Product Search
Find the right transformer for your needs
Images are for illustration purposes only
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
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:
Specifications Range
All specifications and dimensions can be customized upon request
Model Selector
| Key parameters | Model Range |
|---|---|
| Capacity | 14–300 kVA |
| Frequency (Hz) | 50 |
| 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
Select your specifications to get an estimated price instantly.
More options(2)
Certification
The values below are computed from what you selected above. Anything that cannot be computed yet is shown as an em dash — never as zero.
Iₙ = S / (√3·U) · I_sc = 100·Iₙ / uₖ · S_sc = √3·U·I_sc · I_p = k·Iₖ
Still required to complete the calculation: rated capacity S, impedance voltage uₖ, short-time or peak withstand current.
Per-model values (P0 / Pk / uₖ declared by the factory, losses, noise, temperature rise, dimensions, weight) are not in the product library: those rows stay at an em dash until the factory parameter sheet is supplied. An em dash means the value is unavailable — it is never rendered as zero.
Read-only: no price factor, not part of the sum — the loss-grade cost is already carried by the efficiency (subtype) base price, so charging here would double-bill. Values come from the product library type-test data, interpolated between published capacities; grades the library does not cover show an em dash, never zero.
Reference prices are for estimation only and do not constitute a formal offer.
3 · Get this quote
We will reply with your latest quote instantly.
Related Engineering Calculators
Free sizing and pricing tools for this product category.