Overview
The SE350 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
- 3.5A Continuous Output — 73VDC max, 5A forcing at 105VDC
- ±1.0% Regulation — Consistent across full operating range
- Frequency Compensation — 54-61Hz (60Hz) or 45-51Hz (50Hz) roll-off
- Remote Voltage Adjustment — ±10% with 2000Ω rheostat
- Voltage Buildup from 10VAC — Reliable start from low residual
- Internal EMI Filter — Reduces electromagnetic interference
- Compact Encapsulated Design — 3.94″ x 2.66″ x 2.20″
Technical Specifications
| Parameter | Value |
|---|---|
| Sensing & Power Input | 190-240VAC, 500VA |
| Output Voltage | 73VDC at 3.5A DC (255W continuous) |
| Forcing Output | 105VDC at 5A DC (525W) |
| Regulation Accuracy | ±1.0% |
| Frequency Compensation | 54-61Hz (60Hz) / 45-51Hz (50Hz) |
| UF Roll-off | Adjustable |
| Remote Voltage Adjustment | ±10% with 2000Ω rheostat, ±5% with 1000Ω |
| Voltage Buildup | As low as 10VAC residual |
| EMI Suppression | Internal EMI filter |
| Fuse Protection | 4A, 250V (5x20mm) |
| Operating Temp | -40°C to +60°C |
| Storage Temp | -65°C to +85°C |
| Dimensions | 3.94″ x 2.66″ x 2.20″ (100 x 67.5 x 56 mm) |
| Weight | 6.5 oz (184g) |
Compatibility
Marathon MAGNAPLUS generators. Encapsulated design for outdoor/wet/harsh environments.
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 Marathon MAGNAPLUS 50-200kW.
Competitors BE350 (Marathon economy), DVR2000E (Marathon digital).
| Parameter | SE350 | BE350 | DVR2000E |
| Output | 3.5A | 4A | 3A |
| Control | Analog | Analog | Digital microprocessor |
| Enclosure | Fully sealed potted | Standard open-frame | Standard |
| Environmental | Excellent (outdoor/wet/salt) | Average | Average |
| Regulation | ±1% | ±1% | ±1% (digital-accurate) |
| Price | $50-80 | $40-60 | $100-150 |
Selection Advice The SE350’s key differentiator is full encapsulation potting — the entire circuit board is sealed in resin, impervious to water, dust, salt spray, and insects. In mining, construction, coastal, and tropical rainforest environments, standard open-frame AVRs (like BE350) may fail within 2-3 years from moisture/dust shorting, while the SE350 can operate reliably for 5-8 years. This explains why the SE350 costs more despite having only 3.5A (0.5A less than BE350) — it sells reliability, not current.
