Siemens SIRIUS 3RT2045-1AP04 Power Contactor, 80A, 37kW, 230V AC Coil, Size S3, Screw Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT2045-1AP04 Power Contactor is a high-performance, 3-pole electrical control device specifically engineered for switching motors and other electrical loads in industrial applications. As part of the highly versatile SIRIUS 3RT2 modular system, this size S3 contactor offers reliable performance and exceptional contact reliability within a compact design. It is rated for 80 A at 37 kW / 400 V (AC-3e/AC-3) and features a control coil voltage of 230 V AC, 50 Hz. Its robust construction, including screw terminals and a removable auxiliary switch, makes it a preferred choice for motor control, automation, and industrial switching tasks globally.

Technical Benefit & Key Features

• High Performance: Capable of handling up to 80 A rated operating current and 37 kW at $400\text{ V AC}$ (AC-3e/AC-3).
• Reliable Motor Switching: Designed for safe and efficient switching of standard and high-efficiency IE3/IE4-ready three-phase AC motors.
• Integrated Auxiliary Contacts: Comes pre-equipped with a removable auxiliary switch block providing 2 NO + 2 NC contacts for simplified control and monitoring circuit integration.
• Robust Connection: Utilizes proven screw terminals on both the main and auxiliary circuits for secure, reliable wiring.
• Compact & Modular: Size S3 design integrates seamlessly into the SIRIUS modular system, allowing for easy combination with other components like overloads and function modules.
• Global Compliance: Climate-resistant and approved for worldwide use (e.g., IEC and UL/CSA standards).
• Easy Integration: Optimized for connection to automation systems (parallel wiring, ASi, or IO-Link).

Function/Application

The Siemens 3RT2045-1AP04 contactor is primarily used as a main switching device in motor control applications, including:

• Direct-On-Line (DOL) Starters: Starting and stopping three-phase AC motors.
• Industrial Automation: Switching power circuits for lighting, heating, ventilation, and other non-motor loads.
• Reversing Starters: Used in combination with a second contactor for changing the motor’s direction of rotation.
• Load Feeders: Central component in standardized load feeder assemblies for machine control panels.

Specification Summary

• Product Type: Power Contactor (Motor Contactor)
• Brand: Siemens SIRIUS
• Model/MLFB: 3RT2045-1AP04
• Frame Size: S3
• Poles: 3-pole (3 NO main contacts)
• Rated Current (AC-3e/AC-3): $80\text{ A}$ at $400\text{ V}$
• Rated Power (AC-3): $37\text{ kW}$ at $400\text{ V}$
• Control Voltage (Coil): $230\text{ V AC},50\text{ Hz}$
• Auxiliary Contacts: $2\text{ NO}+2\text{ NC}$ (removable)
• Main Circuit Connection: Screw Terminal

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