Gold Series — Star DeltaThree Phase Motor Starter · Fully Automatic
Get Best Price- Model Type
- Gold Series — Star Delta · Three Phase Motor Starter
- Operation
- Fully Automatic · Remote trip without MCB/MCCB for industrial use
- Rating Range
- 7.5 HP - 60 HP
- Best Suited For
- Star Delta · Remote Trip
Adds Remote Trip functionality without MCB/MCCB for industrial and commercial use.
What is Gold Series — Star Delta?
Gold Series — Star Delta is a fully automatic three phase motor starter panel from Subtech (S S Power System), covering 7.5 HP to 60 HP. It is part of Subtech's motor control solutions range and is commonly used for induction motors, pumps, compressors and other industrial and agricultural machinery. Protection features include single phasing, reverse phasing, phase unbalance cutoff, over voltage protection, under voltage protection, overload protection, short circuit protection, dry run protection (optional).
Key Specifications at a Glance
Quick reference before you scroll through the full spec sheet
Why Choose Gold Series — Star Delta?
What actually matters when you put this on your line
Reduced Starting Current
Star-Delta switching lowers inrush current at start-up, protecting windings, cabling and upstream breakers.
Digital Monitoring
A digital display and settings make it easier to read status and adjust cut-offs without repeatedly opening the panel.
External Command Support
Can be started, stopped or tripped from a remote signal — useful for SCADA, BMS or level-controller integration.
Multiple Motor Protections
Built-in protection against single phasing, reverse phasing, phase unbalance cutoff, over voltage protection reduces avoidable motor failures.
Wide HP Range
Covers 7.5 - 60 HP, so one series can standardise across multiple motor sizes on site.
Built for Industrial & Pump Applications
Designed for the duty cycles seen in pumps, compressors, HVAC systems and general industrial motor loads.
Custom Panel Manufacturing Support
Subtech can adapt enclosure size, ratings and add-ons to project-specific requirements on request.
Rust-Resistant, Field-Ready Enclosure
Powder-coated GI/GPSP enclosures are built for Indian site conditions — dusty factory floors, outdoor pump houses and agricultural sheds alike.
How Gold Series — Star Delta Works
Step-by-step operating sequence
- 1
Motor Starts in Star Connection
On the start command, the contactor connects the motor windings in Star, limiting inrush current.
- 2
Starting Current Is Reduced
The Star connection drops the line current to roughly a third of a direct-on-line start, reducing stress on the motor and supply.
- 3
Timer/Control Logic Monitors the Transition
An internal timer (or digital control logic on automatic models) tracks how long the motor has been running in Star.
- 4
Starter Switches to Delta Connection
Once the motor has picked up speed, the panel switches the winding connection to Delta for full running torque.
- 5
Motor Runs at Full Load
In Delta, the motor receives full line voltage across each winding and runs at rated output.
- 6
Protection System Monitors Faults Continuously
Single phasing, reverse phasing, voltage and overload protection continue monitoring the motor throughout the run.
How to Select the Correct Model
Match your motor's HP rating to the correct reference number
| HP | Ref. No. | kW | Relay Range (A) | Protection | Size (mm) | MRP |
|---|---|---|---|---|---|---|
| 7.5 HP | SDG7 | 5.5 | 10-25 | — | 350*300*125 | ₹24,100 |
| 10 HP | SDG10 | 7.5 | 15-35 | — | 350*300*125 | ₹24,100 |
| 15 HP | SDG15 | 11 | 20-45 | — | 350*300*125 | ₹24,900 |
| 20 HP | SDG20 | 15 | 25-50 | — | 350*300*125 | ₹24,900 |
| 25 HP | SDG25 | 18.5 | 30-55 | — | 350*300*125 | ₹33,600 |
| 30 HP | SDG30L | 22 | 40-75 | — | 350*300*125 | ₹33,600 |
| 30 HP | SDG30 | 22 | 40-75 | — | 350*300*125 | ₹49,300 |
| 40 HP | SDG40 | 30 | 60-90 | — | 450*500*170 | ₹51,700 |
| 50 HP | SDG50 | 37 | 70-120 | — | 450*500*170 | ₹65,400 |
| 60 HP | SDG60 | 45 | 80-140 | — | 450*500*170 | ₹65,400 |
Common Problems This Solves
Real failure modes on the motor side, and how this panel prevents them
High Starting Current
Star-Delta switching reduces inrush current at start-up compared to a direct-on-line start, easing stress on the motor, cabling and upstream breakers.
