Application
For AC 50 Hz, rated voltage 380 V and motor power 14 kW–300 kW.
JIADEST / Motor-starting Autotransformers
Motor-Starting Autotransformers
Manufacturer’s series: QZB
Autotransformers for infrequent reduced-voltage starting of three-phase squirrel-cage induction motors, reducing the effect of starting on the supply network.
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Product reference photograph. Refer to the technical tables and drawings for each configuration.
Model designation
Q: reduced-voltage starting; Z: autotransformer; B: transformer; suffix: power of the controlled motor.
Technical specifications.
| Parameter | Published specification |
|---|---|
| Supply frequency | 50 Hz |
| Rated voltage | 380 V |
| Controlled motor power | 14–300 kW |
Models & configurations.
Designations are retained as published. Separate rows or variants with the same designation remain distinct in the relevant tables.
- QZB-1414 · 30 · 28
- QZB-2020 · 30 · 40
- QZB-2828 · 30 · 56
- QZB-3030 · 30 · 59
- QZB-4040 · 30 · 80
- QZB-5555 · 30 · 110
- QZB-7575 · 30 · 142
- QZB-115115 · 50 · 230
- QZB-135135 · 50 · 270
- QZB-190190 · 70 · 370
- QZB-225225 · 70 · 410
- QZB-260260 · 70 · 475
- QZB-300300 · 70 · 535
- QZB-14230 · 115 · 12×20 · 280 · 144 · 226
- QZB-17230 · 115 · 12×20 · 280 · 144 · 226
- QZB-20272 · 105 · 8×20 · 279 · 138 · 229
- QZB-22242 · 115 · 8×20 · 179 · 138 · 229
- QZB-28284 · 113 · 9×20 · 321 · 153 · 261
- QZB-30284 · 113 · 9×20 · 321 · 153 · 261
- QZB-40270 · 128 · 12×40 · 371 · 168 · 282
- QZB-45270 · 128 · 10×48 · 371 · 168 · 282
- QZB-55248 · 132 · Φ14 · 352 · 163 · 280
- QZB-75246 · 125 · Φ14 · 371 · 164 · 295
- QZB-115312 · 161 · 12×18 · 392 · 203 · 315
- QZB-135310 · 168 · 12×18 · 391 · 207 · 314
Main technical characteristics
| Model | Controlled motor power (kW) | Maximum starting 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 |
Overall and mounting dimensions
| Model | Mounting A (mm) | Mounting C (mm) | Mounting hole K×J (mm) | Overall A (mm) | Overall D (mm) | Overall E (mm) |
|---|---|---|---|---|---|---|
| QZB-14 | 230 | 115 | 12×20 | 280 | 144 | 226 |
| QZB-17 | 230 | 115 | 12×20 | 280 | 144 | 226 |
| QZB-20 | 272 | 105 | 8×20 | 279 | 138 | 229 |
| QZB-22 | 242 | 115 | 8×20 | 179 | 138 | 229 |
| QZB-28 | 284 | 113 | 9×20 | 321 | 153 | 261 |
| QZB-30 | 284 | 113 | 9×20 | 321 | 153 | 261 |
| QZB-40 | 270 | 128 | 12×40 | 371 | 168 | 282 |
| QZB-45 | 270 | 128 | 10×48 | 371 | 168 | 282 |
| QZB-55 | 248 | 132 | Φ14 | 352 | 163 | 280 |
| QZB-75 | 246 | 125 | Φ14 | 371 | 164 | 295 |
| QZB-115 | 312 | 161 | 12×18 | 392 | 203 | 315 |
| QZB-135 | 310 | 168 | 12×18 | 391 | 207 | 314 |
DIMENSIONS / CONNECTIONS / SOURCE DATA
Technical information and original product sheets.
The original sheet retains all dimensioned drawings, connection diagrams, table footnotes and published values. It is supplied in its original language for direct verification against the English specification.
Open original sheet at native resolution ↗View complete original technical sheet (Chinese)
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Discuss your Motor-starting Autotransformers requirements.
Use the exact model, voltage, current or power rating, duty cycle and drawing reference when requesting a quotation. Confirm source discrepancies and project-specific requirements in the approved technical agreement.