Siemens SIRIUS 3RT2 Power Contactor 80A, 37kW (400V), 3-Pole, 24V AC Coil, Spring-Loaded Terminal, Size S3 Original Brand New

Overview

The Siemens SIRIUS 3RT2045-3AB00 power contactor is a high-performance switching device designed for reliable motor and load control in industrial automation applications. As part of the modular SIRIUS 3RT2 system, this compact 3-pole contactor is rated for an operational current of $80\text{ A}$ (AC-3e/AC-3) and a power rating of $37\text{ kW}$ at $400\text{ V}$. It features a $24\text{ V AC}$ (50 Hz) control coil and comes equipped with $1\text{ NO}+1\text{ NC}$ integrated auxiliary contacts for enhanced circuit feedback and control.

A key feature of the 3RT2045-3AB00 is its versatile connection system: the main circuit utilizes screw terminals for robust power connections, while the control and auxiliary circuits employ spring-loaded terminals for fast, vibration-proof, and maintenance-free wiring. This contactor is built in Size S3, offering a powerful solution within a compact design and is approved for worldwide use (e.g., IEC and UL/CSA).

Key Benefit

• Fast & Secure Wiring: Spring-loaded terminals on the control and auxiliary circuits ensure quick installation and reliable, vibration-proof connections.
• High Performance: $80\text{ A}$ AC-3 rating for switching electric motors up to $37\text{ kW}$.
• Modular SIRIUS System: Seamlessly integrates with other SIRIUS components (e.g., overload relays, auxiliary switches) for flexible load feeder configurations.
• Space-Saving Design: Compact Size S3 form factor optimizes control cabinet space.
• Global Compliance: Approved for international use, including IEC and UL/CSA standards.

Function/Application

The Siemens 3RT2045-3AB00 is a standard power contactor primarily used for switching electric motors, heating loads, and other three-phase loads in industrial environments. Its typical functions include:

• Starting and stopping motors (in conjunction with an overload relay).
• Switching resistive loads (AC-1 operation).
• Creating reversing and star-delta (wye-delta) motor starters.
• Serving as a reliable interface between the control system and the power circuit.

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