Motor Overheating
Sustained overload, phase and voltage faults raise winding temperature over time; the panel's built-in protections cut power before heat damages the insulation.
Single Phasing
Detects the loss of any one phase and cuts power before the motor overheats or burns its windings.
Reverse Phase Sequence
Checks phase sequence before allowing the motor to start, preventing motors and pumps from running backward.
Voltage/Phase Imbalance
Trips the motor when the three phases drift too far apart in voltage, which otherwise causes uneven heating in the windings.
Over-Voltage Spikes
Cuts power when supply voltage rises above the safe band, protecting insulation and electronics.
Under-Voltage / Low Supply
Cuts power when voltage drops too low, preventing the motor from drawing excess current to compensate.
Motor Overload
Monitors running current and trips before sustained overload can overheat the motor.
Short Circuit / Wiring Fault
MCB/MCCB protection isolates the circuit immediately on a short circuit, protecting the panel and wiring.
Dry Running (Pump Losing Prime)
Optional dry-run protection stops the motor when there's no load/flow, preventing pump damage from running dry.
Frequent Tripping From Wrong Model Selection
Use the selection guide above to match your motor's HP and relay range to the correct reference number — an undersized relay setting is a common cause of nuisance tripping.
Description▾
Adds Remote Trip functionality without MCB/MCCB for industrial and commercial use.
Additional Information▾
- Wide operating Voltage range: 240-480 VAC
- Continuous running capacity: 100+ hrs
- Status: R-Y-B Phases, Healthy Power, Run Hr.
- Faults: Phase fail, Reverse Phase, Unbalance Voltage, Over/Under Voltage, Overload
- PMC Contactor for smooth, fast switching (5 years warranty on contactor coil against burning)
- Body: Rust-free GPSP Sheet, Wall mounting, compact size
- Heavy duty DMC connection terminals for input and output
- Remote Trip provision & programmable protections
- Site settable overload cut-off (by knob)
- Smart digital display interface
- Heavy Duty DMC Power Terminal
Models & Pricing
10 models| Ref. No. | HP | kW | Relay Range (A) | Size (mm) | Wt. (kg) | MRP | Std. Pack |
|---|---|---|---|---|---|---|---|
| SDG7 | 7.5 | 5.5 | 10-25 | 350*300*125 | 5.5 | ₹24,100 | 6 |
| SDG10 | 10 | 7.5 | 15-35 | 350*300*125 | 5.5 | ₹24,100 | 6 |
| SDG15 | 15 | 11 | 20-45 | 350*300*125 | 5.5 | ₹24,900 | 6 |
| SDG20 | 20 | 15 | 25-50 | 350*300*125 | 6.0 | ₹24,900 | 6 |
| SDG25 | 25 | 18.5 | 30-55 | 350*300*125 | 6.0 | ₹33,600 | 5 |
| SDG30L | 30 | 22 | 40-75 | 350*300*125 | 6.0 | ₹33,600 | 5 |
| SDG30 | 30 | 22 | 40-75 | 350*300*125 | 6.0 | ₹49,300 | 3 |
| SDG40 | 40 | 30 | 60-90 | 450*500*170 | 9.0 | ₹51,700 | 3 |
| SDG50 | 50 | 37 | 70-120 | 450*500*170 | 15.0 | ₹65,400 | 3 |
| SDG60 | 60 | 45 | 80-140 | 450*500*170 | 15.0 | ₹65,400 | 3 |
Protections
- Single Phasing
- Reverse Phasing
- Phase Unbalance Cutoff
- Over Voltage Protection
- Under Voltage Protection
- Overload Protection
- Short Circuit Protection
- Dry Run Protection (Optional)
Add-ons
- Dry Run Charges: ₹890 charged extra
- Double tank operation: ₹1400 charged extra
- Sensor Set: ₹1380 charged extra
Who Should Buy Gold Series — Star Delta?
