If you are looking for star delta starter used up to how much hp the your at right place, A Star-Delta Starter is typically used for induction motors ranging from 5 HP to 150 HP (3.7 kW to 110 kW).
Here’s a detailed breakdown 👇
General Range of Use:
| Motor Power (HP) | Motor Power (kW) | Common Application |
|---|---|---|
| 5 – 10 HP | 3.7 – 7.5 kW | Small industrial motors |
| 10 – 50 HP | 7.5 – 37 kW | Medium pumps, compressors, conveyors |
| 50 – 150 HP | 37 – 110 kW | Large pumps, blowers, crushers |
Key Point:
- Minimum: Usually above 5 HP, because smaller motors don’t need reduced starting current (they can start directly on DOL starters).
- Maximum: Practically up to 150 HP (110 kW), since for larger motors, auto-transformer starters or soft starters/VFDs are preferred for better control and efficiency.
Reason for Limitation:
- The star-delta method reduces starting current to about 1/3 of the direct-on-line current.
- However, it only works if the motor’s stator winding terminals are accessible (6 terminals) and the motor is designed for star-delta starting (Δ/Υ rated).
In short:
Star Delta Starters are commonly used for motors from 5 HP up to 150 HP (3.7 kW to 110 kW).
Would you like me to include a chart showing the HP–kW–current relationship for star-delta starters? It looks great in blog posts or reports.