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Brand: Basler Electric
Basler Electric AVC63-4A Analog Voltage Regulator
Description
A compact 4-amp analog regulator for small generator terminal boxes
The Basler Electric AVC63-4A is a small, rugged analog voltage regulator with integrated circuitry. Its exciter field output is 4 A continuous and 6 A forcing, and the full-wave power stage gives improved transient performance and voltage stability. At 283 g and 139.5 x 124.4 x 50 mm it is small enough for installation in virtually any generator terminal box.
Basler states regulation accuracy better than plus or minus 1 percent from no-load to full-load, with a response time under 1.5 cycles for a 5 percent change in sensing voltage, and performance that stays constant over the operating temperature range without derating.
AVC63-4A features
- Regulation better than +/-1 percent, no-load to full-load
- Exciter field current 4 A continuous, 6 A forcing
- Frequency compensation and volts-per-hertz limiting
- Overexcitation shutdown when exciter field voltage exceeds 95 Vdc +/-5 percent
- Internal EMI suppression and automatic voltage buildup from residual voltage as low as 6 Vac
- Potted construction for harsh environments
- Simple adjustments to reduce settings errors
AVC63-4A technical specifications
Power input and output
| Parameter | Specification |
|---|---|
| Voltage buildup | Automatic, from residual voltage as low as 6 Vac |
| Exciter field resistance | 15 ohm minimum, 100 ohm maximum |
| Power dissipation | 15 W maximum |
| Ten-second forcing | 134 Vdc at 9 Adc (1,206 W) |
| One-minute forcing | 90 Vdc at 6 Adc (540 W) |
| Maximum continuous output | 63 Vdc at 4 Adc (252 W) |
| Input power (1-phase) | 95 to 139 Vac, +/-10 %; 50/60 Hz; burden 450 VA |
Sensing and regulation
| Parameter | Specification |
|---|---|
| Overexcitation shutdown | After time delay if exciter field voltage exceeds 95 Vdc +/-5 % |
| EMI suppression | Internal EMI filtering |
| Response time | Under 1.5 cycles for a +/-5 % change in sensing voltage |
| Regulation accuracy | Better than +/-1 %, no-load to full-load |
| Sensing input (1-phase) | 95 to 139 Vac +/-10 %, or 190 to 277 Vac +/-10 %; 50/60 Hz |
Environmental, mechanical and compliance
| Parameter | Specification |
|---|---|
| Compliance | China RoHS compliant |
| Size (W x H x D) | 139.5 x 124.4 x 50.0 mm (5.49 x 4.90 x 1.97 in) |
| Mass | 283 g (10 oz) |
| Vibration | 5 to 26 Hz 1.2 G; 27 to 52 Hz 0.036 in double amplitude; 53 to 1,000 Hz 5 G |
| Shock | 20 G in three perpendicular planes |
| Operating / storage temperature | -40 C to 60 C (-40 F to 140 F) / -40 C to 85 C (-40 F to 185 F) |
Matching the AVC63-4A to the exciter
The AVC63-4A suits exciter fields with a resistance of 15 to 100 ohm and a 4 A continuous demand. If the field needs more current, Basler lists the AVC63-7 and AVC63-12; the AVC63-4 and AVC63-4D are related variants. Confirm the sensing range (95 to 139 Vac or 190 to 277 Vac) and the single-phase power source voltage, since this model uses single-phase input and sensing only. Send the alternator model and the old regulator label if you are replacing a unit.
Installation notes
Wire the regulator following the connection diagram in the manual: power, sensing, exciter field, and the optional external adjustment potentiometer. The datasheet shows terminal markings including F+, F-, 3, 4, E3, V1, V2 and the Hz jumpers; short them as the notes direct for 50 Hz or 60 Hz operation, and fit the fuses with the required interrupting capacity. Frequency compensation curves and overexcitation delay curves are printed in the datasheet for setting up.
Where the AVC63-4A fits
It is a spare and replacement item for small and medium brushless generators with single-phase excitation power,. Its 60 C maximum operating temperature is lower than the 70 C of larger AVC models, so check the terminal-box temperature on hot sites.
Installation and selection notes
Because the regulator is small, it can fit in many terminal boxes, but check the wiring and the field current against the 4 A continuous rating. Use the supplied wiring diagram, adjust the voltage and stability settings with the generator running at no load and then at load, and record the final settings.
Information needed for a quotation
Send the full model code, the quantity, the delivery location in Oman or the GCC, the site conditions and any accessories needed, so that the complete package can be quoted together.
