Siemens SIRIUS 3RT2045-1AN20 Power Contactor, 80A, 37kW, 220V AC Coil, Screw Terminal, Size S3 Original Brand New

Overview

The Siemens SIRIUS 3RT2045-1AN20 is a high-performance power contactor designed for industrial control applications. This 3-pole contactor is engineered to switch motors and other resistive loads with exceptional reliability and efficiency. Featuring a robust design and a compact Size S3 frame, it is ideal for space-constrained installations while providing a high switching capacity of 80 A (AC-3e/AC-3) and up to 37 kW at 400 V.

The 220 V AC control coil, coupled with integrated 1 NO and 1 NC auxiliary contacts, ensures versatile and seamless integration into various control circuits. The secure screw terminal connections offer a reliable and straightforward wiring process.

Benefit

• High Performance: Handles demanding motor loads up to 37 kW and a switching current of 80 A, ensuring reliable operation in heavy-duty applications.
• Space-Saving Design: The compact Size S3 frame allows for efficient use of panel space, making it suitable for modern, high-density electrical cabinets.
• Integrated Auxiliary Contacts: The built-in 1 Normally Open (NO) and 1 Normally Closed (NC) contacts simplify control circuit design and reduce the need for external components.
• Reliable Connections: Robust screw terminals provide a secure and vibration-resistant connection, minimizing maintenance and maximizing uptime.
• Global Compatibility: Designed for 50/60 Hz frequencies, the 220 V AC coil is compatible with standard power systems worldwide.
• Durability: Part of the trusted Siemens SIRIUS line, known for its long service life and high mechanical and electrical endurance.

Function

The Siemens 3RT2045-1AN20 functions as an electrically controlled switch used to turn a power circuit on or off. When the 220 V AC coil is energized, an electromagnet is created, which closes the main contacts, allowing power to flow to the connected load (e.g., an electric motor).

Simultaneously, the integrated auxiliary contacts change state—the NO contact closes and the NC contact opens—providing feedback and control signals to the larger automation system. When the coil is de-energized, the contacts return to their original state.

Technical Specification

• Product Number: 3RT2045-1AN20
• Product Type: Power Contactor
• Main Poles: 3-pole
• Rated Operating Current (AC-3e/AC-3): 80 A
• Rated Power (AC-3e/AC-3): 37 kW at 400 V
• Control Coil Voltage: 220 V AC, 50/60 Hz
• Auxiliary Contacts: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Termination Type: Screw Terminal
• Size: S3

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