This product is ideal for the following users and industries
Industrial Units & Factories
Manufacturing plants, processing units, and industrial facilities requiring reliable motor control and automation solutions.
Agricultural & Farming
Farmers and agricultural businesses using water pumps, irrigation systems, and motor-driven equipment for daily operations.
Contractors & Builders
Electrical contractors, panel builders, and construction professionals who need dependable motor starting solutions.
Commercial Establishments
Hotels, hospitals, offices, and commercial buildings with HVAC, lift, and pump motor control requirements.
Applications & Use Cases
Where you can use Gold Series — Star Delta effectively
Water Pump Motor Control
Submersible, centrifugal, and booster pump motor starting, protection, and automation for residential and commercial use.
Compressor & HVAC Systems
Air compressors, chillers, and HVAC blower motor control in factories, commercial buildings, and cold storage units.
Conveyor & Material Handling
Belt conveyors, rollers, and material handling equipment motors used in manufacturing and logistics.
Irrigation & Agriculture
Drip irrigation, sprinkler systems, and tube well motors for farms and agricultural land management.
Generator & ATS Panels
Auto transfer switch panels and generator motor control for seamless power backup solutions.
CNC & Machine Tools
Lathe machines, drilling machines, and CNC equipment requiring precise motor starting and protection.
Frequently Asked Questions
Common questions about Gold Series — Star Delta
What is the warranty on Gold Series — Star Delta?▾
Subtech provides a standard manufacturer warranty on this product. Warranty terms may vary based on the specific model and configuration. Contact our sales team for detailed warranty information.
Can I get a customized version of Gold Series — Star Delta?▾
Yes, Subtech specializes in custom panel manufacturing. We can modify specifications, ratings, enclosure types, and features as per your specific requirements. Share your needs through the quote form above.
What is the delivery time?▾
Standard models are typically available within 3-5 working days. Customized configurations may take 7-15 working days depending on complexity. We deliver across India.
Is installation support available?▾
Yes, Subtech provides installation guidance and technical support. For bulk orders, on-site commissioning support is also available. Our service team can assist with wiring diagrams and configuration.
Can I buy this product in bulk for my project?▾
Absolutely. We offer competitive bulk pricing for dealers, distributors, contractors, and project orders. Request a quote with your quantity for the best price.
Gold Series — Star Delta vs Conventional Star Delta Starter
See exactly what the automation adds over a conventional starter
| Feature | Gold Series — Star Delta | Conventional Starter |
|---|---|---|
| Operation | Fully automatic, digital soft-switch settings | Manual or basic electromechanical timer relay |
| Protection | 8 built-in protections | Typically overload/MCB protection only |
| Automation | Yes — timer/control logic manages the full start sequence | Manual timer relay, no digital control logic |
| External Command | Supported | Not supported |
| Display / Monitoring | Digital display | Analog meters or none |
| Phase Failure Protection | Included | Usually not included |
| Reverse Phase Protection | Included | Usually not included |
| Voltage Monitoring | Over/under voltage cutoff | Usually not included |
| Dry Run Protection | Available as an add-on | Not available |
| Maintenance | Low — solid-state switching, PMC contactor | Higher — mechanical timer relay wears over time |
| Customization | Subtech offers custom panel manufacturing on request | Typically fixed configuration |
Downloads
Technical documentation for this model
Related Products
Applicable Standards & Design Considerations
- IEC/IS 60947: Low-voltage switchgear and controlgear — general design reference for contactors, starters and protective devices, where applicable to the components used.
- IS/IEC 60529: Enclosure ingress protection (IP) ratings — referenced for enclosure design where an IP rating is specified for a given model.