Transformers & Substations > AC Voltage Stabilizers
ZBW Contactless Electronic Voltage Regulator
Mechanical servo regulators correct voltage by physically moving a carbon brush — a process that takes over a second and wears a contact surface over years of duty. The ZBW series takes a different approach: a microcomputer-grade CPU samples voltage at 64 points per cycle through a 12-bit high-speed AD converter, then drives a contactless zero-crossing electronic switch that layers a synchronized compensating sine wave onto the output — no brush, no moving contact, no mechanical wear. That architecture cuts response time to approximately 10 milliseconds, roughly two orders of magnitude faster than a mechanical unit, while an isolation transformer, LCD monitoring, and a full protection suite handle everything from harmonic interference to phase imbalance. Available across the three-phase ZBW-S platform (10-1200KVA) and single-phase ZBW-D platform (3-50KVA), with synchronized or independent per-phase regulation modes selectable automatically or by hand.
Key Features
What contactless, CPU-driven regulation makes possible — speed, precision, and load flexibility a mechanical unit can’t match.
Millisecond-Class Response
Contactless zero-crossing switching corrects voltage in approximately 10 milliseconds — roughly 150× faster than a mechanical brush-type regulator's ~1.5-second response.
High-Speed Digital Sampling
A 12-bit AD converter samples 64 points per electrical cycle, with the CPU running real-time RMS calculation and digital filtering for accurate, noise-resistant measurement.
Selectable Three-Phase Regulation Modes
Switch between synchronized regulation (averaging all three phases to improve balance) and independent per-phase regulation, or let the microcomputer auto-select the right mode.
Zero-Distortion Sine Output
A contactless zero-crossing switch layers a synchronized compensating waveform onto the output, correcting voltage without introducing waveform distortion.
Soft-Start with Automatic Bypass
Regulates voltage before connecting the load, and can switch seamlessly to a utility-bypass mode without interrupting supply if a fault occurs.
Full Protection with Audible Alarm
Over-voltage, under-voltage, phase-loss, overload, and short-circuit protection trigger within 1 second, paired with an audible and visual fault alarm.
OEM & ODM Capabilities
Built-to-order contactless regulation for distributors, system integrators, and B2B partners across single- and three-phase applications.
Configurable Power Rating
Three-phase ZBW-S from 10-1200KVA and single-phase ZBW-D from 3-50KVA, sized to your load.
Custom Input Voltage Window
Standard 323-437V (three-phase) or 187-253V (single-phase) input windows, both customizable to your grid conditions.
Enclosure & Branding Customization
Custom enclosure finish, nameplate, and packaging available for private-label and distributor programs.
Regulation Mode Configuration
Synchronized, independent, or auto-select three-phase regulation logic configurable to your load's balance requirements.
Isolation Transformer Options
Shell-type isolation transformer construction selectable by structure to match application and safety requirements.
Small-Batch & Bulk Production
Configurable order quantities from small-batch trial runs to full container bulk production.
Technical Specifications
Full electrical, protection, and dimensional data across both the three-phase ZBW-S and single-phase ZBW-D platforms.
