3RA1973-2A

The Siemens SIRIUS 3RA1973-2A is a busbar connection assembly required for S12 size forward and reverse (reversible) starters. It can connect two 3RT1.7 type contactors in a busbar manner to form a forward and reverse circuit, replacing the traditional loose wiring method. It is quick to install and the circuit is neat. It is suitable for use with base plates and mechanical interlocks.

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Siemens SIRIUS 3RA1973-2A forward and reverse contactor busbar assembly physical drawing

Product Positioning

The 3RA1973-2A is a busbar connection group from the Siemens SIRIUS series for S12 forward and reverse starters. It connects the main circuits of two 3RT1.7 contactors via a busbar and is usually paired with a base plate and mechanical interlock to form a complete forward and reverse starting device.

Core Product Advantages and Features

Busbar main circuit connection

Replacing loose conductors with pre-formed busbars reduces wiring errors and shortens assembly time.

Corresponding to S12 contactor specifications

The hole spacing and shape are specifically designed for the 3RT1.7 type contactor, ensuring a high degree of fit during installation.

Combined with the base plate to form a complete circuit

When used with the 3RA1972 series base plate and mechanical interlock, it can form a standard forward and reverse starting device.

project	Specification
Product Type	Forward and reverse (reversible) starter bus connection group
Applicable size	S12
Applicable contactors	2 x 3RT1.7 type contactors
Connection method	Busbar (busbar) type connection
use	Form a forward and reverse (reversible) motor starting circuit
Matching components	A separate base plate (such as 3RA1972-2A) and mechanical interlocking device are required.
Origin	Germany
Product Series	SIRIUS 3RA19

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3RA1973-2B

The Siemens SIRIUS 3RA1973-2B is a dedicated wiring harness for S12 size star-delta (YD) starters. It includes a connector and fixing screws for connecting delta contactors and star contactors (both 3RT1.7 type). It features output phase sequence conversion and neutral bridging functions, busbar connection, and weighs approximately 2.098 kg.

3RA1972-2F

The Siemens SIRIUS 3RA1972-2F is a dedicated mounting base for star-delta (YD) starters. It can accommodate three 3RT1 series contactors side by side, forming a combination structure of main contactor, delta contactor and star contactor. This allows users to easily assemble star-delta starting circuits according to site requirements. The installation is simple and the structure is stable.

3RA1972-2E

The Siemens SIRIUS 3RA1972-2E is a mounting base for star-delta (YD) starters. It is designed for combinations of three contactors of mixed sizes (S12, S12, and S10). The main contactor and delta contactor are S12 size, while the star contactor is the smaller S10 size. It is suitable for applications with high motor power but low star circuit current.