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.

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Siemens SIRIUS 3RA1963-2A forward and reverse contactor busbar assembly physical drawing

Product Positioning

The 3RA1963-2A is a busbar connection group from the Siemens SIRIUS series for S10 forward and reverse starters. It connects the incoming and outgoing sides of two 3RT1.6 contactors via a busbar and performs phase sequence conversion on the output side.

Core Product Advantages and Features

bidirectional connection on the incoming and outgoing lines

Simultaneously handle the wiring on the contactor's input and output sides, and complete the phase sequence conversion on the output side.

Busbar main circuit

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

Corresponding to S10 contactor specifications

The hole spacing and shape are specifically designed for the 3RT1.6 type contactor, ensuring a high degree of fit during installation.

project	Specification
Product Type	Forward and reverse (reversible) starter bus connection group
Applicable size	S10
Applicable contactors	2 x 3RT1.6 type contactors
Number of poles in main circuit	3 poles
Connection method	Busbar (busbar) type connection
Function	Input/output side connection, output side phase sequence conversion
weight	Approximately 5.39 pounds (about 2.44 kilograms)
External dimensions	Approximately 10.827 x 4.606 x 2.165 inches
Product Series	SIRIUS 3RA19

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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.

3RA1962-2A

The Siemens SIRIUS 3RA1962-2A is a dedicated mounting base for reversible (rotational) starters. It can fix two S10 size 3RT1.6 contactors side by side on the same base, which facilitates the assembly of reversible motor starter circuits. It is usually combined with a busbar assembly (such as 3RA1963-2A) and a mechanical interlock to form a complete device.

3RA1954-2A

The Siemens SIRIUS 3RA1954-2A is a cross-size mechanical interlock that can be installed between 3RT10, 3RT12, and 3RT14 series contactors of sizes S6, S10, and S12. It prevents two contactors from engaging simultaneously through a mechanical structure and is commonly used in forward and reverse motor starting circuits as a safety backup mechanism in addition to electrical interlocking.