• Genuine 3-Phase Sensing: Converts standard single-phase sensing AVRs into complete 3-phase monitoring systems for total generator protection
• Wide Input Voltage Taps: Multi-range voltage compatibility supporting 110V (90V–140V), 230V (200V–240V), and 400V (340V–480V) configurations
• Paralleling Voltage Droop: Built-in current transformer (CT) sensing interface for multi-generator paralleling operations
• Fine Voltage Adjustment: Features an internal voltage rheostat (P1) allowing ±5% output voltage fine-tuning
• Remote Adjustment Options: Supports external remote potentiometer connections for convenient remote voltage control
• Heavy-Duty Overload Protection: Safeguards generator excitation components from voltage spikes and load fluctuations
• Compact Modular Design: Space-saving enclosure built for fast installation inside generator terminal boxes
The Automatic Voltage Regulator R731 (AVR) by Leroy Somer is a high-precision electronic voltage control module engineered to deliver superior voltage regulation and complete 3-phase sensing for commercial and industrial diesel generators. While standard regulators only monitor single-phase power lines, integrating the Automatic Voltage Regulator R731 ensures comprehensive 3-phase monitoring across all line outputs. This prevents unmonitored voltage fluctuations, protects connected electronic loads, and ensures maximum operational reliability across healthcare centers, data infrastructure, telecommunication hubs, and industrial manufacturing plants in Bangladesh.
| Product Name | Automatic Voltage Regulator R731 (AVR) |
| Model Assignment | R731 |
| Brand Portfolio | Leroy Somer |
| Primary Function | 3-Phase Sensing & Paralleling Voltage Droop Regulation |
| High Voltage Tap (400V) | 340V -5% to 480V +5% |
| Medium Voltage Tap (230V) | 200V -5% to 240V +5% |
| Low Voltage Tap (110V) | 90V -5% to 140V +5% |
| Maximum Continuous Current | 1.3A (10A Peak for 10 seconds) |
| Voltage Adjustment Range | ±5% via Internal Rheostat (P1) / External Potentiometer Option |
| Current Sensing (CT) | 1A or 5A Paralleling CT Input for Voltage Droop (P2 Adjustment) |
| Output Configuration | AC Three Phase System Compatibility |
| HS Code / Origin | HS Code: 8503009090 | Manufactured to International Quality Standards |
| Warranty Coverage | 1-Year Standard Product Warranty |
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📥 Download Official Technical Submittal Sheet (Leroy Somer R731 PDF)
In critical alternator installations, single-phase voltage regulation can leave unmonitored phases vulnerable to unbalanced load conditions and localized voltage drops. The Automatic Voltage Regulator R731 solves this challenge by providing full 3-phase line-to-line sensing. By continuously analyzing voltage across all three phases, the Automatic Voltage Regulator R731 ensures balanced excitation control, preventing alternator overheating and safeguarding sensitive industrial machinery from severe voltage unbalances.
Built for versatile generator setups, the Automatic Voltage Regulator R731 features dedicated high, medium, and low voltage taps. This allows quick matching to 110V, 230V, or 400V power systems without complex external transformers. Additionally, the unit incorporates an active current transformer (CT) input for voltage droop regulation during paralleling operation. This allows multiple generators equipped with Leroy Somer alternators to balance reactive power seamlessly when tied to a common power bus.
Q1: What is the official price of the Automatic Voltage Regulator R731 in Bangladesh?
A: For updated pricing and delivery schedules, please contact our authorized team at Merlin Tech Ltd directly for an official commercial quote on the Automatic Voltage Regulator R731.
Q2: Why is 3-phase sensing important for the Automatic Voltage Regulator R731?
A: Standard AVRs only monitor one phase, leaving other lines unmonitored. The Automatic Voltage Regulator R731 monitors all three phases to ensure total balanced voltage control and alternator protection.
Q3: Can the Automatic Voltage Regulator R731 be used for multi-generator paralleling?
A: Yes, the unit includes a paralleling CT input and a dedicated voltage droop rheostat (P2) to ensure smooth reactive load sharing during parallel generator operations.
Q4: What input voltages are supported by the Automatic Voltage Regulator R731?
A: It supports low voltage (110V tap: 90V–140V), medium voltage (230V tap: 200V–240V), and high voltage (400V tap: 340V–480V) AC power systems.
Q5: Can I connect a remote voltage adjustment knob to this module?
A: Yes, by removing the designated jumper, you can connect an external 470 Ohm or 1k Ohm remote potentiometer for manual remote voltage adjustment.
Q6: Does the Automatic Voltage Regulator R731 come with a product warranty?
A: Yes, all genuine Automatic Voltage Regulator R731 units supplied by Merlin Tech Ltd come with a 1-year standard warranty.
Q7: Where can I buy genuine Leroy Somer AVR modules in Bangladesh?
A: You can purchase genuine Leroy Somer automatic voltage regulators and generator spare parts directly from Merlin Tech Ltd with full warranty and technical assistance.
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