Siemens 3RT2045-1AG20 SIRIUS Power Contactor, 80 A, 37 kW, 110 V AC, S3 Screw Terminal Original Brand New

Overview

The Siemens 3RT2045-1AG20 is a high-performance SIRIUS 3RT2 series power contactor designed for reliable switching of motors and other electrical loads. This robust 3-pole contactor is rated for AC-3e/AC-3 operation up to 80 A and is suitable for applications up to 37 kW at 400 V. Featuring a universal 110 V AC control coil (50/60 Hz) and built-in 1 NO + 1 NC auxiliary contacts, it provides both powerful switching capability and integrated control feedback. The S3 size and secure screw terminals ensure easy and reliable installation in industrial control panels and machinery. As part of the SIRIUS family, the 3RT2045-1AG20 is engineered for long-term durability, efficiency, and seamless integration into automation systems.

Key Features & Benefit

• High Performance: With an 80 A rating for AC-3e/AC-3, this contactor reliably handles demanding motor and load switching applications.
• Energy Efficiency: The SIRIUS 3RT2 series is known for its low power consumption, reducing operational costs and heat generation.
• Integrated Auxiliary Contacts: The built-in 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts simplify wiring for control circuits, signaling, and interlocking.
• Robust & Durable: Engineered for industrial environments, the contactor offers a long electrical and mechanical lifespan, minimizing maintenance and downtime.
• Universal Coil Voltage: The 110 V AC control coil operates on both 50 Hz and 60 Hz frequencies, making it versatile for various global applications.
• User-Friendly Installation: Standardized S3 size and clear screw terminals make wiring straightforward and secure.
• Compact Design: Despite its high power rating, the S3 size ensures a space-saving footprint in control cabinets.

Functionality

The Siemens 3RT2045-1AG20 functions as an electromagnetically operated switch. When the 110 V AC control coil is energized, it closes the three main power poles, allowing current to flow to the connected motor or load. Simultaneously, the integrated auxiliary contacts change state—the NO contact closes and the NC contact opens—to provide feedback for the control system. When the coil is de-energized, springs open the main contacts, interrupting the power flow. The screw terminals provide a secure connection for both the main power cables and the control circuit wiring.

Technical Specification

• Product Number: 3RT2045-1AG20
• Rated Current (AC-3e/AC-3): 80 A
• Rated Power: 37 kW @ 400 V
• Number of Poles: 3-pole
• Control Coil Voltage: 110 V AC, 50/60 Hz
• Auxiliary Contacts: 1 NO + 1 NC
• Termination: Screw Terminals
• Size: S3

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