Siemens 3RT2045-3AF00 Power Contactor, 80A, 37kW, 400V, AC 110V Coil, Size S3, Spring-Loaded Terminal Original Brand New

Product Overview

The Siemens 3RT2045-3AF00 Power Contactor from the SIRIUS 3RT2 series is a high-performance, compact switching device engineered for reliable motor control and load switching in industrial applications. Designed for maximum efficiency and longevity, this 3-pole contactor handles a significant operational current of 80 A (AC-3e/AC-3) and is rated for motors up to 37 kW at 400 V.

The unit is distinguished by its dual-terminal configuration: the main circuit utilizes robust screw terminals, while the control and auxiliary circuits feature modern spring-loaded terminals for fast, vibration-proof, and maintenance-free wiring. It operates with a 110 V AC, 50 Hz control supply voltage and includes integrated auxiliary contacts (1 Normally Open (NO) + 1 Normally Closed (NC)).

Benefits & Advantages

• Fast, Secure Wiring: Spring-loaded terminals for the control and auxiliary circuits ensure quick installation and a highly vibration-proof connection, reducing maintenance time and improving operational reliability.
• High Power Density: The compact Size S3 design allows for significant power switching (80A, 37kW) in a smaller footprint, optimizing panel space.
• Global Compliance: Approved for worldwide use (e.g., IEC and UL/CSA), ensuring suitability for international machine building and integration.
• Integrated Auxiliary Contacts: The built-in $1\text{ NO}+1\text{ NC}$ contacts reduce the need for external components, simplifying the circuit design and minimizing wiring complexity.
• Future-Proof: Fully compatible with high-efficiency motors, being IE3/IE4 ready, supporting modern energy standards.

Function

The 3RT2045-3AF00 is primarily used to switch electric motors and resistive loads (AC-3 and AC-1 applications). It acts as the core component in motor starters, enabling the remote control and safe operation of machinery.

Application

• Motor Control: Switching 3-phase asynchronous motors in machinery, pumps, compressors, and ventilation systems (up to $37\text{ kW}$).
• Load Feeder Construction: Forming part of an optimally coordinated load feeder assembly when combined with overload relays and circuit breakers from the SIRIUS modular system.
• Industrial Automation: Integration into control cabinets for automated industrial processes requiring frequent switching.
• Heating and Lighting: Switching large resistive loads (AC-1) such as industrial heating elements or high-power lighting circuits.

Installation and Integration

The SIRIUS 3RT2 contactors are designed for seamless integration within the Siemens modular system. The main circuit connections use robust screw terminals suitable for high current paths, while the innovative spring-loaded terminals (cage clamp) on the control side allow for rapid, tool-free connection of ferrules or solid wires, ensuring a permanent and reliable connection even under vibration.

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