Siemens SIRIUS 3RT2045-1AC24 Power Contactor, 80A, 37kW, 400V, 24V AC Coil, Size S3, 3-Pole, Screw Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT2045-1AC24 is a high-performance 3-pole power contactor designed for reliably switching motors and other resistive loads up to 80 Amps (AC-3e/AC-3). Part of the compact and modular SIRIUS 3RT2 series, this Size S3 contactor provides a switching capacity of 37 kW at 400 V. It features a standard 24 V AC, 50/60 Hz control coil and is equipped with an integrated, removable auxiliary switch block providing 2 Normally Open (NO) + 2 Normally Closed (NC) auxiliary contacts for control circuit applications. Its robust design and screw terminal connections ensure easy, secure installation in industrial control panels.

Benefit

• High Performance in Compact Design: Delivers 80A/37kW switching capability from a space-saving Size S3 frame, optimizing panel real estate.
• Integrated Auxiliary Contacts: The built-in, removable 2 NO + 2 NC auxiliary switch simplifies wiring and reduces the need for external components.
• Global Standard Compliance: SIRIUS 3RT2 contactors are climate-resistant and approved for worldwide use (e.g., IEC and UL/CSA standards).
• Easy Integration: Part of the Siemens SIRIUS modular system, allowing for seamless combination with motor protection components like overloads and soft starters.
• Secure & Reliable Connections: Screw terminals provide a time-tested, secure, and robust connection for both main and control circuits.
• IE3/IE4 Ready: Optimized for use with high-efficiency IE3 and IE4 motors.

Function / Application

The Siemens 3RT2045-1AC24 Contactor is essential for:

1. Motor Control: Switching the supply to 3-phase AC motors up to 37 kW at 400V.
2. Load Feeder Construction: Forming complete load feeders in combination with circuit breakers and overload relays (e.g., SIRIUS 3RV2).
3. Industrial Automation: Used in various industrial machinery, conveyor systems, pumps, fans, and HVAC applications for reliable ON/OFF switching.
4. Control Circuit Signalization: The $2\text{ NO }+2\text{ NC}$ auxiliary contacts are perfect for feedback and interlocking in the control circuit.

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