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Siemens 3RT2025-1FB40 Contactor with Diode — 17A 7.5kW 24V DC

Siemens 3RT2025-1FB40 3-pole power contactor with diode.

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ManufacturerSiemens

Part number3RT2025-1FB40

Type Power Contactor

AC-3e/AC-3 Rating 17A, 7.5kW @ 400V

Poles 3

Coil Voltage 24V DC

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AC-3e/AC-3 motor rating 3-pole configuration 1 NO + 1 NC auxiliary contacts 24V DC coil Plugged-in diode combination S0 frame size

Product description

The Siemens 3RT2025-1FB40 is a 3-pole power contactor designed for AC-3e/AC-3 applications, handling 17 A and 7.5 kW at 400 V. This S0-sized contactor features a 24 V DC coil and comes with a plugged-in diode combination for surge suppression. It is equipped with 1 NO + 1 NC auxiliary contacts and uses screw terminals for connection.

This contactor is suitable for motor control and automation tasks, particularly where DC control voltages are used and electrical noise needs to be minimized due to the integrated diode. The 1 NO + 1 NC auxiliary contacts provide basic signaling capabilities.

Stanlo Automation, a veteran-owned surplus parts distributor, proudly offers the Siemens 3RT2025-1FB40. We are dedicated to supplying high-quality industrial automation components to keep your operations efficient. Choose Stanlo for reliable surplus parts and exceptional service.

Technical specifications

Type	Power Contactor
AC-3e/AC-3 Rating	17A, 7.5kW @ 400V
Poles	3
Coil Voltage	24V DC
Auxiliary Contacts	1 NO + 1 NC
Terminal Type	Screw
Size	S0

Common applications

Motor control

Automation systems

Control panels

PLC output circuits

Industrial machinery

Power switching

Compatible systems

Control circuits with sensitive electronics Automation systems requiring DC coil operation Motor starter applications

Also known as

Siemens 3RT2025-1FB40 SIRIUS 3RT2025-1FB40 Siemens 17A DC Contactor with Diode

Replaces / compatible with

Ideal for applications requiring inherent surge suppression on the 24V DC coil. Compatible with Siemens SIRIUS 3RT2 system components.

Technical note

Expert tip

The integrated suppression diode means no external RC element or suppressor diode is needed, simplifying wiring and saving space in control cabinets.

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Frequently asked questions

What is the purpose of the plugged-in diode combination on the Siemens 3RT2025-1FB40?

The plugged-in diode combination on the Siemens 3RT2025-1FB40 acts as a suppressor for voltage peaks generated when the coil is de-energized. This protects sensitive electronic components in the control circuit from inductive kickback.