiring: The combination of traditional screw terminals for the main circuit and time-saving spring-loaded terminals for the control circuit significantly reduces wiring time and complexity.
• Universal Control: The wide AC/DC voltage range ($21\text{ V to }33\text{ V}$) simplifies procurement and stocking, as a single contactor works with various common control voltages.
• Compact & Modular: Being part of the SIRIUS modular system (Size S3), it ensures optimal coordination and simple combination with other SIRIUS components like overload relays.

Function & Application

The 3RT2045-3SB30 contactor functions as an electrically operated switch primarily used for switching electric motors in industrial settings.

Typical Applications:

• Motor Control: Switching 3-phase AC motors up to 37 kW.
• Automation Systems: Integration into fail-safe PLC circuits (via F-PLC-IN) in machinery and plant engineering.
• Load Switching: Controlling resistive loads, capacitor banks, or heating systems.

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