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Siemens SIRIUS 3RT2038-1KB40 Power Contactor

Siemens SIRIUS 3RT2038-1KB40 3-Pole Power Contactor.

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ManufacturerSiemens

Part number3RT2038-1KB40

Rated Current (AC-3) 80 A

Rated Power (400V) 37 kW

Poles 3

Coil Voltage 24 V DC

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AC-3e/AC-3 Rating Integrated Varistor Suitable for PLC Outputs 1 NO + 1 NC Auxiliary Contacts SIRIUS Modular System Screw Terminals

Product description

The Siemens 3RT2038-1KB40 is a 3-pole power contactor from the SIRIUS 3RT series, designed for AC-3e/AC-3 applications. It is rated for 80 A at 400 V and has a power rating of 37 kW at 400 V. This contactor features a 24 V DC coil, an integrated varistor for surge suppression, and auxiliary contacts consisting of 1 normally open (NO) and 1 normally closed (NC) contact. It utilizes screw terminals and is frame size S2.

This contactor is suitable for direct connection to PLC outputs, making it ideal for motor control, switching auxiliary and control circuits, and other load management tasks in industrial automation. Its robust design and compliance with international standards (IEC, UL/CSA) ensure reliable operation in various environments.

Source your Siemens 3RT2038-1KB40 from Stanlo Automation, your veteran-owned surplus industrial parts distributor. We provide quality components to keep your operations running efficiently.

Technical specifications

Rated Current (AC-3)	80 A
Rated Power (400V)	37 kW
Poles	3
Coil Voltage	24 V DC
Auxiliary Contacts	1 NO + 1 NC
Frame Size	S2
Terminals	Screw

Common applications

Motor Starting and Control

Industrial Automation

Control Panel Building

Power Distribution

Machine Tool Control

Compatible systems

Compatible with Siemens S7-300/400 and other PLCs with 24V DC digital outputs.

Also known as

SIRIUS 3RT2038

Replaces / compatible with

This contactor replaces older Siemens 3RT1045-1BB40 models. It is part of the modular SIRIUS system.

Technical note

Expert tip

The integrated varistor provides surge protection, crucial for applications where the contactor is switched by electronic control signals.

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Frequently asked questions

Can the Siemens 3RT2038-1KB40 contactor be directly connected to PLC outputs?

Yes, the Siemens 3RT2038-1KB40 is specifically designed for direct connection to PLC outputs. Its coil rating and integrated features make it suitable for interfacing with electronic controllers.