BUMOTEC S181 Mill-Turn Center
Three-Phase Industrial Voltage Stabilizer (Servo Type, SBW Series)
Industrial Automatic Voltage Regulator (AVR) for unstable three-phase power systems.
Rated Power:20~3000KVA
Grid Voltage(L-L):
200V/208V/220V/380V/400V/415V/440V/480V
Phases: 3-phase
Input Range:±15%; ±20% / ±30% / ±40% Customizable
Input Frequency: 50/60Hz±10%
Output Accuracy:±1–5% (2% Standard)
CE Certified | ISO 9001 | 20+ Years Power Manufacturing
SBW Three-Phase Servo Voltage Stabilizer Overview
The SBW series is Winzele’s three-phase copper-column servo voltage stabilizer, designed and manufactured for industrial power systems requiring reliable voltage regulation. The servo motor compensation system uses closed-loop voltage control to continuously adjust output voltage and maintain stable power under unstable grid conditions.
Available from 20KVA to 3000KVA, the SBW series supports 50Hz/60Hz three-phase systems from 200V to 480V, with configurable input ranges, voltage levels, and transformer arrangements to match different industrial installation requirements. The series can be configured as an industrial automatic voltage regulator (AVR) for factories, production equipment, and centralized power distribution systems.
SBW is Winzele’s three-phase copper-column servo voltage stabilizer series, while the DBW series covers single-phase applications.
Is This the Right Voltage Stabilizer for Your Application?
Quickly check whether your voltage problem matches the typical operating conditions of the SBW series.
Sustained Low or High Voltage
A site may operate continuously below or above the nominal voltage due to weak distribution networks, long feeder runs, or heavy upstream loading. Equipment then operates outside its designed voltage range, which can reduce motor performance, increase electrical stress, and affect process stability. A voltage stabilizer regulates the output voltage toward the equipment’s required operating level.
Continuous Voltage Fluctuation
Some grids experience continuous voltage variation during the day as loading conditions change. Equipment connected to such supplies may experience inconsistent performance and increased stress on electrical components and control systems. A voltage stabilizer helps maintain a more stable supply condition.
Load-Related Voltage Variation
Large connected loads can cause noticeable voltage variation on a shared feeder, especially when high-current equipment starts or multiple loads operate simultaneously. The voltage at each machine depends on the condition of the connected network, so the stabilizer is typically installed at the incoming supply of the affected equipment or distribution point.
Industrial Equipment & Factory Distribution
Representative applications include machine tools, automation equipment, printing equipment, pumps, compressors, HVAC systems, medical imaging systems, production lines, and factory distribution systems. These applications are representative rather than limiting; the same stabilizer family serves both individual equipment and centralized distribution points.
Note: SBW is intended for sustained or repeated voltage variation. Voltage sag, harmonics, transients, and frequency instability require other power-quality solutions.
Featured Project Cases
Selected installations using Winzele voltage stabilization equipment.
Siemens SOMATOM CT · 100KVA AVR
DMG MORI DMC 210 FD · 250KVA Voltage Stabilizer with Isolation Transformer
2×500KVA Voltage Stabilizer for Semiconductor Packaging
Schneider BlokSeT · 800KVA
Volkswagen EV Battery PACK Line · 1200KVA
Looking for a similar project?
Explore more real installations by equipment, industry and capacity.
Key Technical Specifications
Electrical
| Specification | Value |
|---|---|
| Three-phase SBW Capacity | 20KVA–3000KVA |
| Rated Voltage | Three-phase 200V/208V/220V/380V/400V/415V/440V/480V (any voltage customizable) |
| Input Voltage Range | (Rated Voltage)±20%, e.g. 380V±20%; ±15% / ±30% / ±40% configurable |
| Frequency | Input default 40~79Hz (customizable); output same as input |
| Output Voltage | Three-phase 380V/400V/415V (±10% adjustable); other voltages customizable |
| Output Voltage Accuracy | ±1-5% (2-5% for standard products) |
| Stabilization Time | <1 second (input voltage changes 10% within rated range, load 0-100%) |
| Efficiency | 98% |
| Output THD Increase | <0.1% (static and dynamic) |
Voltage Configuration Note: where the available grid voltage differs substantially from the required equipment voltage, voltage stabilization can be integrated with an appropriate transformer or voltage-conversion configuration. For wide voltage fluctuations, the input regulation range should be selected from the measured minimum and maximum site voltage during project sizing.
Load & Protection
| Specification | Value |
|---|---|
| Applicable Load Type | Any load type (resistive, inductive, capacitive) |
| Overload Capacity | 120% 10min; 150% 1min |
| Bypass | Manual bypass; automatic bypass on internal fault optional |
| Protection Functions | Input overvoltage (OV), overcurrent (OC), undervoltage (UV); transformer overheat; short circuit |
| Isolation Transformer | Δ/Y or Y/Y (optional) |
| Communication | RS485 / RS232, MODBUS-RTU (TCP/IP, GPRS optional) |
Environment
| Specification | Value |
|---|---|
| Working Temperature & Relative Humidity | -35°C~+55°C; 10%-90% (20°C±5°C) |
| Altitude | <2000m; derate 10% per additional 1000m |
| IP Class | IP20 (outdoor IP33 etc. customizable) |
| Noise Level | <55dB |
Voltage Stabilizer Capacity Selection & Project Sizing
Single Equipment
Select based on the equipment rated power, rated current, and actual operating load. Check starting current and peak current where applicable. The load type determines the required reserve margin.
