3RA2943-2BB1

The Siemens 3RA2943-2BB1 is a star-delta (Y-Δ) wiring kit from the SIRIUS 3RA29 series. It is suitable for combinations of S3-sized main contactors, delta contactors, and star contactors. It provides two sets of wiring modules, upper and lower, and completes the power wiring between the three contactors with screw terminals. It is often used with 3RT2 series contactors.

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Siemens 3RA2943-2BB1 SIRIUS Star-Delta Wiring Kit S3

Product Positioning

The 3RA2943-2BB1 is also an electrical wiring kit for star-delta reduced voltage starting, but it uses an S3 size combination for the three contactors (main, delta, and star), which differs from the 2C model which uses different sizes. The kit is divided into upper and lower modules, with wiring completed using screw terminals, making it easy for technicians to select the correct kit according to specifications.

Core Product Advantages and Features

Dedicated for three S3 contactors

When the main/delta/star contactors are all S3 size, the corresponding contactor should be used.

Modular wiring between upper and lower sections

The kit consists of two sets of wiring modules, upper and lower, which are installed according to the installation location.

Screw terminal wiring

All wiring terminals use screw terminals for easy on-site installation and maintenance.

Paired with SIRIUS 3RT2 series

It can be combined with a 3RT2 contactor of the corresponding size to form a complete star-delta starter.

Complementary to 2C models

Different kit models correspond to different sizes of the three contactors.

project	Specification
Product Type	Star-delta (Y-Δ) electrical wiring kit
Applicable size combinations	The main/triangle/star shapes are all S3.
Applicable series	SIRIUS 3RT2 contactor
Wiring method	Screw terminals

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