Overview
The GB-100 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
- 3A Continuous Output — 63VDC max for brush-type generators
- ±1% Regulation — Stable voltage for small generators
- Brush-Type Design — Specifically for ST-series generators
- 190-264VAC Sensing — Wide input range
- Simple & Reliable — Proven design for small generators
Technical Specifications
| Parameter | Value |
|---|---|
| Type | Self-excited shunt AVR for brush-type generators |
| Sensing Input | 190-264VAC, 1-phase |
| Output Voltage | Max 63VDC |
| Output Current | Continuous 3A |
| Regulation Accuracy | <±1% |
| Frequency | 50/60 Hz |
| Excitation Type | Self-excited shunt (brush-type) |
| Application | ST-type brush generators 1-10KW |
Compatibility
ST/STC brush-type generators 1-10kW. **For brush-type generators only — cannot be used with brushless!**
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 ST/STC brush-type generators 1-30kW. **For brush-type generators only — cannot be used with brushless!**
Competitors Three models tiered by power and excitation type.
| Parameter | GB-100 | GB-130 | GB-160 |
| Current | 3A | 4A | 10A |
| Applicable Power | 1-10kW | 10-20kW | 1-30kW |
| Excitation Type | Self-excited shunt | Self-excited shunt | Harmonic excitation |
| Sensing Voltage | 190-264VAC | 190-264VAC | 110/220VAC selectable |
| Voltage Stability | Moderate | Moderate | Best |
| Price | $10-18 | $14-22 | $18-30 |
Selection Advice
The GB-160 provides the best performance among the three — harmonic excitation delivers significantly better voltage stability than simple shunt excitation, with full power coverage from 1-30kW. The $5-10 additional cost can noticeably reduce customer returns due to voltage instability. For brush-type generator orders, the GB-160 is the recommended choice. Warning: the GB series must never be used with brushless generators — the excitation methods are fundamentally different, and incorrect application will damage equipment.
