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.
Product Positioning
The 3RA1954-2A is a mechanical interlocking device from the Siemens SIRIUS series that can be installed between S6, S10, and S12 size contactors. Through the interlocking design of the mechanism, it prevents two contactors in the forward and reverse circuits from engaging simultaneously, which would cause a short circuit.
Core Product Advantages and Features
Cross-size compatibility
A single model can be used with the 3RT10/3RT12/3RT14 series contactors of sizes S6, S10, and S12.
Mechanical safety backup
The mechanism interlocks to prevent two contactors from operating simultaneously, serving as an additional protection beyond the electrical interlocking circuit.
Easy to install
It can be directly clipped between two contactors without additional wiring.
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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.
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3RA1953-3G
The Siemens SIRIUS 3RA1953-3G is a dedicated connector for star-delta (YD) starters. It is used to connect the output side of an S6-size 3RT1.5 delta contactor to an S3-size 3RT2 star contactor. It is suitable for use with DC coil versions to form an S6-S6-S3 star-delta starting circuit.
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3RA1953-3D
The 3RA1953-3D is the top connection busbar (busbar) of the SIRIUS S6 size reverse starter assembly. It is used with the 3RT1.5 contactor to replace the traditional loose wire connection method, improve wiring efficiency and reliability, and is suitable for large motor forward and reverse control panels.