China QZB Series Auto-coupling Reduced-voltage Starting Transformer Factory, Companies

1 / 3

China QZB Series Auto-coupling Reduced-voltage Starting Transformer Factory, Companies

QZB series auto-coupling reduced-voltage starting transformers are specially designed for the infrequent reduced-voltage starting of three-phase squirrel-cage induction motors. Suitable for 50Hz AC systems with 380V rated voltage and motor power from 14kW to 300kW, they effectively reduce the starting impact on the power supply network. This series offers a capacity range of 25VA~10KVA, 380V/220V input voltage, customizable output voltage, ≤60℃ temperature rise, 50Ω insulation resistance, and stable performance at -5~40℃ ambient temperature with no additional waveform distortion.

Send Inquiry

Product Description

Type & Meaning

Item	Designation & Meaning
1	Reduced-voltage Starting
2	Auto-coupling Type
3	Transformer
4	Rated Motor Power (kW)

Technical Parameters

Product Brand

MINGRI

Product Name

QZB Auto-coupling Transformer

Product Model

QZB Series

Product Capacity

25VA ~ 10KVA

Product Frequency

50Hz

Input Voltage

380V / 220V

Output Voltage

Customizable

Relative Humidity

≤ 90%

Temperature Rise

≤ 60°C

Insulation Resistance

50Ω

Ambient Temperature

-5 ~ 40°C

Waveform Distortion

No Additional Waveform Distortion

Product Display

Outline and Installation Dimensions

QZB Series Outline & Mounting Dimensions

Model	Rated Motor Power (kW)	Maximum Operating Time (s)	Maximum Operating Current (A)
QZB-14	14	30	28
QZB-20	20	30	40
QZB-28	28	30	56
QZB-30	30	30	59
QZB-40	40	30	80
QZB-55	55	30	110
QZB-75	75	30	142
QZB-115	115	50	230
QZB-135	135	50	270
QZB-190	190	70	370
QZB-225	225	70	410
QZB-260	260	70	475
QZB-300	300	70	535

Model	Mounting Dimensions (mm)		Mounting Hole	Overall Dimensions (mm)
Model	A	C	KJ×J	B	D	E
QZB-14	180	100	12×20	270	144	255
QZB-17	180	100	12×20	270	144	255
QZB-20	180	100	12×20	270	144	255
QZB-22	195	110	12×20	300	145	260
QZB-28	195	125	12×20	300	160	260
QZB-30	195	125	12×20	300	160	260
QZB-40	195	125	12×20	300	160	280
QZB-45	195	125	12×20	300	160	280
QZB-55	260	120	12×20	300	170	300
QZB-75	260	135	12×20	370	185	300
QZB-90	320	150	12×20	370	200	330
QZB-115	320	150	12×20	420	200	330
QZB-135	320	150	12×20	420	200	330
QZB-160	320	150	12×20	420	200	380
QZB-190	320	170	12×20	420	220	380
QZB-225	340	145	12×20	420	230	420
QZB-260	340	155	12×20	540	240	420
QZB-300	340	155	12×20	540	240	420

Frequently Asked Questions

What is the primary function of the QZB Series auto-coupling transformer?

The QZB series transformer is designed for reduced-voltage starting of three-phase induction motors. It lowers the starting current impact on the electrical grid during startup and switches to full voltage once the motor reaches regular operating speed.

What input voltages are supported by the QZB series?

The standard models support dual primary input voltages of 380V and 220V at a operating frequency of 50Hz, with customizable output voltage configurations available.

What are the recommended operating environment conditions?

The unit operates optimally within an ambient temperature range of -5°C to +40°C and relative humidity levels not exceeding 90%. Temperature rise remains strictly below ≤60°C under regular cycles.

What is the maximum operating time allowed during a motor start?

Depending on model capacity, maximum starting duration ratings range between 30 seconds for lower power units (14kW to 75kW), up to 50 seconds (115kW to 135kW), and 70 seconds for higher-capacity units (190kW to 300kW).

Does this autotransformer induce waveform distortion into the power system?

No, the QZB series is engineered to operate cleanly with no additional waveform distortion, maintaining smooth power transition across typical industrial setups.

China QZB Series Auto-coupling Reduced-voltage Starting Transformer Factory, Companies

Product Description

Type & Meaning

Technical Parameters

Product Display

Outline and Installation Dimensions

Frequently Asked Questions

What is the primary function of the QZB Series auto-coupling transformer?

What input voltages are supported by the QZB series?

What are the recommended operating environment conditions?

What is the maximum operating time allowed during a motor start?

Does this autotransformer induce waveform distortion into the power system?

Related Products

Wholesale BK Series Control Transformers – Reliable Power Solutions Factory, Company

China BKC Series Control Transformers – Compact, Reliable Power Solutions Factory, Companies

High-Quality JBK3 series machine tool control transformers Manufacturer, Factory

High-Quality JBK5 Series Machine Tool Control Transformer Factories, Companies

ODM JMB/BJZ/DG/BZ(DM) Series Lighting & Hand Lamp Control Transformer Suppliers, Company

Wholesale JSG Series Three-phase Dry-type Transformer (Servo Transformer) Supplier, Manufacturers

China QZB Series Auto-coupling Reduced-voltage Starting Transformer Factory, Companies

ODM SG/ZSG/SBK Series Three-Phase Dry-Type (Rectifier) Transformer Supplier, Manufacturers

ODM Mining Transformer /Integrated Protection Transformer Companies, Company

High-Quality CKSG Series Low Voltage Series Reactor Manufacturers, Manufacturer