Low price 40A 25Hp/ 44Hp 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 asynchronous motor.

Star Delta Starter Specification

• Model: RDDLZ-QJX2-40
• Rated Operational Current (AC-3): 40A
• Coil Rated Voltage: 220V AC, 380V AC (Optional)
• Contact Form: 3P
• Power of Controllable 3-phase Squirrel-cage Motor (AC-3): 220V, 18.5kW; 380V, 33kW
• Conventional Heating Current: 60A
• Rated Insulation Voltage: 690V
• Electric Life: 600 times/h
• Mechanical Life: 3600 times/h
• Matching Fusing Model: RT16-20
• 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*185mm
• Weight: 4.36kg

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: Star delta starter for 3 phase induction motor

• The star-delta step-down start of the asynchronous motor is simple and easy to implement, and the current is greatly reduced.
• Since the starting current of the motor is proportional to the power supply voltage, the starting current provided by the grid at this time is only 1/3 of the starting current of the full voltage, so the starting torque is only 1/3 of the starting torque of the full voltage, which is only suitable for no-load or light motor. When the load is started.
• The switching time can be significantly reduced as a sign according to the starting process current, and the switching can be done immediately;
• The delayed switching time of the star-delta step-down starting process of the asynchronous motor is too early, the current is large, and the motor runs for a long time under low voltage too late, and the motor is easy to heat.
• The star-delta step-down start-up process of the asynchronous motor includes two processes: Y-connected step-down start and corner-connected full-voltage operation.
• It is a step-down start, which is realized by sacrificing power in exchange for reducing the starting current. Therefore, it cannot be determined by the size of the motor power whether it is necessary to use a star-delta start, and what kind of load it is.
• Time and current converters can be used to realize delay and current dual-signal switching, which can achieve instant switching without delaying time, and avoid continuous low-voltage operation of the motor for a long time.