High performance 50Hp/ 85Hp star delta starter consists of 3 contactors and an air delay head. Left contactor is connected to main circuit inlet and outlet and the main contactor of the thermal overload relay. The others are forward reverse contactors. Perfect for circuit control of 3 phase induction motor.

Star Delta Starter Specification

• Model: CHN-QJX2-80
• Rated Operational Current (AC-3): 110A
• Coil Rated Voltage: 220V AC, 380V AC (Optional)
• Contact Form: 4P (4NO) or 4P (2NO+2NC) (Optional)
• Power of Controllable 3-phase Squirrel-cage Motor (AC-3): 220V, 37kW; 380V, 63kW
• Conventional Heating Current: 80A
• Rated Insulation Voltage: 690V
• Electric Life: 600 times/h
• Mechanical Life: 3600 times/h
• Matching Fusing Model: RT16-100
• Average Power Consumption (20℃) @ 50Hz: Pick-up 230VA; Holding 32A
• Rail Size: 75mm
• Ambient Temperature: -5℃~+40℃
• Altitude: ≤2000m
• Class of Pollution: Class 3
• Installation Category: Ⅲ
• Dimension (L*W*H): 143mm*310mm*196mm
• Weight: 5kg

Air Delay Head Specification

• Rated Current: 10A
• Delay Time: Power Off Time Delay 0.1~30s
• Dimension (L*W*H): 50mm*45mm*60mm
• Auxiliary Contact: 1NO+1NC

Dimension (Unit: mm)

Wiring Diagram

Tips: Why does a 3 phase asynchronous motor choose star-delta step-down starter?

The reason for choosing star-delta step-down starter is some motors with relatively large power (generally a single set of 7.5 kW or more) have a relatively large starting current when starting, which has a large impact on the power grid. Therefore, in order to reduce the starting current and reduce the impact on the power grid, generally Drop-down start will be used. Star-delta buck start is one of them, and the most common one. Star-delta step-down starting means that when starting, the stator winding is connected into a star (Y) to reduce the starting voltage and limit the starting current; after the motor starts, the stator winding is changed to a delta (△), so that the motor full pressure operation. When the motor starts, it is connected in a star shape. The starting voltage applied to the stator windings of each phase is only when the delta connection is used for direct starting. The starting current is 1/3 of that when the delta connection is directly used. 1/3 of the direct start.