Siemens SIRIUS 3RT2045-3AC20 Power Contactor, 80A, 37kW, 24V AC Coil, Screw/Spring-Loaded Terminals, Size S3 Original Brand New

Overview

The Siemens SIRIUS 3RT2045-3AC20 is a high-performance, 3-pole power contactor designed for reliable switching of electric motors and other resistive loads in industrial control systems. Part of the robust SIRIUS family of switching devices, this contactor offers exceptional current handling capability and long mechanical service life.

Engineered for AC-3e/AC-3 applications, the Size S3 unit features an $80\text{ A}$ rated operational current and a $37\text{ kW}$ power rating at $400\text{ V}$. Its hybrid terminal system combines secure screw connections for the main power circuit and time-saving spring-loaded terminals for the control and auxiliary circuits, ensuring fast, safe, and reliable wiring.

Key Specification

• Product Number: 3RT2045-3AC20
• Manufacturer: Siemens
• Series: SIRIUS 3RT2
• Contactor Size: S3
• Poles: 3-pole
• Rated Operational Current (AC-3e/AC-3): $80\text{ A}$
• Rated Operational Power (AC-3): $37\text{ kW}$ at $400\text{ V}$
• Control Coil Voltage: $24\text{ V AC}$ (50/60 Hz)
• Auxiliary Contacts: $1\text{ NO}+1\text{ NC}$ (Integrated)
• Main Circuit Connection: Screw Terminal
• Control/Auxiliary Circuit Connection: Spring-Loaded Terminal

Benefit

1. High Reliability for Motor Switching: Rated for demanding AC-3e/AC-3 applications, providing secure and efficient control of motors up to $37\text{ kW}$.
2. Dual Terminal Technology: Features heavy-duty screw terminals for the main power connections for maximum contact security, and innovative spring-loaded terminals for control wiring, dramatically reducing installation and maintenance time.
3. Space-Saving Design (Size S3): Offers a compact footprint relative to its $80\text{ A}$ capacity, optimizing space within control cabinets.
4. Integrated Auxiliary Contacts: The built-in $1\text{ NO}+1\text{ NC}$ auxiliary contacts provide immediate feedback for monitoring and interlocking circuits, simplifying the control panel design.
5. Globally Recognized Quality: As a Siemens SIRIUS product, it guarantees German engineering quality, adherence to international standards (IEC), and seamless integration with other SIRIUS components.

Function

The Siemens 3RT2045-3AC20 power contactor serves as an electrically controlled switch used for remote make-and-break operations of main power circuits. Upon energizing the $24\text{ V AC}$ control coil, the magnetic force closes the 3 main power contacts, allowing current to flow to the connected load (e.g., a 3-phase motor).

The integrated auxiliary contacts simultaneously change state, providing signals for the control system’s logic or for operating indicator lights. Its robust design ensures millions of reliable switching cycles, making it ideal for frequent switching operations.

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