Overview
The GAVR-75A 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-75A |
| Type | Half-Wave Phase-Controlled Thyristor AVR |
| Output Voltage | Max 90VDC @ 240VAC input |
| Regulation Accuracy | ±0.5% |
| Sensing | 220/400VAC, 1-phase 2-wire |
| Frequency | 50/60 Hz |
| Output | 75A |
Compatibility
Universal large 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 30-150kW large brushless generators.
Competitors Three models tiered by current, all ±0.5% regulation.
| Parameter | GAVR-35A | GAVR-50A | GAVR-75A |
| Current | 35A | 50A | 75A |
| Frequency | 50Hz (48Hz threshold) | 50/60Hz jumper | 50/60Hz |
| Sensing | 85-139V | 220/400VAC | 220/400VAC |
| Regulation | ±0.5% | ±0.5% | ±0.5% |
| Price | $28-42 | $35-50 | $45-65 |
Selection Advice
The 35A is the first GAVR model achieving ±0.5% regulation. The 50A’s 50/60Hz jumper design makes it globally compatible. The 75A is the largest GAVR model — its current capacity can drive generators up to 150kW.
