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Siemens 3RT2028-2BB44-3MA0 Contactor - 24V DC, 2 NO + 2 NC Aux

Siemens 3RT2028-2BB44-3MA0 Power Contactor, 38A, 24V DC, 2 NO + 2 NC aux.

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ManufacturerSiemens

Part number3RT2028-2BB44-3MA0

Type Power Contactor

Poles 3

AC-3e/AC-3 Rating 38 A

Power Rating 18.5 kW at 400 V

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38A switching capacity 24V DC coil Captive auxiliary switches (2 NO + 2 NC) Spring-loaded terminals Size S0 Designed for AC-3e/AC-3

Product description

The Siemens 3RT2028-2BB44-3MA0 is a robust 3-pole power contactor designed for AC-3e/AC-3 switching duties, capable of handling 38 A and 18.5 kW at 400 V. It operates with a 24 V DC coil and comes equipped with 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts, integrated as captive auxiliary switches. This S0-sized contactor features spring-loaded terminals for ease of installation and connection, and it is designed without a surge suppressor, allowing for retrofitting if needed.

This power contactor is ideal for motor control, load switching, and automation tasks across various industrial sectors including manufacturing plants, process control, and building management systems. Its enhanced auxiliary contact configuration (2 NO + 2 NC) provides greater flexibility for control circuit design and interlocking functions.

Stanlo Automation, a veteran-owned surplus parts distributor, is your source for the Siemens 3RT2028-2BB44-3MA0. We provide reliable, high-quality industrial automation components, ensuring that you can find the parts you need to maintain and upgrade your systems efficiently and affordably.

Technical specifications

Type	Power Contactor
Poles	3
AC-3e/AC-3 Rating	38 A
Power Rating	18.5 kW at 400 V
Coil Voltage	24 V DC
Auxiliary Contacts	2 NO + 2 NC (captive)
Terminals	Spring-loaded
Size	S0
Surge Suppressor	Not retrofittable

Common applications

Motor control centers

Industrial machinery

Automation systems

Control panels

Switchgear

Manufacturing

Process industries

Compatible systems

Siemens Sirius 3RT series Motor control circuits Automation control panels

Also known as

Siemens 3RT2028 Contactor 3RT2028 Series Contactor Siemens 38A Contactor 24V DC Sirius 3RT Contactor

Replaces / compatible with

This contactor can replace older Siemens contactors in the 3RT2028 series and is compatible with Siemens accessories for the Sirius 3RT range.

Technical note

Expert tip

The captive auxiliary switches offer enhanced reliability and simplified wiring compared to add-on auxiliary blocks.

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Frequently asked questions

What is the auxiliary contact configuration for the Siemens 3RT2028-2BB44-3MA0?

The Siemens 3RT2028-2BB44-3MA0 features integrated captive auxiliary switches with a configuration of 2 normally open (NO) and 2 normally closed (NC) contacts.