3RA1972-2A

The Siemens SIRIUS 3RA1972-2A is a dedicated mounting base for reversible (rotational) starters. It can fix two S12 size 3RT1.7 contactors side by side on the same base, making it convenient for users to assemble reversible motor starter circuits. It is usually combined with a busbar assembly and mechanical interlock to form a complete device, with a net weight of approximately 2.322 kg.

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Solid image of the mounting base plate for the Siemens SIRIUS 3RA1972-2A forward and reverse contactor.

Product Positioning

The 3RA1972-2A is a mounting base plate for Siemens SIRIUS series reversible starters. It can fix two S12-sized 3RT1.7 contactors side by side and is one of the basic components for assembling reversible starters.

Core Product Advantages and Features

Dual contactors fixed side by side

The base plate can simultaneously mount two 3RT1.7 type contactors, corresponding to the required combinations for forward and reverse circuits.

The basic component of the complete device

A busbar assembly (such as 3RA1973-2A) and a mechanical interlock are required to form a complete forward and reverse starting device.

Metal structure is durable

The base plate has sufficient strength to support the long-term operation of the contactor.

project	Specification
Product Type	Forward and reverse (reversible) starter mounting base plate
Applicable size	S12
Applicable contactors	2 x 3RT1.7 type contactors
Assembly method	Two contactors are fixed side by side on the same base plate.
use	Form a forward and reverse (reversible) motor starting circuit
net weight	Approximately 2.322 kg
Origin	Germany
Product Series	SIRIUS 3RA19

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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.

3RA1963-2B

The Siemens SIRIUS 3RA1963-2B is a dedicated wiring harness for S10 size star-delta (YD) starters, used to connect delta contactors and star contactors (both 3RT1.6 type). It includes phase sequence conversion and neutral bridging functions, and the busbar connection eliminates the need for a terminal box. It weighs approximately 1.813 kg and is suitable for star-delta starting of small and medium power motors.

3RA1963-2A

The Siemens SIRIUS 3RA1963-2A is a bus connection group required for an S10 size forward and reverse (reversible) starter. It connects two 3RT1.6 type contactors to the input and output sides via a bus, and completes the phase sequence conversion on the output side. The main circuit is a 3-pole design, which is suitable for use with a base plate and mechanical interlock to form a complete circuit.