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QZB Series - Three-Phase Self-Coupling Voltage Reducing Starters
The QZB series self-coupling voltage reducing starters provide soft-start capability for large three-phase induction motors, reducing inrush current.
Model Number Breakdown
QStarting
ZSelf-coupling
BTransformer
Key Features
- Reduced voltage starting for large motors
- 60%/80% tap voltage selection
- Automatic timer control
- Thermal overload protection
Applications
- Large pump motors
- Fan motor starting
- Compressor starting
- Conveyor belt systems
TECHNICAL DRAWING
Model: QZB-75 | Type: Oil-immersed transformer | Capacity: 75 kVA
FRONT ELEVATION
ELECTRICAL SCHEMATIC
EFFICIENCY vs LOAD
SIDE VIEW
TOP VIEW
TERMINAL BLOCK
CORE & WINDING
LEGEND:
Iron core
HV winding/bushing
LV winding/bushing
Dimension line
Specifications Range
All specifications and dimensions can be customized upon request
Model Selector
| Key parameters | Model Range |
|---|---|
| Capacity | 14–300 kVA |
| Frequency (Hz) | 50 |
Select 2-3 models to compare
| Compare | Model | Series | Capacity (kVA) | Input voltage | Output voltage | Frequency (Hz) | Rated current (A) | Weight | Dimensions |
|---|---|---|---|---|---|---|---|---|---|
| QZB-14 | QZB | 14VA | 380V | Reduced voltage start | 50 | 28A | 105 kg | 410×200×390 mm | |
| QZB-20 | QZB | 20VA | 380V | Reduced voltage start | 50 | 40A | 140 kg | 430×215×390 mm | |
| QZB-28 | QZB | 28VA | 380V | Reduced voltage start | 50 | 56A | 190 kg | 450×270×410 mm | |
| QZB-30 | QZB | 30VA | 380V | Reduced voltage start | 50 | 59A | 200 kg | 450×270×410 mm | |
| QZB-40 | QZB | 40VA | 380V | Reduced voltage start | 50 | 80A | 250 kg | 425×360×420 mm | |
| QZB-55 | QZB | 55VA | 380V | Reduced voltage start | 50 | 110A | 320 kg | 510×300×460 mm | |
| QZB-75 | QZB | 75VA | 380V | Reduced voltage start | 50 | 142A | 400 kg | 540x±x2 | |
| QZB-115 | QZB | 115VA | 380V | Reduced voltage start | 50 | 230A | 560 kg | 570×475×570 mm | |
| QZB-135 | QZB | 135VA | 380V | Reduced voltage start | 50 | 270A | 645 kg | 650x±x2 | |
| QZB-190 | QZB | 190VA | 380V | Reduced voltage start | 50 | 370A | 860 kg | 700x±x2 | |
| QZB-225 | QZB | 225VA | 380V | Reduced voltage start | 50 | 410A | 1000 kg | 700×580×700 mm | |
| QZB-260 | QZB | 260VA | 380V | Reduced voltage start | 50 | 475A | 1140 kg | 700×580×700 mm | |
| QZB-300 | QZB | 300VA | 380V | Reduced voltage start | 50 | 535A | 1290 kg | 700×580×700 mm |
Instant Selection & Quote Calculator
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EXW (FOB Qingdao)
$18
Range $17 ~ $20 (±8%)
Price Breakdown
| Base price (interpolation) | $18 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
Shipping quoted separately per destination port.
Aluminum winding — no copper linkage
Reference prices are for estimation only and do not constitute a formal offer.
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