Siemens 3RT2045-1AC20 Power Contactor 80A, 37kW (S3 Size) with 24V AC Coil and Screw Terminals Original Brand New

Overview

The Siemens 3RT2045-1AC20 is a high-performance power contactor designed for reliable and efficient switching of electrical loads in industrial applications. As part of the SIRIUS 3RT2 series, this robust 3-pole contactor is engineered to handle significant power, with a rated operational current of 80 A and a power rating of 37 kW at 400 V.

Its compact S3 size makes it an excellent choice for panel builders and system integrators looking to save space without compromising on performance. The integrated 24 V AC coil provides a standard control voltage for seamless integration into most industrial control systems.

Key Benefit

• Exceptional Durability: Built to withstand demanding industrial environments, ensuring a long service life and reduced maintenance costs.
• High Power Handling: Rated for 80 A and 37 kW, it is suitable for controlling a wide range of motors, heaters, and other inductive loads.
• Space-Saving Design: The compact S3 size allows for higher density installations in control cabinets, optimizing panel space.
• Versatile Auxiliary Contacts: Features a 1 NO (Normally Open) and 1 NC (Normally Closed) auxiliary contact configuration, providing flexible feedback and control options.
• Secure & Reliable Connections: The screw terminals ensure a strong, vibration-resistant connection, minimizing the risk of power loss or failure.
• Broad Application Range: Ideal for applications rated AC-3e/AC-3, including motor control, lighting systems, and heating circuits.

Function

The Siemens 3RT2045-1AC20 power contactor is a core component in any motor control or power switching circuit. It functions as a remotely controlled switch. When the 24 V AC control voltage is applied to the coil, it generates a magnetic field that closes the main power contacts, allowing current to flow to the connected load.

When the voltage is removed, the contacts open, interrupting the power supply. The integrated auxiliary contacts switch simultaneously, providing status feedback to the control system (e.g., indicating whether the main contacts are open or closed) and can be used for interlocking or control logic.

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