Overview
The R450M 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
- Marine-Certified — DNV/GL approved for marine generator applications
- ±0.5% Regulation — Same precision as R450 with marine-grade components
- 6A Nominal Output — 63VDC max, 10A max for 10 seconds
- Corrosion-Resistant — Designed for harsh marine environments
- Transistor-Controlled — Fast response for marine power systems
- 85-139VAC Sensing — 50/60Hz selectable
Technical Specifications
| Parameter | Value |
|---|---|
| Sensing Input | 85-139VAC (50/60Hz) |
| Output Voltage | Max 63VDC |
| Output Current | Nominal 6A, Maximum 10A for 10s |
| Regulation Accuracy | <±0.5% |
| Frequency | 10-100 Hz |
| Excitation Type | Self-excited shunt (transistor-controlled) |
| Certification | Marine-certified (DNV/GL) |
| UF Function | 1.07 U/F (k=1) |
Compatibility
Leroy Somer alternators. Compatible with: R450M.
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 R450M: marine generators and offshore platforms. R450T: generator sets requiring independent 3-phase voltage sensing.
Competitors R450 (land-based standard version).
| Parameter | R450M | R450T | R450 |
| Classification Society Certification | Yes (DNV/GL/Lloyd’s) | No | No |
| Independent 3-Phase Sensing | No | Yes | No |
| Salt Spray Tolerance | Enhanced | Standard | Standard |
| Vibration Tolerance | Enhanced | Standard | Standard |
| Price | $300-500 | $250-400 | $220-380 |
Selection Advice The R450M is the marine version of the R450 with international classification society certification (DNV/GL/Lloyd’s etc.) and significantly enhanced salt spray and vibration tolerance. If the generator is installed on a ship or offshore platform, this is mandatory — a standard R450 would corrode and fail within 1-2 years in marine environments. The R450T adds independent 3-phase voltage sensing, suitable for large generator sets requiring precise per-phase voltage monitoring (e.g., factories with significant unbalanced loads).
