Siemens SIRIUS 3RT2045-3AN20 Power Contactor AC-3e/AC-3, 80 A, 37 kW, 220 V AC, S3 Size Original Brand New

Overview: Siemens 3RT2045-3AN20 SIRIUS 3RT Power Contactor

The Siemens 3RT2045-3AN20 is a high-performance power contactor from the trusted SIRIUS 3RT2 series, designed for the switching of motors and other industrial loads. This robust and compact device offers a high current rating of 80 A for AC-3e/AC-3 applications, making it ideal for a wide range of motor control tasks. The S3 size ensures a balance of power handling capability and space efficiency within control cabinets.

Engineered with Siemens’ renowned quality, the 3RT2045-3AN20 guarantees a long electrical and mechanical lifespan, reducing maintenance and operational costs. The 220 V AC coil provides reliable control, while the integrated 1 NO + 1 NC auxiliary contacts offer flexibility for interlocking and signaling circuits. This model features a user-friendly combination of screw terminals for the main circuit and innovative, vibration-proof spring-loaded terminals for the control and auxiliary circuits, simplifying installation and ensuring a secure connection.

Key Product Features & Benefit

• High Performance: Rated for 80 A (AC-3e/AC-3) and capable of switching motors up to 37 kW at 400 V, providing reliable control for demanding applications.
• Compact S3 Size: Offers a powerful solution without occupying excessive space, perfect for optimizing control cabinet layouts.
• Integrated Auxiliary Contacts: The built-in 1 NO (Normally Open) and 1 NC (Normally Closed) contacts simplify wiring for feedback, interlocking, and status indication, eliminating the need for separate auxiliary blocks.
• Dual Terminal System: Features robust screw terminals for the main power circuit and fast, reliable spring-loaded terminals for the control and auxiliary circuits, ensuring easy and secure wiring.
• Versatile AC Coil: The 220 V AC, 50/60 Hz coil is suitable for a wide variety of standard industrial power systems.
• Proven Reliability: Part of the Siemens SIRIUS series, known globally for its durability, long operational life, and consistent performance in harsh industrial environments.
• Safety & Compliance: Designed to meet international standards for industrial control gear, ensuring safety and compatibility with existing systems.

Function

The Siemens 3RT2045-3AN20 functions as a remote-controlled switch for high-current loads. When the 220 V AC coil is energized, it generates a magnetic field that pulls a core, closing the main power contacts. This allows current to flow to a connected load, such as an electric motor. The auxiliary contacts switch simultaneously, providing signals to other parts of the control system (e.g., PLCs, indicator lights) to confirm the status of the contactor. When the coil is de-energized, the contacts open, and power to the load is cut off.

Technical Specification

• Product Number: 3RT2045-3AN20
• Manufacturer: Siemens
• Product Series: SIRIUS 3RT2
• Rated Current (AC-3e/AC-3): 80 A
• Rated Power (at 400 V): 37 kW
• Number of Poles: 3
• Control Supply Voltage: 220 V AC, 50/60 Hz
• Auxiliary Contacts: 1 NO + 1 NC
• Main Circuit Connection: Screw Terminals
• Control/Auxiliary Circuit Connection: Spring-Loaded Terminals
• Size: S3
• Mounting: DIN rail or screw mounting

Application

The Siemens 3RT2045-3AN20 is an essential component in numerous industrial applications, including:

• Controlling and switching AC motors (e.g., pumps, fans, compressors)
• Heating, Ventilation, and Air Conditioning (HVAC) systems
• Pumping and fluid control systems
• Industrial automation and machinery
• Building automation
• Material handling systems

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