Overview
The AVC63-4 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, 6A forcing for 1 minute
- Better than ±1% Regulation — Constant accuracy across full temp range
- Full-Wave Design — Improved transient performance
- Frequency Compensation — Volts-per-hertz limiting
- Overexcitation Shutdown — Protects alternator from field over-voltage
- Build-Up from 6VAC — Reliable starting from low residual
- Potted Construction — Harsh environment rated
- China RoHS Compliant
Technical Specifications
| Parameter | Value |
|---|---|
| Input Power | 95-139VAC, ±10%, 50/60Hz |
| Sensing Input | 95-139VAC ±10% or 190-277VAC ±10% |
| Output Voltage | Max 63VDC at 4A DC (252W) |
| Forcing Output | 90VDC at 6A DC (540W) for 1 minute |
| Regulation Accuracy | Better than ±1%, no-load to full-load |
| Excitation Type | Self-excited shunt |
| UF Compensation | Yes |
| Overexcitation Shutdown | 95VDC ±5%, adjustable time delay |
| Min Field Resistance | 15 ohms |
| Response Time | <1.5 cycles |
| EMI Suppression | Internal filtering |
| Operating Temp | -40°C to +60°C |
| Voltage Buildup | As low as 6VAC residual |
| Dimensions | 139.5 x 124.4 x 50.0 mm |
| Weight | 283g |
Compatibility
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 Basler-compatible generators, Stamford BC/UC series 50-200kW, most Chinese-made brushless generators.
Competitors SX460 (Stamford), EA05A (KUTAI).
Specification Comparison
| Parameter | AVC63-4 | SX460 | EA05A |
|---|---|---|---|
| Brand | Basler (USA) | Stamford (UK) | KUTAI (Taiwan) |
| Output Current | 4A cont. / 6A forcing 1 min | 4A cont. / 6A forcing 1 min | 5A cont. / 7A intermittent 10s |
| Regulation | ±1% | ±1% | ±0.5% |
| Rectification | Full-wave rectification | Half-wave thyristor | Half-wave thyristor |
| Excitation Type | Self-excited shunt | Self-excited shunt | Self-excited shunt |
| Voltage Sensing | 95-139V or 190-277V dual voltage | 190-264VAC single voltage | 220/380/440V DIP triple voltage |
| Frequency | 50/60Hz auto | 50/60Hz auto | 50/60Hz DIP selectable |
| Build-up Voltage | 6VAC residual | 6VAC residual | 5VAC residual |
| UF Protection | Yes | Yes | Yes |
| Over-Excitation Shutdown | Yes (95VDC ±5%) | No | Yes |
| Enclosure | Potted/sealed | Open-frame | Open-frame |
| Transient Response | <1.5 cycles (full-wave advantage) | <1.5 cycles | <1.5 cycles |
| EMI Filtering | Built-in | Basic | Built-in |
| Market Price | $35-55 | $25-45 | $25-38 |
Selection Advice
The AVC63-4’s key differentiators are full-wave rectification and potted construction. Full-wave rectification produces approximately 40% lower voltage ripple than half-wave designs, providing cleaner power for sensitive electronic equipment. The potted construction completely seals the circuit board in epoxy resin, protecting against moisture, dust, and vibration — particularly valuable in mining, construction sites, coastal, and high-humidity environments. Dual voltage sensing supports both 110V (US/Japan) and 220V (China/Europe/Middle East) markets with a single unit. For industrial applications with harsh operating conditions, the AVC63-4 is a more durable choice than the SX460 — the $10 additional cost translates to a 30-50% longer service life.