Transformers & Substations > AC Voltage Stabilizers
TNSJA Oil-Immersed Induction Voltage Regulator
Everything else in this line corrects voltage back to a fixed target — 220V or 380V, held steady. The TNSJA does something different: it’s an induction-type regulator that lets you dial output smoothly from 0V up to 430V (or 620V/1200V on higher-range builds) while the load stays connected, with no electrical contact to wear out. The coil and core sit submerged in transformer oil, vacuum-dried and vacuum-filled to keep internal moisture to a minimum, while a corrugated-fin oil tank handles thermal expansion without needing a separate oil conservator — shrinking the unit’s overall height. A non-suspended-core construction with self-locking, anti-loosening hardware on the high- and low-voltage leads is built specifically to survive transport vibration on large 30-700KVA units. This is the platform for applications that need continuously adjustable voltage under load — electric furnace control, wire and cable processing, electroplating lines, and voltage testing — not simple point-of-use stabilization.
Key Features
Built for applications that need continuously adjustable voltage under load, not just a fixed target held steady.
Oil-Immersed Construction
Coils and core are submerged in transformer oil for superior insulation and heat dissipation compared to dry-type units.
Wide, Continuously Adjustable Output
Smoothly dial output from 0V up to 430V standard (620V or 1200V configurations available) while the load remains connected.
Contactless Regulation
Induction-type regulation with no sliding electrical contact, eliminating the brush wear that limits mechanical stabilizers' service life.
Vacuum-Dried, Vacuum-Filled
Coils and core are vacuum dried, and transformer oil is vacuum filtered and injected, minimizing internal moisture.
Corrugated-Fin Cooling, No Conservator
The oil tank's corrugated fins absorb thermal expansion without a separate oil conservator, reducing overall unit height.
Transport-Ready Non-Suspended Core
Core and windings are independently fastened with self-locking, anti-loosening hardware, built to withstand transport vibration on large units.
OEM & ODM Capabilities
This platform is fully customizable — built to project-specific voltage, current, and process requirements.
Configurable Power Rating
Available from 30KVA to 700KVA, sized to your process load.
Selectable Output Voltage Range
Standard 0-430V output, or 0-620V / 0-1200V configurations for higher-voltage process applications.
Enclosure & Branding Customization
Custom enclosure finish, nameplate, and packaging available for private-label and distributor programs.
Winding Construction Options
Copper foil or copper wire low-voltage windings, multi-layer cylindrical high-voltage windings, configurable by capacity and application.
Fully Customizable Build
This product line is available fully customized to project-specific voltage, current, and mounting requirements.
Small-Batch & Bulk Production
Configurable order quantities from small-batch trial runs to full container bulk production.
Technical Specifications
Full electrical and dimensional data across the complete TNSJA / TSJA model range.
| Regulator Type | Oil-Immersed Induction-Type Contactless Voltage Regulator (Motor-Driven) |
|---|---|
| Series | TNSJA (30-700KVA) |
| Rated Input Voltage | 380V |
| Output Voltage Range | 0-430V standard (0-620V or 0-1200V configurations available) |
| Frequency | 50/60Hz |
| Insulation Resistance | >20MΩ |
| Applicable Temperature | -10°C to +45°C |
| Installation Conditions | Indoor use, altitude ≤1500m |
| Metric | Value | Notes |
|---|---|---|
| Capacity Range | 30-700KVA | TNSJA platform |
| Output Range | 0-430V (up to 1200V) | Continuously adjustable under load |
| Insulation Resistance | >20MΩ | |
| Regulation Type | Contactless Induction | No brush wear |
| Model | Capacity | Rated Output Current | Dimensions | Weight |
|---|---|---|---|---|
| TSJA-30KVA | 30KVA | 40A | — | — |
| TSJA-50KVA | 50KVA | 67A | — | — |
| TSJA-75KVA | 75KVA | 100A | — | — |
| TSJA-100KVA | 100KVA | 134A | — | — |
| TSJA-150KVA | 150KVA | 201A | — | — |
| TSJA-200KVA | 200KVA | 268A | — | — |
| TSJA-250KVA | 250KVA | 335A | — | — |
| TSJA-300KVA | 300KVA | 402A | — | — |
| TSJA-400KVA | 400KVA | 537A | — | — |
| TSJA-500KVA | 500KVA | 671A | — | — |
| TSJA-600KVA | 600KVA | 805A | — | — |
| TSJA-700KVA | 700KVA | 940A | — | — |
Construction & Configuration
Inside the TNSJA regulator: how oil immersion, vacuum processing, and a motor-driven induction mechanism deliver smooth, contactless regulation.
Silicon-Steel Core & Copper Windings
Low-voltage windings use copper foil (or copper wire on small-capacity units) in a cylindrical structure; high-voltage windings use a multi-layer cylindrical structure for balanced ampere-turns distribution, low leakage flux, and high short-circuit resistance.
Non-Suspended-Core Structure
Core and windings are independently fastened, with self-locking, anti-loosening nuts on body and lead connections, built to withstand transport vibration.
Vacuum-Dried Coil & Core Assembly
Coils and core are vacuum dried before assembly to minimize residual moisture inside the unit.
Vacuum Oil Filtration & Filling
Transformer oil is vacuum filtered and injected, keeping internal moisture to a minimum for long-term insulation reliability.
Corrugated-Fin Oil Tank
A breathing corrugated-fin design absorbs oil volume changes from temperature swings without a separate oil conservator, reducing overall height.
Motor-Driven Induction Regulation Mechanism
A drive motor smoothly adjusts the induction regulator's output under load, without a sliding electrical contact.
Standards & Test Documentation
Performance, safety, and documentation support behind every TNSJA regulator.
Regulation Performance
Delivers smooth, stepless voltage adjustment from 0V up to the configured output range while the load remains connected, using contactless induction regulation.
Insulation & Environmental Rating
Insulation resistance greater than 20MΩ; rated for indoor installation at altitudes up to 1500m.
OEM/ODM Technical Support
Full technical datasheets, dimensional drawings, and test reports available on request to support OEM/ODM integration and procurement evaluation.
Need Continuously Adjustable Voltage Under Load?
Share your process voltage range, current draw, and duty cycle — our engineering team will configure the right TNSJA oil-immersed regulator for your application, from 30KVA up to 700KVA.