Overview
The EA04C 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
- 4A Continuous Output — 63VDC max, 7A non-continuous for 60 seconds
- ±1% Regulation — Reliable voltage control for standard alternators
- Dual Sensing Range — 160-265VAC or 300-550VAC via DIP switch
- Basler Compatible — Drop-in replacement for VR63-4 / VR63-4A
- Marathon Compatible — Also replaces SE100A
- UF Protection & Overexcitation Shutdown — Dual safety features
- Parallel Ready — Compatible with KUTAI EP200 parallel module
Technical Specifications
| Parameter | Value |
|---|---|
| Sensing Input | 160-265VAC or 300-550VAC, 1-phase (DIP switch selectable) |
| Power Input | 90-270VAC, 1-phase |
| Output Voltage | Max 63VDC at 240VAC input |
| Output Current | Continuous 4A, Non-continuous 7A for 60s |
| Regulation Accuracy | <±1% (with 4% engine governing) |
| Frequency | 50/60Hz (DIP switch selectable) |
| Excitation Type | Self-excited shunt, half-wave thyristor |
| UF Protection | Yes, adjustable knee point |
| Overexcitation Shutdown | Auto shutdown at over-voltage |
| EMI Suppression | Internal EMI filter |
| Min Field Resistance | 15 ohms |
| Max Field Resistance | 100 ohms |
| Build-up Voltage | >5VAC residual at AVR terminals |
| Compatible With | Basler VR63-4, VR63-4A, Marathon SE100A |
| Dimensions | 107 x 75 x 47 mm |
| Weight | 175g |
Compatibility
KUTAI generator systems. Compatible with: EA04C.
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 Basler VR63-4/VR63-4A OEM replacement, Marathon SE100A replacement. Suitable for 50-200kW generator sets.
Competitors AVC63-4 (Basler OEM), SE350 (Marathon OEM).
| Parameter | EA04C | AVC63-4 | SE350 |
| Brand | KUTAI (Taiwan) | Basler (USA) | Marathon (USA) |
| Output Current | 4A / 7A 60s | 4A / 6A 1 min | 3.5A cont. |
| Regulation | ±1% | ±1% | ±1% |
| Voltage Sensing | DIP dual 160-265V / 300-550V | Dual voltage | Single voltage |
| Enclosure | Standard | Potted | Fully sealed potted |
| Parallel Operation | Supports KUTAI EP200 | No | No |
| EMI Filtering | Built-in | Built-in | Built-in |
| Dimensions | 107×75×47mm | 139×124×50mm | Larger |
| Price | $20-35 | $35-55 | $50-80 |
Selection Advice
The EA04C’s key feature is “one replaces two” — via DIP switch, one EA04C can replace both Basler VR63-4 and Marathon SE100A OEM models. From an inventory management perspective, SKU count is halved. Price is approximately 50-60% of OEM Basler. Note: the EA04C is not potted, so service life in harsh environments is lower than the AVC63-4 and SE350. If Basler or Marathon OEM replacement is needed but budget is limited, the EA04C is the optimal solution.
