Overview
The GAVR-25A 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 Control — Reliable excitation for brushless generators
- Wide Voltage Sensing — Compatible with 220/380/440VAC configurations
- Under-Frequency Protection — Automatic voltage reduction at low RPM
- Compact Industrial Design — Durable construction for generator control panels
Technical Specifications
| Parameter | Value |
|---|---|
| Model | GAVR-25A |
| Sensing Input | 400VAC 1-phase |
| Output Voltage | Max 90VDC@240VAC input |
| Output Current | Continuous 25A |
| Regulation Accuracy | <±1% |
| Frequency | 50/60 Hz |
| Excitation Type | Half-wave phase-controlled thyristor |
| UF Protection | Yes |
| Soft Start | Yes (3 sec ramp) |
Compatibility
Universal brushless generators.
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 15-50kW brushless generators.
Competitors GAVR-20A (20A) vs GAVR-25A (25A + soft start) vs AVR-20 (20A simplified).
| Parameter | GAVR-20A | GAVR-25A | AVR-20 |
| Current | 20A | 25A | 20A |
| Soft Start Ramp | No | 3 seconds | No |
| Sensing Voltage | 160-260VAC | 400VAC | 160-260VAC |
| Price | $18-28 | $22-35 | $15-25 |
Selection Advice
For generators under 20kW, choose the GAVR-20A. For 20-50kW, choose the GAVR-25A — its 3-second soft start ramp smoothly builds voltage during generator startup, preventing voltage surges from damaging downstream equipment. The AVR-20 is a simplified version with no protection, for minimum budget use only.