| Regulator Type | Contactless Electronic AC Voltage Regulator (Zero-Crossing Switching, CPU-Controlled) |
|---|---|
| Series | ZBW-S (Three-Phase, 10-1200KVA) / ZBW-D (Single-Phase, 3-50KVA) |
| Rated Input Voltage | 323-437V, customizable (ZBW-S) / 187-253V, customizable (ZBW-D) |
| Rated Output Voltage | 380V ±1%, three-phase four-wire + ground (ZBW-S) / 220V ±1%, single-phase (ZBW-D) |
| Frequency | 50/60Hz |
| Working Mode | Voltage-regulation mode and utility-bypass mode |
| Response Speed | ~10ms for external voltage change >10% |
| Installation Conditions | Indoor use, IP20 protection |
| Metric | Value | Notes |
|---|---|---|
| Capacity Range | 3-1200KVA | ZBW-D (single) / ZBW-S (three-phase) |
| Response Speed | ~10ms | >10% external voltage change |
| Sampling Resolution | 12-bit, 64 points/cycle | Real-time true-RMS calculation |
| Protection Rating | IP20 | Indoor installation |
| Model | Rated Capacity | Rated Output Current | Cabinet Dimensions (W×D×H mm) | Weight |
|---|---|---|---|---|
| ZBW-S10 | 10KVA | 15A | 350×600×750 | 140kg |
| ZBW-S20 | 20KVA | 30A | 350×600×750 | 160kg |
| ZBW-S30 | 30KVA | 46A | 350×600×750 | 180kg |
| ZBW-S50 | 50KVA | 76A | 390×650×750 | 195kg |
| ZBW-S80 | 80KVA | 120A | 460×650×1200 | 316kg |
| ZBW-S100 | 100KVA | 152A | 460×650×1200 | 330kg |
| ZBW-S120 | 120KVA | 180A | 460×650×1200 | 380kg |
| ZBW-S150 | 150KVA | 228A | 700×700×1600 | 450kg |
| ZBW-S180 | 180KVA | 273A | 700×700×1600 | 490kg |
| ZBW-S200 | 200KVA | 300A | 700×700×1600 | 530kg |
| ZBW-S250 | 250KVA | 342A | 1100×800×2100 | 630kg |
| ZBW-S320 | 320KVA | 486A | 1100×800×2100 | 720kg |
| ZBW-S400 | 400KVA | 608A | 1100×800×2100 | 810kg |
| ZBW-S500 | 500KVA | 760A | 1100×800×2100 | 910kg |
| ZBW-S600 | 600KVA | 912A | 1100×800×2100 | 1050kg |
| ZBW-S800 | 800KVA | 1216A | 1800×1000×2100 | 1300kg |
| ZBW-S1000 | 1000KVA | 1520A | 1800×1000×2100 | 1650kg |
| ZBW-S1200 | 1200KVA | 1824A | 1800×1000×2100 | 1900kg |
| ZBW-D3 | 3KVA | 14A | 300×600×600 | 20kg |
| ZBW-D5 | 5KVA | 23A | 300×600×600 | 28kg |
| ZBW-D10 | 10KVA | 45A | 300×600×600 | 50kg |
| ZBW-D20 | 20KVA | 91A | 300×600×600 | 80kg |
| ZBW-D30 | 30KVA | 136A | 300×600×600 | 100kg |
| ZBW-D50 | 50KVA | 227A | 660×660×1400 | 140kg |
Construction & Configuration
Inside the ZBW regulator: how a CPU, an isolation transformer, and a contactless switching element replace the moving parts of a mechanical unit.
Microcomputer Control Board
An integrated circuit board with a microcomputer-grade CPU samples and processes voltage data at high speed; single-phase high-power units use a dedicated single-coil CPU processing path for improved stability.
Isolation Transformer
Shell-type isolation transformer construction, selected and engineered for reliable performance and broad load adaptability.
Contactless Zero-Crossing Switch
An electronic switching element layers a synchronized compensating sine wave onto the output at the zero-crossing point, correcting voltage without a moving contact.
Three-Phase Regulation Logic
Synchronized mode averages all three phases for balance; independent mode adjusts each phase separately; the microcomputer can auto-select between the two.
Wiring Terminal Block
L1/L2/L3 three-phase input lines, N neutral input, PE ground, and U/V/W three-phase output lines on a clearly labeled terminal block.
LCD Display & Bypass Circuit
Real-time LCD readout of input/output voltage and current, paired with a bypass circuit that can switch the load to raw utility power without interruption if needed.
Standards & Test Documentation
Performance, safety, and documentation support behind every ZBW regulator.
Voltage Regulation Performance
Maintains ±1% output precision with a ~10-millisecond response for external voltage swings greater than 10%, using 12-bit, 64-point-per-cycle digital sampling for accurate true-RMS measurement.
Protection & Fault Handling
Over-voltage and under-voltage protection activates within 1 second or switches the unit to bypass mode without interrupting the load; phase-loss, overload, and short-circuit protection are included, with an audible and visual alarm after a fault. IP20 enclosure protection for indoor installation.
OEM/ODM Technical Support
Full technical datasheets, dimensional drawings, and test reports available on request to support OEM/ODM integration and procurement evaluation.
Need Millisecond-Fast Voltage Correction?
Share your load type, phase configuration, and balance requirements — our engineering team will configure the right ZBW regulator for your project, from single-phase 3KVA units to 1200KVA three-phase systems.