Overview
The AN-5-203 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
- Half-Wave Thyristor — Proven reliable excitation for Denyo generators
- 5A Continuous Output — 120VDC max for Denyo alternators
- ±1.5% Regulation — Stable output under varying loads
- 55-200VAC Sensing — Wide detection range
- UF Protection — 17% slope down to 30Hz
- Denyo OEM Replacement — TLG-18SPY, DCA-13/15/25 series
Technical Specifications
| Parameter | Value |
|---|---|
| Type | Half-wave phase-controlled thyristor |
| Sensing Input | 55-200VAC |
| Power Input | 400VAC, 50/60Hz |
| Output Voltage | Max 120VDC |
| Output Current | Continuous 5A |
| Regulation Accuracy | <±1.5% |
| UF Protection | Slope 17% down to 30Hz |
| Excitation Type | Self-excited shunt |
| Application | Denyo TLG-18SPY, DCA-13ESK, 15ESK, 25SPK series |
Compatibility
Denyo generator alternators. Compatible with: AN-5-203.
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 TLG-18SPY / DCA-13ESK / 15ESK / 25SPK series.
Competitors NTA-5A-2DB (Denyo universal replacement).
| Parameter | AN-5-203 | NTA-5A-2DB |
| Output Current | 5A | 5A |
| Max Output Voltage | 120VDC | 63VDC |
| Regulation | ±1.5% | ±1% |
| Sensing Voltage | 55-200VAC | 190-240VAC |
| Supply Voltage | 400VAC | Standard |
| Excitation Type | Half-wave thyristor | Self-excited shunt |
| Compatibility | TLG-18SPY, DCA series | Broader |
| Price | $80-150 | $60-120 |
Selection Advice
The AN-5-203 is the Denyo OEM specified model. If the generator model is confirmed as TLG/DCA series, the AN-5-203 is the safest choice with exact OEM specification and interface matching. If the specific model cannot be confirmed, the NTA-5A-2DB offers broader compatibility, lower price, and higher regulation accuracy.
