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Siemens 3RT2038-1KB44-3MA0 80A DC Contactor, 24V DC Coil, 2NO+2NC Aux

Siemens 3RT2038-1KB44-3MA0 80A 3-pole DC coil contactor, 24V DC, 2NO+2NC aux.

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ManufacturerSiemens

Part number3RT2038-1KB44-3MA0

Type Power Contactor

Application AC-3e/AC-3

Current Rating 80 A

Power 37 kW / 400 V

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AC-3e/AC-3 rated 80A current capacity 37kW power handling 24V DC coil Integrated varistor 2 NO + 2 NC auxiliary contacts PLC output compatible

Product description

The Siemens 3RT2038-1KB44-3MA0 is a high-performance 3-pole power contactor rated for AC-3e/AC-3 applications, capable of handling 80A and 37kW at 400V. This variant features a 24V DC coil, making it suitable for direct control from PLC outputs or low-voltage DC control systems. It includes an integrated varistor for surge suppression and a captive, removable auxiliary switch block providing 2 normally open (NO) and 2 normally closed (NC) contacts for comprehensive control and feedback. The size S2 contactor uses screw terminals and is designed for PLC output compatibility.

This contactor is ideal for applications requiring precise DC-controlled switching of AC loads, commonly found in modern automation systems, robotics, and specialized machinery where PLCs are prevalent. Its integrated features reduce the need for external components.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 3RT2038-1KB44-3MA0. We provide access to essential components that keep your automation systems running efficiently. Choose Stanlo Automation for reliable sourcing and dedicated support for your Siemens parts.

Technical specifications

Type	Power Contactor
Application	AC-3e/AC-3
Current Rating	80 A
Power	37 kW / 400 V
Poles	3
Coil Voltage	24 V DC (0.8-1.2* Uc)
Integrated Varistor	Yes
Auxiliary Contacts	2 NO + 2 NC
Captive Auxiliary Switch	Yes
Size	S2

Common applications

PLC control

Motor control

Industrial automation

Robotics

Machine building

Control panels

DC-powered systems

Compatible systems

PLCs with 24V DC digital outputs, 0.8-1.2* Uc control voltage range.

Also known as

Siemens 3RT2038-1KB44-3MA0 Contactor Siemens DC Coil Contactor 3RT2 Series PLC Contactor

Replaces / compatible with

Designed for direct integration with PLC outputs, this contactor is a modern replacement for older contactors in similar AC-3e/AC-3 applications needing DC coil control.

Technical note

Expert tip

The integrated varistor helps protect sensitive PLC output modules from voltage spikes generated when the contactor coil de-energizes, ensuring system longevity.

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Frequently asked questions

Is the Siemens 3RT2038-1KB44-3MA0 suitable for direct connection to PLC outputs?

Yes, the 3RT2038-1KB44-3MA0 is specifically designed with a 24V DC coil and integrated varistor to be suitable for direct connection to many PLC digital outputs, simplifying integration into automated systems.