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Siemens 3RA2425-8XF32-1BB4 Star-Delta Contactor Assembly

Siemens 3RA2425-8XF32-1BB4 3-pole Star-Delta Contactor Assembly

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ManufacturerSiemens

Part number3RA2425-8XF32-1BB4

Type Star-Delta Contactor Assembly

AC-3 Rating 15 kW / 18.5 kW (20 HP / 25 HP) / 400 V

Poles 3

Coil Voltage 24 V DC

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Star-Delta Motor Starting Integrated Interlocks 3 NO + 3 NC Auxiliary Contacts Screw Terminals Size S0 24 V DC Coil

Product description

The Siemens 3RA2425-8XF32-1BB4 is a Size S0, 3-pole contactor assembly engineered for star-delta (wye-delta) motor starting. It is rated for AC-3 duty, supporting 15 kW (20 HP) to 18.5 kW (25 HP) at 400V. This assembly utilizes a 24 V DC coil and features screw terminals, along with integrated electrical and mechanical interlocks for safe operation. It includes 3 normally open (NO) and 3 normally closed (NC) auxiliary contacts.

This contactor assembly is essential for applications requiring reduced starting current, commonly found in industrial machinery, pumps, fans, and compressors that need smooth acceleration. Its use helps to protect the motor and power supply during startup.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 3RA2425-8XF32-1BB4. We ensure you get reliable components at competitive prices, backed by expert service.

Technical specifications

Type	Star-Delta Contactor Assembly
AC-3 Rating	15 kW / 18.5 kW (20 HP / 25 HP) / 400 V
Poles	3
Coil Voltage	24 V DC
Terminals	Screw
Interlock	Electrical and Mechanical (Integrated)
Auxiliary Contacts	3 NO + 3 NC
Size	S0

Common applications

Star-Delta Motor Control

Industrial Pumps

Fans

Compressors

Machine Tools

Automation Systems

Compatible systems

Motor control circuits PLC integrated systems Industrial automation solutions

Also known as

Siemens Sirius Star-Delta Starter 3RA2425 Contactor Siemens 15kW Wye-Delta Assembly

Replaces / compatible with

This integrated assembly simplifies star-delta starting configurations, often replacing the need for separate contactors, timers, and mechanical interlocks.

Technical note

Expert tip

This assembly requires a suitable star-delta timer to control the switching sequence between star and delta configurations.

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Frequently asked questions

What motor sizes can the Siemens 3RA2425-8XF32-1BB4 start using star-delta?

The Siemens 3RA2425-8XF32-1BB4 star-delta contactor assembly is suitable for AC-3 applications with motor ratings from 15 kW up to 18.5 kW (approximately 20 to 25 HP) at 400V.