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AS540GP Automatic Voltage Regulator
If the voltage from your generator is hunting, too high or collapsing, the AVR is the first part to check. AS540GP is a replacement regulator for Stamford alternators.
About this part
Sensitive loads such as computers, inverters and motor drives depend on a steady voltage. The regulator is a small, inexpensive board that protects everything downstream of the generator.
When to replace it
- Output voltage that is too high, too low or unstable
- No output voltage although the engine runs normally
- Lights flickering or voltage dipping as loads switch on
- A burnt or damaged board after a lightning strike or short
Before you order
Match the AVR to the alternator: sensing (single or three phase), excitation type (brushless or brush type), supply voltage and the physical mounting all have to suit. Note the wiring before disconnecting the old regulator.
Not sure it is the right one? A photo of the old part and the nameplate of the machine it came off is usually all the counter needs to confirm a match.
Questions
Will a universal AVR work on my alternator?
Often, if the sensing, excitation current and supply voltage suit. Send us the alternator make and model and the old AVR number and we will confirm.
What is an "alternative" AVR?
A regulator made to replace the original part on a specific alternator brand, at a lower cost than the brand part.
Specifications
| Part number | AS540GP |
|---|---|
| Brand | Stamford |
| Range | Automatic Voltage Regulators (AVRs) |
| Sensing Input | Voltage 95 VAC to 130 VAC 1 phase or 190 VAC to 265 VAC 1 phase |
| Power Input | Voltage: 95 VAC to 265 VAC 1 phase only |
| Regulation | ± 1.0% RMS |
| Thermal Drift | 0.03% per 1 °C change in AVR ambient temp |
| External Volatege Adjustment | ± 10% with 1 kΩ, 1 W trimmer |
| Under-Frequency Protection | Set point 94% to 98% Hz |
| Unit Power Dissipation | 12 W maximum |
| Build-up Voltage | 5 VAC at AVR terminals |
| Over-Voltage Detection | Set point - 65 VDC; Time delay - 10 s to 15 s |
Not sure it fits?
Send us the number on your old part, or a photo with the engine or alternator nameplate, and we'll confirm the match.
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