9A Star Delta Starter, 4kW/ 7.5kW, 220V/ 380V AC

High performance wye delta connection 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 three phase 5.5Hp/ 10Hp asynchronous motor.

Star Delta Starter Specification

• Model: ATO-QJX2-09
• Rated Operational Current (AC-3): 9A
• Coil Rated Voltage: 220V AC, 380V AC (Optional)
• Contact Form: 3P+NO or 3P+NC (Optional)
• Power of Controllable 3-phase Squirrel-cage Motor (AC-3): 220V, 4kW; 380V, 7.5kW
• Conventional Heating Current: 20A
• Rated Insulation Voltage: 690V
• Electric Life: 1200 times/h
• Mechanical Life: 3600 times/h
• Matching Fusing Model: RT16-16
• Average Power Consumption (20℃) @ 50Hz: Pick-up 76VA; Holding 9.4VA
• Rail Size: 35mm
• Ambient Temperature: -5℃~+40℃
• Altitude: ≤2000m
• Class of Pollution: Class 3
• Installation Category: Ⅲ
• Dimension (L*W*H): 124mm*140mm*149mm
• Weight: 1.5kg

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: How does a start delta starter work?

Star delta starter is a starting method of asynchronous motors. Because the starting current of asynchronous motors is relatively large during the starting process, motors with large capacity can use "star-delta switching start". This is a simple step-down starting method. When starting, the stator winding is connected into a star shape, and then connected into a triangle after starting, which can reduce the starting current and reduce its impact on the power grid. Such a start-up method is called star-delta decompression start, referred to as star-delta start (Y-O start).

When using star delta starter, the starting current is only 1/3 of the original direct starting according to the delta connection. If the starting current in direct starting is calculated as 6~7Ie, then in star delta starter, the starting current is only 2~2.3 times. At the same time, the starting voltage is only one-third of the root sign of the original delta connection method when starting directly. When the load does not have strict requirements on the starting torque of the motor and the starting current of the motor must be limited and the motor meets the 380V/O wiring conditions, the star delta starter can be used.