Overview
The EA15A 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
- 15A Continuous Output — 90VDC max, 20A non-continuous for 10 seconds
- ±0.5% Regulation — Precision analog control for stable output
- 170-510VAC Sensing — Ultra-wide range covers all generator voltages
- Parallel Operation Ready — 1A/5A CT input selectable via DIP switch
- Half-Wave Thyristor — Proven reliable excitation control
- UF Protection — 95% set point with 20-second time delay
- DIP Switch Configurable — 50/60Hz and CT ratio without jumpers
Technical Specifications
| Parameter | Value |
|---|---|
| Sensing Input | 170-510VAC, 1-phase, 2-wire (DIP switch selectable) |
| Power Input | 60-300VAC, 1-phase, 2-wire |
| Output Voltage | Max 90VDC at 240VAC input |
| Output Current | Continuous 15A, Non-continuous 20A for 10s |
| Regulation Accuracy | <±0.5% (with 4% engine governing) |
| Frequency | 50/60Hz (DIP switch selectable) |
| Excitation Type | Self-excited shunt, half-wave thyristor |
| Current Transformer | 1A or 5A selectable (for parallel operation) |
| UF Protection | 95% set point, 20-second delay |
| Min Field Resistance | 5 ohms |
| Build-up Voltage | >5VAC residual at AVR terminals |
| Dimensions | 156 x 106 x 43 mm |
| Weight | 450g |
Compatibility
Universal large generator alternators.
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 100kW+ medium-to-large brushless generators requiring high excitation current.
Competitors EA16A (parallel-capable version).
| Parameter | EA15A | EA15A-2 | EA16A |
| Output Current | 15A | 15A | 16A |
| Voltage Range | 170-510VAC | 170-510VAC | Standard |
| Parallel Operation | No | No | Yes |
| Regulation | ±0.5% | ±0.5% | ±0.5% |
| Price | $40-60 | $50-70 | $70-100 |
Selection Advice
The EA15A is KUTAI’s high-current workhorse — its ultra-wide 170-510VAC voltage range covers virtually all global voltage systems from 110V to 480V. The EA15A-2 is the enhanced version with optimized internal circuitry. If parallel operation is needed, the EA16A is required.
