Siemens 3RA1954-2G Connector Module for Star-Delta (YD) Combination SIRIUS S6-S6-S3 Contactor Assembly Original Brand New

Overview

The Siemens 3RA1954-2G Connector Module is a crucial accessory within the SIRIUS modular system, specifically engineered for creating star-delta (wye-delta or YD) contactor combinations. This pre-wired module simplifies the assembly of three contactors, significantly reducing wiring time and minimizing potential wiring errors in complex motor starting applications.

It is designed to connect three specific contactors: two size S6 contactors (3RT1.5 series) and one size S3 contactor (3RT2.4 series), adhering to the configuration S6-S6-S3 required for large star-delta starters.

Key Benefits

• Time-Saving Installation: Rapid, error-free assembly of star-delta combinations thanks to the pre-wired module design.
• High Reliability: Ensures correct electrical and mechanical connection between the three required contactors.
• Space Optimization: Creates a compact, professional-looking contactor assembly, ideal for control cabinet installations.
• System Integration: Seamlessly integrates with the modular Siemens SIRIUS series, guaranteeing component compatibility.
• Reduced Wiring Errors: Eliminates the need for manual, complex control wiring between contactors for the YD function.

Function

This module acts as a specialized wiring and mechanical connector for the three contactors necessary to form a star-delta starter. It mechanically and electrically links the two main contactors (Star and Delta, both 3RT1.5, Size S6) with the star-point contactor (3RT2.4, Size S3). This connection is vital for sequencing the switching operations required to start a motor in a reduced-voltage star configuration before switching to a full-voltage delta configuration.

Application

Primarily used in three-phase motor control applications where a reduced starting current is necessary, such as:

• Pumps and Compressors
• Ventilation and Air Conditioning Systems
• Conveyor Systems and Material Handling
• Large Machinery where direct-on-line starting current is too high.

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