Overview: Siemens SIRIUS 3RT2045-1AQ20 Power Contactor
The Siemens 3RT2045-1AQ20 is a high-performance, 3-pole SIRIUS power contactor designed for switching motors and other resistive loads in industrial control systems. As part of the SIRIUS 3RT2 series, this robust Size S3 contactor is engineered for reliability, high mechanical service life, and efficient operation in demanding environments. It is rated for 80 Amps (AC-3e/AC-3) and a power output of 37 kW at 400V, making it ideal for medium to high-power motor applications.
Key Features & Specifications
- Product Number: 3RT2045-1AQ20
- Contactor Series: Siemens SIRIUS 3RT2
- Operating Current (AC-3e/AC-3): 80 A
- Rated Power (400 V): 37 kW
- Number of Poles: 3-pole
- Control/Coil Voltage: 500 V AC, 50/60 Hz
- Auxiliary Contacts: 1 Normally Open (NO) + 1 Normally Closed (NC)
- Connection Type: Reliable Screw Terminal connections
- Contactor Size: S3
- High Insulation Voltage: 1000 V (Main Circuit)
Benefit
- Reliable Motor Control: Perfectly suited for safe and efficient switching of standard and high-efficiency motors up to 37 kW.
- Enhanced System Integration: Includes essential integrated auxiliary contacts (1 NO + 1 NC) for monitoring and interlocking circuits, reducing the need for external components.
- Robust and Durable: Designed with a high mechanical service life of up to 10 million operating cycles, minimizing maintenance and downtime.
- Easy Installation: Features robust screw terminals for secure wiring and a compact design (Size S3) for installation in control cabinets with limited space.
- Global Standard Compliance: Meets international standards (IEC, EN) including the latest AC-3e efficiency ratings.
Function and Application
The Siemens 3RT2045-1AQ20 Power Contactor is the central switching element in a motor starter or control circuit. It is primarily used to:
- Switch 3-Phase Motors: Start, stop, and control the direction of motors in pumps, fans, conveyors, and machine tools.
- Switch Resistive Loads: Control heating, lighting, and capacitor bank circuits.
- Implement Control Logic: The integrated 1 NO + 1 NC auxiliary contacts allow the contactor's status to be integrated into safety and control feedback loops.
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