Production Line
Calculate based on the loads operating simultaneously rather than simply adding every equipment nameplate rating. Consider the largest starting load, machine operating sequence, and the load mix connected to the same supply point.
Whole Factory / Centralized Distribution
Consider the factory transformer capacity, actual simultaneous demand, and future expansion requirements rather than the simple sum of all connected loads. Confirm whether isolation transformation or voltage conversion is required for the installation.
There is no universal 20% or 30% sizing rule; the required reserve margin depends on load characteristics and site conditions.
Information Required for Voltage Stabilizer Sizing
- Input Voltage: nominal / minimum / maximum
- Output Requirement: required voltage / frequency
- Load Information: capacity / rated current / load type
- Starting Characteristics: Starting current or peak current if applicable
- Installation: Environment / altitude / installation location
- Options: Isolation transformer / voltage conversion requirements
Custom Voltage Stabilizer Design & Manufacturing Capability
Winzele provides customized voltage stabilizer solutions for different grid conditions, equipment requirements, and installation environments.
The SBW series can be configured with:
- Custom input and output voltage ratings
- 50Hz / 60Hz frequency systems
- Isolation transformer integration when electrical isolation is required
- Voltage conversion solutions for regional power systems
- Customized enclosure, protection, and installation arrangements
Each system is manufactured according to project requirements, with electrical parameters, mechanical structure, and protection functions confirmed before production.
SBW Models and Dimensions
(Input voltage available for three-phase 200V/208V/220V/380V/400V/415V/440V/480V, etc.)
Three-Phase SBW Models
| Type | Capacity (kVA) | Current (A) | Dimension W×D×H (mm) |
|---|---|---|---|
| SBW-S-20KVA | 20 | 30 | 500*800*1000mm |
| SBW-S-30KVA | 30 | 45.6 | 500*800*1000mm |
| SBW-S-50KVA | 50 | 76 | 500*800*1000mm |
| SBW-S-80KVA | 80 | 121.6 | 550*880*1000mm |
| SBW-S-100KVA | 100 | 152 | 550*880*1000mm |
| SBW-S-120KVA | 120 | 182 | 620*920*1200mm |
| SBW-S-150KVA | 150 | 228 | 620*920*1200mm |
| SBW-S-180KVA | 180 | 274 | 700*1000*1300mm |
| SBW-S-200KVA | 200 | 304 | 700*1000*1300mm |
| SBW-S-250KVA | 250 | 380 | 1000*700*1500mm |
| SBW-S-300KVA | 300 | 456 | 1100*800*1900mm |
| SBW-S-350KVA | 350 | 532 | 1100*800*1900mm |
| SBW-S-400KVA | 400 | 608 | 1100*800*1900mm |
| SBW-S-500KVA | 500 | 760 | 1100*900*2000mm |
| SBW-S-600KVA | 600 | 912 | 1100*900*2000mm |
| SBW-S-800KVA | 800 | 1216 | 2000*1000*2000mm |
| SBW-S-1000KVA | 1000 | 1520 | 2000*1000*2000mm |
| SBW-S-1200KVA | 1200 | 1824 | 2000*1000*2000mm |
| SBW-S-1500KVA | 1500 | 2280 | 1350*1250*2200mm 3 cabinets |
| SBW-S-2000KVA | 2000 | 3040 | 1500*1350*2200mm 3 cabinets |
| SBW-S-2500KVA | 2500 | 3800 | 1500*1350*2200mm 3 cabinets |
| SBW-S-3000KVA | 3000 | 4560 | 1600*1350*2200mm 3 cabinets |
Explore More SBW Series Configurations
Explore SBW series options by capacity, voltage system, frequency and customized transformer configurations.
Our Manufacturing Process
Four core processes ensure exceptional quality
Core Manufacturing
Core Manufacturing
High-grade silicon steel core for low loss and low-noise operation.
Coil Winding
Coil Winding
Automatic copper winding for precise layers and stable performance.
Final Assembly
Final Assembly
Complete voltage stabilizer assembly and electrical integration.
Testing & Final Inspection
Testing & Final Inspection
Electrical testing, functional checks, and final inspection before delivery.
Quality & Compliance
Certified quality management and product compliance for industrial power equipment.
International Customer Visits & Technical Exchange
International customers visit Winzele manufacturing facilities for equipment inspection, technical discussion and project communication.
Factory Tour & Manufacturing Capability
Manufacturing processes, production equipment and quality control facilities at Winzele.
How the SBW Servo Voltage Stabilizer Works
The controller continuously measures the output voltage and compares it with the configured set value. When a sustained deviation is detected, it drives the servo motor. The servo motor moves the brush assembly along the regulating transformer, changing the regulating transformer output. The resulting compensation voltage is applied through the series compensating transformer, correcting the output voltage toward the configured value. The control system repeats this measurement and adjustment continuously while monitoring abnormal conditions through the configured protection functions.
Figure 1 shows the compensation path: the compensating transformer is connected in series with the main circuit and is fed by the regulating transformer. With the impedance voltage drop of the compensating transformer neglected, the output voltage is:
Uao = Uai + UBa
Figure 1. SBW Compensation Voltage Regulation Principle
For engineers requiring detailed calculation methods, including compensation voltage derivation, regulating transformer parameters, servo drive mechanism, speed reducer, chain wheel, and brush assembly details, please refer to the full technical datasheet.
Full Technical Datasheet
Download Full SBW Technical Datasheet (PDF)
The datasheet includes detailed specifications for controller functions, communication interfaces, protection features, measurement parameters, and control settings.
Get a Quick Quote
Contact our sales team for pricing, technical specifications, and delivery information.
Send Inquiry
