Overview
The VR6 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 for Caterpillar alternators
- ±1% Regulation — Stable output under load variations
- Self-Excited Shunt — Reliable, low-maintenance design
- Caterpillar OEM — Direct replacement for VR6
- Under-Frequency Protection — Built-in safety
- Soft Start — Smooth voltage buildup
Technical Specifications
| Parameter | Value |
|---|---|
| Type | Self-excited shunt AVR |
| Sensing Input | 190-240VAC, 1-phase |
| Output Voltage | Max 63VDC |
| Output Current | Continuous 4A |
| Regulation Accuracy | <±1% |
| Frequency | 50/60 Hz |
| Excitation Type | Self-excited shunt |
| UF Protection | Yes |
| Application | Caterpillar SR4, SR4B alternators |
Compatibility
Caterpillar SR4/SR4B alternator. Cat-specific only — no universal substitutes.
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 Caterpillar SR4/SR4B alternator. Cat-specific only — no substitutes. Price $80-120. Universal AVRs cannot be used as replacements.