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.
Product Positioning
The 3RA1973-2B is a wiring kit for Siemens SIRIUS series S12 size star-delta starters. It is used to connect two 3RT1.7 contactors and complete the output phase sequence conversion, saving the need for on-site busbar cutting.
Core Product Advantages and Features
Designed specifically for S12 star-delta
The dimensions and hole positions correspond to the 3RT1.7 type contactor, requiring no additional machining during installation.
Includes phase sequence conversion function
The output phase sequence has been adjusted at the factory to ensure the correct switching direction between star and delta configurations.
Neutral bridging busbar
The kit includes a neutral bridge busbar, simplifying bridging wiring for delta connections.
Busbar connection method
Using a busbar connection method, the main circuit connection can be completed without the need for a terminal box.
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The Siemens SIRIUS 3RA2316-8XB30-2BB4 is a pre-assembled reversible contactor assembly consisting of two 3RT2016 contactors and an interlocking kit. It has a rated current of 9A, an output of 4kW at 400V, a control voltage of 24VDC, and an IP20 protection rating, making it suitable for use in forward and reverse motor circuits.
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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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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.