Siemens 3RT2038-3AG20 Power Contactor, 80A, 37kW (AC-3e/AC-3), 110V AC Coil, Screw/Spring Terminals, SIRIUS Size S2 Original Brand New

Overview: Siemens 3RT2038-3AG20 Power Contactor

The Siemens 3RT2038-3AG20 is a high-performance, 3-pole SIRIUS 3RT2 Power Contactor designed for switching motors up to 37 kW (at 400 V) and general AC loads. As part of the modular SIRIUS system, this device offers reliable operation, a compact footprint, and a long mechanical service life of 10 million switching cycles.

This specific model features an operational current of 80 A (AC-3e/AC-3), a control supply voltage of 110 V AC (50/60 Hz), and includes an integrated set of auxiliary contacts (1 NO + 1 NC). It is engineered for modern industrial applications, providing flexible connection options with screw terminals for the main circuit and spring-loaded terminals for the control and auxiliary circuits, ensuring a fast, vibration-proof, and maintenance-free connection for the control wiring. The compact Size S2 design makes it a space-efficient solution for motor control applications.

Benefits & Advantages

• High Performance: Capable of switching motors up to 37 kW / 80 A, suitable for heavy-duty applications.
• Reliable Connection: Combination of screw terminals for robust main circuit connection and spring-loaded terminals for fast, secure, and vibration-proof auxiliary/control wiring.
• Space-Saving Design: Compact Size S2 form factor within the modular SIRIUS system.
• Integrated Auxiliary Contacts: Reduces complexity and wiring effort with built-in 1 NO + 1 NC contacts.
• Global Compliance: Approved for worldwide use (e.g., IEC and UL/CSA) and IE3/IE4-ready.

Function & Application

The Siemens 3RT2038-3AG20 Power Contactor is primarily used for switching 3-phase AC motors in industrial control and automation systems. Its function is to safely and reliably connect or disconnect electrical power to the motor or load circuit.

Typical Applications Include:

• Motor starting and stopping (DOL, Reversing combinations).
• Switching of heating loads, lighting, and capacitor banks.
• Integration into control panels, load feeders, and motor starter combinations.

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