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Siemens 3RT2028-2FB40 Contactor - 24V DC, Diode Combination

Siemens 3RT2028-2FB40 Power Contactor, 38A, 24V DC coil, diode combination.

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ManufacturerSiemens

Part number3RT2028-2FB40

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 Integrated diode combination for coil protection 1 NO + 1 NC auxiliary contacts Spring-loaded terminals Size S0

Product description

The Siemens 3RT2028-2FB40 is a 3-pole power contactor suitable for AC-3e/AC-3 applications, rated for 38 A and 18.5 kW at 400 V. It features a 24 V DC coil and incorporates a plugged-in diode combination for coil protection and reduced holding current. This S0-sized contactor includes 1 normally open (NO) and 1 normally closed (NC) auxiliary contact set and uses spring-loaded terminals for easy and secure wiring.

This power contactor is designed for applications requiring efficient coil commutation and protection, such as in motor control circuits, automation systems, and machinery where DC control voltages are used. The integrated diode combination offers benefits in terms of reduced backlash and improved switching performance.

Stanlo Automation, a veteran-owned surplus parts distributor, proudly offers the Siemens 3RT2028-2FB40. We are committed to providing reliable, high-quality industrial automation components at competitive prices, ensuring you have access to the parts needed to keep your operations running efficiently.

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	1 NO + 1 NC
Coil Protection	Plugged-in diode combination
Terminals	Spring-loaded
Size	S0

Common applications

Motor control

Industrial automation

Control panels

Machinery

Automation systems

DC controlled circuits

Compatible systems

Siemens Sirius 3RT series DC control circuits Motor starter applications

Also known as

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

Replaces / compatible with

This contactor can replace other Siemens 3RT2028 series contactors. The integrated diode combination simplifies wiring and improves coil protection.

Technical note

Expert tip

The diode combination on the 3RT2028-2FB40 provides effective coil suppression, allowing for direct integration into DC control circuits without external suppression components.

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Frequently asked questions

What is the benefit of the diode combination in the Siemens 3RT2028-2FB40?

The plugged-in diode combination in the Siemens 3RT2028-2FB40 protects the coil from voltage spikes during switching and reduces the holding current, improving energy efficiency and contactor lifespan.