3RT2045-1KB40-1AA0

Description

Overview

The Siemens 3RT2045-1KB40-1AA0 is a high-performance 3-pole power contactor from the robust SIRIUS 3RT20 series (Size S3). Engineered for the efficient and reliable switching of electric motors and other industrial loads, this contactor is rated for 80 A (AC-3e/AC-3) and supports motor power up to 37 kW at 400 V. It features a highly versatile 24 V DC coil with an extended operating range and an integrated varistor for surge suppression, ensuring maximum coil longevity and system protection. Its compact design and PLC compatibility make it an ideal choice for modern industrial automation and motor control applications.

Key Features & Function

• Rated Current & Voltage: AC-3e/AC-3, 80 A, 37 kW / 400 V

• Coil Voltage: 24 V DC (0.8–1.2 * Uc)

• Poles: 3-pole for three-phase applications

• Integrated Varistor: Provides overvoltage protection and enhances contactor lifespan

• Auxiliary Contacts: 1 NO + 1 NC for flexible control and signaling

• Terminal Type: Screw terminals for secure wiring

• Frame Size: S3

• Mounting Position: Upright, suitable for panel installation

• PLC Compatibility: Perfect for automation and PLC outputs

Benefit

• Reliable Switching: Ensures smooth operation in heavy-duty motor and industrial circuits

• Enhanced Protection: Integrated varistor reduces voltage spikes and protects connected equipment

• Versatile Control: Auxiliary contacts enable additional signaling and control functions

• Durable Construction: Siemens quality ensures long-term performance in demanding environments

• Easy Integration: Compatible with standard PLC outputs and upright mounting

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