Transformers & Substations > AC Voltage Stabilizers
WBT Stabilizing Step-Down Transformer Integrated Unit
Most AC stabilizers correct voltage without changing its level — they take a fluctuating 380V in and hold a steady 380V out. The WBT does both jobs in one cabinet: a purpose-built step-down transformer converts three-phase 380V input to three-phase 220V output, while a copper regulation coil and 1017 carbon brush correct fluctuations at the same time, settling within 1 second of a 10% input step change and reacting in as little as 0.05 seconds. That combination is aimed specifically at equipment built for 220V lines running on a 380V supply — precision machine tools, injection molding machines, machining centers, optical curve grinders, laser cutters, and other high-power shop-floor equipment where a separate transformer-plus-stabilizer setup would take up more panel space than a single integrated unit. Optional EMI filtering, surge protection, and RS232/RS485 remote monitoring extend it for unattended, continuous-duty installations.
Key Features
One cabinet, two jobs — voltage conversion and voltage stabilization handled together, with monitoring and protection built in.
Integrated Step-Down + Regulation
Converts three-phase 380V input to three-phase 220V output while correcting voltage fluctuation in the same unit — no separate transformer needed.
Fast Response, Fast Settling
Reacts to voltage deviation in as little as 0.05 seconds and settles within 1 second of a 10% step change in input voltage.
Automatic Bypass
Switches to a direct bypass path when input voltage is stable or during maintenance, keeping connected equipment powered without interruption.
High Operating Efficiency
Rated above 94% efficiency below 50KVA and above 96% above 100KVA, with noise held to ≤55dB.
Optional Remote Monitoring
RS232/RS485 interfaces support remote control, signaling, and metering for unattended installations (optional).
Optional Surge & EMI Protection
Lightning/surge protection and EMI filtering are available as configurable add-ons for facilities exposed to grid transients.
OEM & ODM Capabilities
Built-to-order integrated stabilization for machine shops, manufacturers, and B2B distribution partners.
Configurable Power Rating
Sized to your connected load across the WBT-S platform.
Custom Input/Output Voltage
Standard 380V±20% three-phase or 220V±20% single-phase input, with output adjustable within ±5% of rated voltage; special voltage combinations available on request.
Enclosure & Branding Customization
Custom enclosure finish, nameplate, and packaging available for private-label and distributor programs.
Monitoring Interface Options
RS232/RS485 remote monitoring, EMI filtering, and surge protection configurable as add-ons.
Adjustable Protection Thresholds
Over-voltage, under-voltage, overload, phase-reversal, and short-circuit thresholds tunable to project specification.
Small-Batch & Bulk Production
Configurable order quantities from small-batch trial runs to full container bulk production.
Technical Specifications
Full electrical, protection, and performance data for the WBT integrated stabilizing transformer.
| Unit Type | Integrated Voltage Stabilizer + Step-Down Transformer |
|---|---|
| Rated Input Voltage | 380V ±20% (three-phase) / 220V ±20% (single-phase), special voltages available |
| Rated Output Voltage | Adjustable within ±5% of rated output voltage |
| Frequency | 50Hz/60Hz |
| Response Time | ≤0.05s |
| Settling Time | ≤1s for a 10% step change in input voltage |
| Operating Efficiency | >94% below 50KVA, >96% above 100KVA |
| Noise Level | ≤55dB |
| Metric | Value | Notes |
|---|---|---|
| Response Time | ≤0.05s | Fastest correction stage |
| Settling Time | ≤1s | 10% input step change |
| Efficiency | >94% / >96% | Below 50KVA / above 100KVA |
| Noise Level | ≤55dB |
| Model | Capacity | Rated Current | Product Dimensions (L×W×H mm) |
|---|---|---|---|
| WBT-S50KVA | 50KVA | 75.9A | 550×780×1200 |
| WBT-S60KVA | 60KVA | 91.1A | 550×780×1200 |
| WBT-S80KVA | 80KVA | 121.5A | 620×925×1300 |
| WBT-S100KVA | 100KVA | 152A | 620×925×1300 |
| WBT-S120KVA | 120KVA | 182.3A | 620×925×1300 |
| WBT-S150KVA | 150KVA | 227.9A | 700×1025×1390 |
| WBT-S200KVA | 200KVA | 303.8A | 700×1025×1390 |
| WBT-S250KVA | 250KVA | 379.8A | 1000×750×1600 |
| WBT-S300KVA | 300KVA | 455.8A | 1100×800×1800 |
| WBT-S350KVA | 350KVA | 531.7A | 1100×800×1800 |
| WBT-S400KVA | 400KVA | 607.7A | 1200×900×1800 |
| WBT-S500KVA | 500KVA | 759.6A | 1100×1250×2000 |
| WBT-S600KVA | 600KVA | 759.6A | 1100×1250×2000 |
| WBT-S1400KVA | 1400KVA | 2127A | 800×1100×2200 (3-cabinet configuration) |
Construction & Configuration
Inside the WBT unit: how a step-down transformer and a copper regulation coil share one cabinet to convert and stabilize voltage together.
Step-Down Transformer Core
Imported silicon-steel sheet core with high-temperature-resistant windings converts three-phase 380V input to three-phase 220V output.
Copper Regulation Coil
High-temperature-resistant pure copper winding handles the voltage regulation function alongside the step-down transformer.
1017 Carbon Brush Assembly
Selected 1017-grade carbon brush repositions in response to input fluctuation, restoring stable output within about 1 second.
Automatic Control & Protection Circuit
Monitors output against short-circuit, overload, phase-reversal, over-voltage, and under-voltage conditions, triggering alarms and cutoffs per configurable thresholds.
Bypass Circuit
Provides a direct pass-through supply path when input voltage is stable or during unit maintenance, keeping downstream equipment powered.
Optional Monitoring & Protection Add-Ons
RS232/RS485 remote monitoring interface, EMI filtering, and lightning/surge protection available as configurable options.
Standards & Test Documentation
Performance, safety, and documentation support behind every WBT integrated unit.
Response & Efficiency
Reacts in as little as 0.05 seconds and settles within 1 second of a 10% input step change, with operating efficiency above 94% below 50KVA and above 96% above 100KVA.
Insulation & Dielectric Withstand
Insulation resistance ≥2MΩ to ground; rated to withstand 2000VAC for 1 minute without breakdown or flashover.
OEM/ODM Technical Support
Full technical datasheets, dimensional drawings, and test reports available on request to support OEM/ODM integration and procurement evaluation.
Need Voltage Stabilization and Step-Down Conversion in One Unit?
Share your connected 220V equipment load, incoming 380V supply details, and monitoring requirements — our engineering team will configure the right WBT unit for your shop floor.