Transformers & Substations > AC Voltage Stabilizers
SJW3 Three-Phase Industrial Voltage Regulator
The SJW3 is a third-generation three-phase industrial AC voltage regulator built for heavy-duty power correction from 1.5KVA up to 120KVA. A regulation circuit, control circuit, and servo motor work together — sampling, comparing, and amplifying voltage deviations, then driving the servo motor to reposition the carbon brush and automatically adjust the coil turns ratio to hold output steady. Pure copper coil and compensation winding construction, a high-torque servo motor drive, and dual 1017 carbon brushes deliver accurate, non-derated power output, while six-way protection and continuous cooling keep the unit running reliably in demanding industrial environments. Available across the full SJW3 platform with OEM/ODM configuration options.
Key Features
Third-generation upgrades that keep the SJW3 delivering accurate, reliable three-phase power correction under heavy industrial loads.
Six-Way Protection
Over-voltage, under-voltage, over-temperature, overload, short-circuit, and delay protection safeguard the regulator and connected industrial equipment.
Pure Copper Coil + Compensation Winding
Full pure-copper coil with automatic wire winding keeps each turn tight and regular, delivering accurate regulation without power derating.
Upgraded Smart LCD Display
One-touch switching between input and output voltage readings on an upgraded intelligent display screen.
High-Torque Servo Motor Drive
Powerful, fast-responding servo motor delivers stable operation, high regulation precision, and long service life.
Dual 1017 Carbon Brushes
High-quality dual carbon brush design improves conductivity and regulation accuracy.
Strong-Duty Cooling Fan
Continuously operating fan maintains airflow inside the cabinet, preventing sustained temperature rise under heavy load.
OEM & ODM Capabilities
Built-to-order three-phase regulation for distributors, system integrators, and B2B industrial partners.
Configurable Power Rating
Available from 1.5KVA to 120KVA across the SJW3 platform — sized to your industrial load.
Custom Input Voltage Window
Standard 260-450V three-phase four-wire + ground input, configurable to match your site's grid conditions.
Enclosure & Branding Customization
Custom enclosure finish, nameplate, and packaging available for private-label and distributor programs.
Mobile & Fixed Cabinet Options
Configurable with caster wheels for mobile deployment or fixed floor-mount installation.
Flexible Protection Configuration
Under-voltage protection available as an optional add-on; other protection thresholds adjustable 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 dimensional data across the complete SJW3 model range.
| Regulator Type | Third-Generation Three-Phase Automatic Voltage Regulator (Servo-motor Driven) |
|---|---|
| Series | SJW3 (1.5-120KVA) |
| Rated Input Voltage | 260-450V |
| Rated Output Voltage | 380V, three-phase four-wire + ground |
| Regulation Precision | ±3% |
| Frequency | 50/60Hz |
| Applicable Load | Any load type, no additional waveform distortion |
| Installation Conditions | Indoor use, altitude ≤1500m, -15°C to 40°C |
| Metric | Value | Notes |
|---|---|---|
| Capacity Range | 1.5-120KVA | SJW3 platform |
| Response Speed | ≤1.5s | >10% voltage change |
| Protection Rating | IP20 | Indoor installation |
| Cooling Method | Self-cooling / Air-cooling | Model dependent |
| Model | Capacity | Rated Current | Product Dimensions (L×W×H mm) | Net Weight | Packing Dimensions (mm) | Packing Weight |
|---|---|---|---|---|---|---|
| SJW3-1500VA | 1.5KVA | 2.27A | 480×320×175 | 14KG | 545×380×243 | 18KG |
| SJW3-3000VA | 3KVA | 4.55A | 485×320×175 | 15KG | 545×380×243 | 18.5KG |
| SJW3-4500VA | 4.5KVA | 6.8A | 485×320×175 | 16KG | 545×380×243 | 19.5KG |
| SJW3-6KVA | 6KVA | 9.1A | 307×275×673 | 25KG | 365×325×745 | 29KG |
| SJW3-10KVA | 10KVA | 15.2A | 490×320×525 | 35.5KG | 540×382×535 | 42KG |
| SJW3-15KVA | 15KVA | 22.7A | 490×320×525 | 41KG | 540×382×535 | 46KG |
| SJW3-20KVA | 20KVA | 30.3A | 490×320×525 | 47.5KG | 540×382×535 | 55KG |
| SJW3-30KVA | 30KVA | 45.5A | 465×415×880 | 91KG | 515×468×1005 | 100KG |
| SJW3-40KVA | 40KVA | 60.7A | 460×410×880 | 106.5KG | 515×468×1005 | 116KG |
| SJW3-50KVA | 50KVA | 75.9A | 560×450×1195 | 136KG | 610×510×1455 | 151KG |
| SJW3-60KVA | 60KVA | 91.1A | 560×450×1195 | 145KG | 610×510×1455 | 158KG |
| SJW3-80KVA | 80KVA | 121.5A | 625×525×1345 | 162KG | 680×580×1500 | 180KG |
| SJW3-100KVA | 100KVA | 151.9A | 625×525×1345 | 186KG | 680×580×1500 | 204KG |
| SJW3-120KVA | 120KVA | 182.3A | 625×525×1345 | 203KG | 680×580×1500 | 221KG |
Construction & Configuration
Inside the SJW3 regulator: how the regulation circuit, servo motor, and copper coil assembly work together to hold three-phase voltage steady.
Voltage Regulation Circuit
Samples, compares, and amplifies input voltage and load deviations to determine the correction needed.
Automatic Control Circuit
Processes the regulation circuit's signal and drives the servo motor to correct output voltage in real time.
High-Torque Servo Motor
Repositions the carbon brush along the coil winding to adjust the turns ratio and restore rated output.
Pure Copper Coil & Compensation Winding
Automatically wound, tightly spaced pure-copper coil assembly with a dedicated compensation winding for accurate, non-derated power delivery.
Dual 1017 Carbon Brush Assembly
Front and rear carbon brushes maintain precise, stable contact with the coil for accurate voltage regulation.
Upgraded LCD Display & Cooling Fan
Smart display with one-touch input/output voltage toggle, paired with a continuously operating cooling fan for sustained thermal management.
Standards & Test Documentation
Performance, safety, and documentation support behind every SJW3 regulator.
Voltage Regulation Performance
Maintains ±3% output precision with ≤1.5-second response for external voltage swings greater than 10%, backed by six-way protection (over-voltage, under-voltage, over-temperature, overload, short-circuit, delay).
Dielectric Withstand & Protection
Rated to withstand a 1500V power-frequency sine wave for 1 minute without puncture or flashover; 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 Reliable Three-Phase Power Regulation?
Share your load profile, voltage requirements, and cabinet configuration — our engineering team will configure the right SJW3 regulator for your industrial project, from single units to bulk OEM/ODM orders.