Siemens 3RT2038-1NB34 Power Contactor, 80A, 37kW, 20-33V AC/DC, Size S2 Original Brand New

Overview: Siemens 3RT2038-1NB34 SIRIUS Power Contactor

The Siemens 3RT2038-1NB34 is a high-performance, 3-pole power contactor from the SIRIUS 3RT2 modular system, specifically engineered for switching motors and industrial loads. Rated for 80 A (AC-3e/AC-3 at 400 V) and 37 kW at 400 V, this robust Size S2 contactor is suitable for demanding applications.

A key feature is its flexible control circuit, utilizing a 20-33 V AC/DC coil with an integrated varistor for enhanced surge protection, ensuring reliable operation and extended coil life. It comes equipped with a pre-assembled, removable auxiliary switch block providing 2 Normally Open (NO) + 2 Normally Closed (NC) contacts, simplifying wiring and commissioning. All connections are facilitated via reliable screw terminals. This model replaces the well-proven 3RT1 series for motor switching applications up to 37 kW.

Benefits & Advantages

• High Performance: Capable of safely and reliably switching motors up to 37 kW at 400 V (80 A).
• Flexible Control: Universal 20-33V AC/DC control voltage allows for use in both AC and DC control systems, reducing stock complexity.
• Integrated Protection: The built-in varistor suppresses voltage spikes in the coil circuit, enhancing system reliability and contactor longevity.
• Ready for Complex Wiring: Pre-installed 2 NO + 2 NC auxiliary contacts with a removable block provide immediate feedback and control functions for system integration.
• Space-Saving Design: Part of the compact SIRIUS modular system, offering high performance from a smaller footprint (Size S2).
• Worldwide Approval: IE3/IE4-ready and approved for global use (e.g., IEC, UL/CSA).

Function & Application

The 3RT2038-1NB34 functions as a main switching device in industrial automation and control systems. Its primary purpose is to safely and efficiently start, stop, and control 3-phase AC motors.

• Primary Function: Direct-On-Line (DOL) starting and switching of 3-phase AC motors.
• Suitable Applications: Pumps, Fans, Compressors, Conveyors, and various machine tool applications where motor control up to 37 kW is required.
• Compatibility: Seamlessly integrates with other Siemens SIRIUS devices, such as the 3RV2 motor starter protectors and 3RU2 thermal overload relays, to create complete, optimally coordinated load feeders.

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