Overview
The NTA-5A-2DB is an Automatic Voltage Regulator (AVR) that maintains the generator output voltage within precise limits by controlling the exciter field current. It continuously samples the generator output voltage and adjusts excitation to compensate for load changes, engine speed variations, and temperature drift.
Key Features
- 5A Continuous Output — 63VDC max for Denyo alternators
- ±1% Regulation — Reliable voltage control
- Self-Excited Shunt — Simple, proven design
- 190-240VAC Sensing — Standard single-phase input
- Under-Frequency Protection — Built-in safety
- Denyo OEM Compatible — Direct replacement
Technical Specifications
| Parameter | Value |
|---|---|
| Type | Self-excited shunt AVR |
| Sensing Input | 190-240VAC, 1-phase |
| Output Voltage | Max 63VDC |
| Output Current | Continuous 5A |
| Regulation Accuracy | <±1% |
| Frequency | 50/60 Hz |
| Excitation Type | Self-excited shunt |
| UF Protection | Yes |
| Application | Denyo generator alternators |
Compatibility
Denyo generator alternators. Compatible with: TLG-18SPY, DCA-13ESK, 15ESK, 25SPK series.
Why Choose ZenixPower
- Tight Voltage Regulation — <±1% RMS regulation ensures stable generator output under 0-100% load transients
- Fast Response — Sub-0.5 second recovery time prevents voltage dips during motor starting and load switching
- Dual Excitation Compatibility — Self-excited shunt or PMG-powered configurations clearly labeled for correct selection
- Built-in Protections — Under-frequency roll-off, over-excitation limiting, and soft-start ramp as standard
- Drop-In Replacement — Terminal layout and mounting dimensions match STAMFORD, Leroy-Somer, Marathon, and Mecc Alte OEM AVRs
- Pre-Calibrated — Each AVR ships with factory-default potentiometer settings for immediate plug-and-play operation
Specification Comparison
Compatible Generators Denyo various diesel generator models — universal replacement.
Competitors AN-5-203 (OEM specified model).
Same as AN-5-203 table above.
Selection Advice
The NTA-5A-2DB is the recommended Denyo universal replacement — broader model compatibility than the AN-5-203, higher accuracy (±1% vs ±1.5%), and lower price. When the specific Denyo model cannot be confirmed, this is the preferred choice.
