Siemens SIRIUS 3RT2038-3KB44-3MA0 Power Contactor 80A, 37kW, 24V DC Original Brand New

Overview

The Siemens 3RT2038-3KB44-3MA0 is a high-performance SIRIUS series power contactor designed for reliable switching of motors and resistive loads. This 3-pole contactor is rated for 80 A (AC-3e/AC-3) and 37 kW at 400 V, making it ideal for demanding industrial applications.

The unit features a 24 V DC control voltage with a wide tolerance of 0.8 to 1.2 times the rated control supply voltage (Uc​), ensuring stable operation even with voltage fluctuations. It also comes with an integrated varistor for surge protection, extending the lifespan of the coil and connected components.

Key Features & Function

• High-Rated Performance: Capable of handling up to 80 A and 37 kW, suitable for medium to high-power motor applications.
• Versatile Control: Operates on a 24 V DC control voltage, making it perfect for integration with modern control systems and PLC outputs. The wide voltage tolerance (0.8-1.2*Uc​) ensures reliability.
• Integrated Protection: Includes an integrated varistor to suppress voltage spikes, protecting the control coil and ensuring a longer service life.
• Comprehensive Auxiliary Contacts: Equipped with 2 NO (normally open) and 2 NC (normally closed) auxiliary contacts, providing flexibility for signaling, interlocking, and control circuit applications.
• Dual Terminal System: The main circuit utilizes robust screw terminals for secure and high-current connections. The control and auxiliary circuits feature convenient and time-saving spring-loaded terminals.
• Space-Saving Design: Part of the compact SIRIUS S2 frame size, allowing for efficient use of panel space.
• PLC-Optimized: Specifically designed to be suitable for PLC outputs, simplifying integration into automated systems.
• Captive Auxiliary Switch: The auxiliary switch is integrated and captive, preventing loss during installation and maintenance.

Benefit

• Enhanced Reliability: The integrated varistor and wide voltage tolerance contribute to a more reliable and stable operation, reducing downtime.
• Easy Integration: The 24 V DC control and PLC compatibility simplify integration into existing or new automation systems.
• Reduced Installation Time: The combination of screw terminals for power and spring-loaded terminals for control circuits streamlines the wiring process.
• Space Efficiency: The compact S2 frame size helps optimize control cabinet layouts.
• Safety and Durability: The robust construction and integrated features ensure long-term durability and safe operation under tough industrial conditions.

Application

• Motor control for pumps, fans, compressors, and conveyors
• Switching of heating systems and lighting
• Integration into machine and plant automation systems
• Industrial control panels and switchgear assemblies

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