QZB Series Auto-coupling Reduced-voltage Starting Transformer

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.

product details

Type & 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
Relative Humidity: ≤90%
Temperature Rise: ≤60℃
Insulation Resistance: 50Ω
Input Voltage: 380V/220V
Output Voltage: Customizable
Waveform Distortion: No Additional Waveform Distortion
Ambient Temperature: -5~40℃

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		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