Documents and supply information
The manufacturer data sheet is attached to this page and should be read together with the project specification before a purchase is confirmed. Ratings, flows, dimensions and certifications are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.
Related Basler Electric items
Basler lists the AVC63-12, AVC63-4, AVC63-4D, AVC63-7 and AVC63-7F regulators, the DECS-150 digital excitation system, the DGC-2020, DGC-2020ES and DGC-2020HD genset controllers, BE1-FLEX and ES Series protection relays.
Related Basler Electric products: Basler Electric AVC63-12 Analog Voltage Regulator, Basler Electric BE2000E Digital Voltage Regulator, Basler Electric DGC-2020 Digital Genset Controller, Basler Electric DECS-450 Digital Excitation Control System, Basler Electric DGC-2020HD Digital Genset Controller and Basler Electric DECS-250 Digital Excitation Control System.
Documents and quotation
This listing carries the AVC63-4A product bulletin (SVD-12, 01-24) for reference. Use it with the manual to confirm the correct order code, then send the code, options and quantity via the quote form. Seven Star LLC works from Muscat as an independent supplier for GCC customers, and prices are provided on request only. Always confirm ratings, options and approvals against the latest manufacturer documents. See Diesel Generator Spare Parts and the Basler Electric brand page for related items.
Datasheets & Documents
- Datasheet Basler Electric AVC63-4A product bulletin (SVD-12, 01-24) Download
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About brand
Basler Electric is an American maker of excitation, voltage regulation, generator control and protection products, founded in 1942 by Carl Basler in his father's garage in Highland, Illinois. Early work was rewinding and repairing electrical equipment, followed by custom transformers from 1945 and the SRA voltage regulator in 1959. Basler has plants in Highland, Taylor (Texas), Piedras Negras (Mexico) and Suzhou (China), and Littelfuse completed its acquisition of the company in December 2025.
Seven Star LLC is an independent supplier in Muscat. We list Basler Electric regulators and controllers for generator owners, packagers and power plants in Oman and the GCC.
Basler Electric company profile
| Founded | 1942, Highland, Illinois, USA, by Carl Basler |
|---|---|
| Headquarters | Highland, Illinois |
| Ownership | Littelfuse, since December 2025 |
| Manufacturing | Highland, Taylor (Texas), Piedras Negras (Mexico), Suzhou (China) |
| Product families | DECS-150, DECS-250, DECS-250E and DECS-450 digital excitation control systems, AVC and SR analog voltage regulators, DGC-2020 and DGC-2020HD genset controllers, BE1 protection relays, transformers |
Milestones
- 1942: Carl Basler starts the business in Highland.
- 1945: Custom transformer production begins.
- 1959: The SRA voltage regulator is introduced.
- 2025: Littelfuse completes the acquisition of Basler Electric.
Basler Electric product series
Digital excitation control systems include the DECS-150, DECS-250, DECS-250E and DECS-450, which regulate generator voltage, reactive power and power factor. Voltage regulators include the AVC63-4A and AVC63-12 analog regulators and the BE2000E digital regulator, common replacements on brushless generators.
The DGC-2020 and DGC-2020HD digital genset controllers handle engine start, metering, protection and paralleling, and the BE1-11g is a multifunction generator protection system.
Where Basler Electric controls are used
Stand-by and prime power gensets and larger synchronous generators and motors in oil and gas, petrochemical, power, water and construction projects across the Gulf.
Basler Electric products we list
Ordering Basler Electric parts: what we need
Send the full model and style code from the nameplate, the generator rating, voltage and excitation type, the control power supply and the existing regulator or controller being replaced. We match each request to the manufacturer bulletin before quoting.
Facts checked against Basler Electric's own company history page and Littelfuse's December 2025 announcement, October 2026.
Browse Basler Electric products by category: Diesel Generator Spare Parts.
FAQ
Questions about the Basler Electric AVC63-4A Analog Voltage Regulator
Answers from our engineering team on installation, compatibility and integration.
01What is the AVC63-4A output?
63 Vdc at 4 Adc continuous, 90 Vdc at 6 Adc for one minute and 134 Vdc at 9 Adc for ten seconds.
02Is it single-phase or three-phase?
Single-phase input and sensing; the sensing range is 95 to 139 Vac or 190 to 277 Vac.
03How fast does it respond?
Under 1.5 cycles for a 5 percent change in sensing voltage.
04What field resistance does it need?
Between 15 ohm minimum and 100 ohm maximum.
05Is Seven Star LLC a Basler Electric distributor?
No. Seven Star LLC is not a Basler Electric distributor; it is an independent Muscat supplier that obtains genuine Basler Electric products against customer enquiries.
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