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Siemens 3RT2018-2FB42 16A Contactor – 24V DC Coil, Integrated Diode

Siemens 3RT2018-2FB42 16A Power Contactor with 24V DC coil and integrated diode.

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ManufacturerSiemens

Part number3RT2018-2FB42

Type Power Contactor

AC-3e/AC-3 Rating 16A

Power 7.5 kW / 400 V

Poles 3

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AC-3e/AC-3 rated 16A current 7.5kW power 24V DC coil Integrated diode for suppression 1 NC auxiliary contact Size S00

Product description

The Siemens 3RT2018-2FB42 is a 3-pole power contactor rated for AC-3e/AC-3 applications, with a 16A current rating and 7.5 kW power at 400V. This model utilizes a 24V DC coil and features an integrated diode for coil protection and faster response times. It is equipped with one normally closed (NC) auxiliary contact and uses spring-loaded terminals in size S00.

This contactor is suitable for motor control and switching tasks in industrial automation, particularly where DC control circuits benefit from the rapid switching and suppression provided by the integrated diode.

Stanlo Automation, a veteran-owned distributor, is your reliable source for surplus industrial parts, including the Siemens 3RT2018-2FB42. We are committed to providing quality components and excellent service to support your operational needs.

Technical specifications

Type	Power Contactor
AC-3e/AC-3 Rating	16A
Power	7.5 kW / 400 V
Poles	3
Coil Voltage	24 V DC
Integrated Diode	Yes
Auxiliary Contacts	1 NC
Terminals	Spring-loaded
Size	S00

Common applications

Motor control

Industrial automation

DC control circuits

Status feedback

Fast switching

Compatible systems

Compatible with Siemens 3RH21 auxiliary contact blocks, ensuring flexibility in configuring auxiliary contacts.

Also known as

Siemens 3RT2018 NC Contactor Siemens S00 DC Contactor Diode 3RT2018-2FB42

Replaces / compatible with

This contactor is designed for use in applications needing a 24V DC coil with integrated suppression and a normally closed auxiliary contact, replacing similar 3RT20 models.

Technical note

Expert tip

Ensure the correct DC voltage (24V DC) is applied to the coil; using AC voltage will damage the coil and integrated electronics.

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Frequently asked questions

What type of auxiliary contact is included with the Siemens 3RT2018-2FB42?

The Siemens 3RT2018-2FB42 power contactor is equipped with one normally closed (NC) auxiliary contact. This is useful for signaling or interlocking circuits where a closed circuit indicates the main contacts are open.