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Siemens 3RT1025-1XB40-0LA2 Traction Contactor

Siemens 3RT1025-1XB40-0LA2 3-pole traction contactor

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ManufacturerSiemens

Part number3RT1025-1XB40-0LA2

Manufacturer Siemens

Part Number 3RT1025-1XB40-0LA2

Type Traction Contactor

Poles 3

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3-pole configuration AC-3 rating 7.5 kW power 24V DC coil Electronic control unit Integrated varistor Size S0 Traction applications

Product description

The Siemens 3RT1025-1XB40-0LA2 is a specialized 3-pole power contactor designed for traction applications. Rated for AC-3 duty at 17A and 7.5 kW (400V), it features a 24V DC coil with an electronic control unit for optimized operation and an integrated varistor for surge suppression. This Size S0 unit uses screw terminals.

This contactor is engineered for the demanding environments of railway, mass transit, and other heavy-duty mobile applications where reliable DC power switching and protection are critical. Its robust design and integrated features ensure performance under vibration and electrical transients.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation components, offers the Siemens 3RT1025-1XB40-0LA2. We provide specialized parts for critical applications, ensuring availability and value for your demanding projects in the transportation and heavy industry sectors.

Technical specifications

Manufacturer	Siemens
Part Number	3RT1025-1XB40-0LA2
Type	Traction Contactor
Poles	3
Rated Current AC-3	17 A
Rated Power AC-3	7.5 kW @ 400 V
Coil Voltage	24 V DC
Control Unit	Electronic
Protection	Integrated Varistor
Size	S0
Terminal Type	Screw

Common applications

Traction control

Railway systems

Mass transit

Heavy-duty mobile equipment

Industrial automation

DC power switching

Compatible systems

Designed for DC control systems in railway and heavy-duty mobile applications, compatible with 24V DC power supplies common in these sectors.

Also known as

Siemens 3RT1025-1XB40-0LA2, SIRIUS 3RT1025, Siemens Traction Contactor, 24V DC Traction Contactor

Replaces / compatible with

This product is phased out. The preferred successor is the Siemens SIRIUS 3RT2018-2XB42-0LA2.

Technical note

Expert tip

The electronic control unit on the 3RT1025-1XB40-0LA2 allows for a wider control voltage range (0.7-1.25*Us) and provides consistent switching performance in demanding traction environments.

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Frequently asked questions

What is the purpose of the integrated varistor in the Siemens 3RT1025-1XB40-0LA2?

The integrated varistor in the Siemens 3RT1025-1XB40-0LA2 serves to suppress voltage spikes and transients that can occur in DC circuits, particularly in traction applications. This protects sensitive control electronics and extends the lifespan of the contactor.