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Siemens 3TF2040-0BB4 Size S0 3-Pole Contactor

Siemens 3TF2040-0BB4 Size S0 3-pole DC Contactor.

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ManufacturerSiemens

Part number3TF2040-0BB4

Size S0

Poles 3

AC-3 Rating 11 kW/400 V

Coil Voltage 24 V DC

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Size S0 3-pole AC-3 rated 11kW/400V 24V DC coil Screw terminals DC operation

Product description

The Siemens 3TF2040-0BB4 is a Size S0, 3-pole contactor designed for AC-3 applications, capable of switching 11 kW at 400 V. It operates with a 24 V DC coil and features standard screw terminals for its main connections. This contactor is built for DC operation. It is important to note that this product has been phased out, and its successors are found in the SIRIUS 3RT201 or 3TG10 series.

This contactor is suitable for a wide range of industrial applications, including the control of medium-sized motors, capacitor banks, and general power distribution. Its robustness and specific ratings make it a reliable choice for demanding environments found in manufacturing plants, water treatment facilities, and building automation systems.

Stanlo Automation, a veteran-owned business, understands the critical need for specific and often hard-to-find industrial parts. If your facility relies on the Siemens 3TF2040-0BB4, Stanlo Automation can help you secure these legacy components. We are dedicated to providing surplus and obsolete automation parts to keep your operations running smoothly.

Technical specifications

Size	S0
Poles	3
AC-3 Rating	11 kW/400 V
Coil Voltage	24 V DC
Terminals	Screw
Operation	DC
Features	Phased-out

Common applications

Motor control

Capacitor switching

Power distribution

Industrial automation

Manufacturing plants

Water treatment

Compatible systems

Motor starter assemblies Control circuits Industrial machinery

Also known as

Siemens 3TF2040-0BB4 Siemens Size S0 Contactor 3TF20400BB4

Replaces / compatible with

This is a phased-out product. The successor series is Siemens SIRIUS 3RT201 or 3TG10.

Technical note

Expert tip

This contactor is designed for DC operation; verify coil voltage and polarity carefully during installation. An appropriate overload relay must be used for motor protection.

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Frequently asked questions

What is the application rating for the Siemens 3TF2040-0BB4 contactor?

The Siemens 3TF2040-0BB4 is a Size S0, 3-pole contactor rated for AC-3 applications at 11 kW and 400 V. It operates on a 24 V DC coil and features screw terminals for easy connection.