Overview
The WT-3 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 — 100VDC max for standard alternators
- ±0.5% Regulation — High-precision analog control
- Dual Voltage System — 180-250VAC or 350-460VAC
- 10A Short-Term Capacity — 10 seconds for motor starting surges
- Under-Frequency Protection — Adjustable knee point
- Droop CT Input — Parallel operation capable
Technical Specifications
| Parameter | Value |
|---|---|
| Sensing Input | 180-250VAC (220V system) or 350-460VAC (400V system) |
| Power Input | 180-250VAC, max 1000VA |
| Output Voltage | Max 100VDC (at 240VAC input) |
| Output Current | Continuous 3A, Max 10A for 10s |
| Regulation Accuracy | <±0.5% (with 4% engine governing) |
| Frequency | 50/60 Hz |
| Excitation Type | Self-excited shunt |
| UF Protection | Yes, adjustable knee point |
| Droop CT | 0-5% at 0.8 PF |
| Min Field Resistance | 6 ohms |
| Operating Temp | -25°C to +55°C |
Compatibility
Small to medium generator alternators up to 30kW.
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 Engga brushless generators.
Competitors
| Parameter | WT-2 | WT-3 |
| Continuous Current | 6A | 3A |
| Peak Current | 15A / 1 min | 10A / 10s |
| Regulation | ±0.5% | ±0.5% |
| Voltage Selection | 180-250V or 350-460V | Same as WT-2 |
| Parallel Operation | Supports droop CT | Supports droop CT |
| Price | $50-80 | $40-60 |
Selection Advice The WT-2 is suitable for 200kW+ large excitation Engga generator sets. The WT-3 is suitable for standard power ranges. Both support parallel operation via droop CT.
