Star Delta Starters - Electrical, Lighting and Power
A star-delta starter is a reduced-voltage motor starter used for starting suitable three-phase squirrel-cage induction motors. It starts the motor in star connection and changes to delta after acceleration, reducing starting current and torque.
ProShipWorks provides end-to-end support to source and supply Star Delta Starters for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.
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Product Information
| Product Name | Star Delta Starters |
|---|---|
| Product Category | Electrical, Lighting and Power |
| Product Reference | 533 |
| Brands / Manufacturers | Schneider Electric, ABB, Siemens, Terasaki |
| Unit of Measure | Piece or Set |
Key Features
| Key Feature |
|---|
| 1. Reduced motor starting current |
| 2. Three-contactor star-delta switching arrangement |
| 3. Adjustable transition timer |
| 4. Thermal or electronic overload protection |
| 5. Electrical and mechanical interlocking |
Applications of Star Delta Starters
| Application |
|---|
| 1. Marine pumps and seawater cooling pumps |
| 2. Ventilation fans and engine-room machinery |
| 3. Compressors and other fixed-speed three-phase motors |
Models & Manufacturers
| Model | Manufacturer |
|---|---|
| TeSys Deca LC1D contactor series configured as a star-delta starter | Schneider Electric |
| AF contactor series configured as a star-delta starter | ABB |
| SIRIUS 3RT2 contactor series configured as a star-delta starter | Siemens |
Technical Specifications
| Model | Specification | Value | Unit |
|---|---|---|---|
| Typical star-delta starter | Motor type | Three-phase squirrel-cage induction motor with six accessible terminals | — |
| Typical star-delta starter | Starting connection | Star (Y) | — |
| Typical star-delta starter | Running connection | Delta (Δ) | — |
| Typical star-delta starter | Main switching devices | Three contactors with electrical and mechanical interlocking | — |
| Typical star-delta starter | Transition control | Adjustable star-delta timer | s |
| Typical star-delta starter | Overload protection | Thermal or electronic motor overload relay | — |
Standards, Certifications & Class Approval
Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.
| Applicable Standards & Certification | IEC 60947-4-1 is commonly applicable to low-voltage contactors and motor starters. Marine assemblies may additionally be designed and tested to IEC 60092 requirements, with exact standards dependent on vessel system voltage, installation, and classification project. |
|---|---|
| Class Approval | DNV, ABS, Lloyd's Register, Bureau Veritas, and ClassNK may accept or approve marine starter assemblies when the specific product, enclosure, installation, and project certification requirements are satisfied. Approval is not automatic for every configuration. |
Installation, Maintenance & Safety Information
| Installation Notes | Verify that the motor is suitable for star-delta starting and has six accessible terminals. Confirm motor voltage, phase sequence, contactor ratings, overload setting, control voltage, timer adjustment, interlocking, enclosure rating, and cable termination before energizing. |
|---|---|
| Maintenance Tips | Inspect contactor contacts, terminals, overload relay, timer, interlocks, and enclosure for wear, looseness, corrosion, heat damage, and moisture ingress. Test the transition sequence and insulation condition during planned maintenance. |
| Safety Notes | Isolate, lock out, and verify absence of voltage before work. Star-delta starters do not provide full starting torque and may be unsuitable for high-inertia or loaded starts. Use correctly rated marine components and follow vessel electrical procedures. |
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