3RT20182BB443MA0

The 3RT2018-2BB44-3MA0 is a Siemens SIRIUS S00 base contactor, AC-3 rated 16A, 7.5kW/400V, 24V DC standard coil, with built-in auxiliary contacts and coil suppression circuit, and features a spring terminal wiring design.

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Siemens 3RT2018-2BB44-3MA0 DC contactor, 24V DC, 16A

Product Positioning

The 3RT2018 belongs to the Siemens SIRIUS 3RT2 series and is a smaller S00 frame contactor than the 3RT2023. Its main circuit has an AC-3 rated current of 16A and can handle a 7.5kW/400V three-phase motor load. Compared to the 4kW rating of the 3RT2023, it is more suitable for direct starting applications of medium-sized motors. The 3RT2018-2BB44-3MA0 uses a 24V DC standard DC coil (BB code) and is permanently equipped with auxiliary contacts and coil suppression circuitry (-3MA0) at the factory. This integration eliminates the need for additional auxiliary contact modules or surge suppressors, making it suitable for control panel designs with limited space and simplified wiring requirements.

Core Product Advantages and Features

S00 Small Base

The S00 frame, which is more compact than the 3RT2023, is rated at 16A and 7.5kW/400V with AC-3, making it suitable for medium-sized three-phase motor applications.

24V DC standard coil

It adopts a 24V DC coil (BB series), which is suitable for DC control circuits or direct drive with PLC output.

Built-in auxiliary contacts and suppression circuits

The -3MA0 code indicates that auxiliary contacts and coil suppression circuitry are permanently integrated at the factory, simplifying wiring and reducing surge interference.

Spring terminal quick wiring

The spring-loaded terminal design allows for quick crimping without screws during wiring, making it suitable for automated control panels with large-scale wiring requirements.

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	Spring-type terminals

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