Siemens 3RT2045-3AG20 Power Contactor, 80A, 3-Pole, 110V AC, S3 Size, Screw/Spring-Loaded Terminal Original Brand New

Overview

The Siemens 3RT2045-3AG20 is a robust and reliable power contactor designed for the switching of electrical loads, particularly motors. Part of the renowned SIRIUS series, this S3-sized contactor is engineered for demanding industrial applications. It features a rated operational current of 80 A for AC-3e/AC-3 applications at 400 V and is capable of handling a motor power of 37 kW. The contactor is equipped with a 110 V AC control voltage for 50/60 Hz operation.

Its versatile terminal design combines a screw-type main circuit connection for secure power wiring with spring-loaded terminals for fast and reliable control and auxiliary circuit wiring, saving valuable installation time.

Key Features & Benefit

• High Performance: With an 80 A rating (AC-3e/AC-3) and a 37 kW motor power capacity at 400 V, this contactor is built to handle heavy-duty loads efficiently.
• Space-Saving Design: The compact size S3 minimizes the required space in control cabinets and panels.
• Dual Terminal System: The combination of screw terminals for the main circuit and spring-loaded terminals for the control/auxiliary circuit offers the best of both worlds: high-current security and quick, tool-free wiring for control signals.
• Integrated Auxiliary Contacts: The built-in 1 NO + 1 NC (Normally Open + Normally Closed) auxiliary contacts provide easy integration into control circuits and signaling systems without the need for additional modules.
• Global Standard Compliance: As a Siemens SIRIUS product, the 3RT2045-3AG20 meets international standards, ensuring reliability and compatibility in a wide range of industrial settings.
• Enhanced Safety: The secure screw connections on the main circuit prevent accidental loosening, ensuring a safe and stable electrical connection.
• Easy Maintenance: The clearly marked terminals and robust construction simplify installation, inspection, and maintenance procedures.

Technical Specification

• Product Type: Power Contactor
• Product Number: 3RT2045-3AG20
• Series: SIRIUS 3RT
• Operating Current (AC-3e/AC-3): 80 A
• Motor Power: 37 kW at 400 V
• Poles: 3-pole
• Control Voltage: 110 V AC (50/60 Hz)
• Auxiliary Contacts: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Main Circuit Connection: Screw Terminal
• Control & Auxiliary Circuit Connection: Spring-Loaded Terminal
• Size: S3
• Operating Frequency: 50/60 Hz
• Compatibility: Designed for use in combination with overload relays, circuit breakers, and other control components.

Function

The Siemens 3RT2045-3AG20 power contactor functions as an electrically operated switch. When the 110 V AC control coil is energized, it closes the main power contacts, allowing current to flow to the connected load, typically a motor. When the control voltage is removed, the contacts open, interrupting the power supply. The integrated auxiliary contacts switch in tandem with the main contacts, providing a crucial feedback signal for control systems or for interlocking with other electrical components.

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