Siemens 3RT2045-1CP04-3MA0 SIRIUS 3RT2 Power Contactor 80A, 37kW, 230V AC, S3 Original Brand New

Overview: SIRIUS 3RT2 Power Contactor 3RT2045-1CP04-3MA0

The Siemens SIRIUS 3RT2045-1CP04-3MA0 is a high-performance 3-pole power contactor designed for reliable switching of motors and other industrial loads up to 80 A (AC-3e/AC-3). Part of the trusted SIRIUS 3RT2 family, this robust component is rated for 37 kW at $400\text{ V}$ and features an $\text{AC }230\text{ V},50\text{ Hz}$ coil.

This Size S3 contactor is built for durability and ease of integration into demanding industrial environments. It comes equipped with a plugged-in varistor for essential surge suppression, protecting your system’s control electronics. For expanded control functionality, it includes $2\text{ NO}+2\text{ NC}$ auxiliary contacts and utilizes reliable screw terminals for all connections.

Key Benefit

• System Protection: The pre-installed plugged-in varistor effectively suppresses switching surges, significantly extending the life of the contactor coil and protecting upstream control components.
• Reliable Performance: Rated for $80\text{ A}$ and $37\text{ kW}$, it offers high reliability for switching three-phase motors and general industrial loads (AC-3e/AC-3).
• Enhanced Control: Integrated $2\text{ NO}+2\text{ NC}$ captive auxiliary contacts provide expanded signalling and interlocking options without needing external add-ons.
• Durable & Long-Life: Robust design ensures a long mechanical service life (up to $10,000,000$ operating cycles), making it suitable for demanding, high-frequency switching applications.
• Easy Installation: Standard Size S3 form factor and user-friendly screw terminals simplify installation and maintenance on a DIN rail.

Function

The Siemens 3RT2045-1CP04-3MA0 contactor functions as an electrically controlled switch for large power circuits. When the $230\text{ V AC}$ coil is energized, the main contacts close, connecting the $3$-phase power supply to the load (e.g., an industrial motor). The captive auxiliary contacts switch simultaneously, providing feedback to the control system ($\text{NO}$ contacts) and enabling safety interlocks ($\text{NC}$ contacts). The $\text{AC }230\text{ V}$ operating voltage and $\text{Size S3}$ dimensions make it an ideal choice for standard industrial motor control panels requiring a powerful, compact solution.

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