3RT20181BB443MA0

The 3RT2018-1BB44-3MA0 is a Siemens SIRIUS S00 base contactor, AC-3 rated 16A, 7.5kW/400V, 24V DC standard coil, with built-in auxiliary contacts and suppression circuit, and uses screw terminal wiring.

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Siemens 3RT2018-1BB44-3MA0 DC contactor, 24V DC, 16A

Product Positioning

Both the 3RT2018-1BB44-3MA0 and 2BB44-3MA0 belong to the Siemens SIRIUS 3RT2018 series S00 frame contactor. The main circuit has an AC-3 rated current of 16A and can handle a 7.5kW/400V three-phase motor load. Both use a standard 24V DC coil (BB series). The difference lies in the terminal type—this part number is a screw terminal version, suitable for control panels accustomed to screw-locked wiring, facilitating easy verification of the locking status of each terminal during future maintenance. The auxiliary contacts and coil suppression circuit are also permanently integrated at the factory with the code -3MA0, reducing the need for additional installation on-site.

Core Product Advantages and Features

24V DC standard coil

It adopts a 24V DC standard DC coil (BB series), which is suitable for control circuits or PLC output points driven by DC power supply.

Screw terminal version

Compared to models with spring terminals, this model uses a screw terminal design, which facilitates point-by-point tightening inspection and conforms to traditional wiring habits.

Built-in auxiliary contacts and suppression circuits

The -3MA0 code indicates that the auxiliary contacts and coil suppression circuit have been permanently integrated at the factory, simplifying wiring and on-site installation.

S00 Small Base

The AC-3 is rated at 16A and 7.5kW/400V. Its frame is more compact than the 3RT2023, making it suitable for medium-sized motors and disks with limited space.

project	Specification
Rated usage category	AC-3
Rated current	16 A
Rated power	7.5 kW / 400V AC
Base size	S00
Number of poles/main contacts	3 poles, 3NO
Coil type	24V DC, standard DC coil (BB series)
Auxiliary contact	Built-in permanent auxiliary contact
Coil suppression circuit	Built-in (-3MA0 code, factory integration)
Terminal type	Screw terminals

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