Basler Electric AVC63-12 Analog Voltage Regulator

A rugged 12-amp analog voltage regulator that fits one device on the shelf

The Basler Electric AVC63-12 is a potted, analog automatic voltage regulator with a PWM power stage that delivers 63 Vdc at 12 Adc continuous. Basler describes the AVC line as the universal regulator that reduces inventory to one device on the shelf, because jumpers select single-phase or three-phase sensing, 1X or 2X V/Hz limiting and the nominal sensing voltage.

It holds voltage within plus or minus 0.5 percent of setpoint, stays accurate up to 20 percent THD from six-SCR loads, and responds in under 4 ms. The AVC63-12 shares its bulletin with the AVC125-10, a 125 Vdc at 10 Adc sibling; this page covers the AVC63-12 only.

AVC63-12 features

• Voltage regulation accuracy +/-0.5 percent, held to 20 percent THD
• 63 Vdc at 12 Adc continuous output; 125 Vdc forcing at 24 Adc for ten seconds
• 1X or 2X V/Hz limiting (jumper selectable) with selectable slope characteristics
• Single-phase or three-phase average sensing (jumper selectable); 1 A or 5 A paralleling CT input
• Nominal sensing 120 or 240 V, 50/60 Hz or 400 Hz; power from shunt connection or PMG at 50 to 400 Hz
• Overexcitation shutdown, accessory input and internal EMI filtering
• Automatic voltage buildup from residual voltage as low as 6 Vac; potted for harsh environments

AVC63-12 technical specifications

Input power and output

Sensing and regulation

Environmental, mechanical and approvals

AVC63-12 or AVC125-10?

Choose by the exciter field. The AVC63-12 supplies up to 12 Adc at 63 Vdc with a minimum field resistance of 5.25 ohm; the AVC125-10 supplies 10 Adc at 125 Vdc for fields of 12.5 ohm minimum. Then set the sensing range (95 to 139 V or 180 to 264 V) and frequency option (50/60 Hz or 400 Hz) at order. For smaller exciters Basler lists the AVC63-4 and AVC63-7 families, and we also quote the AVC63-4A separately. Send the generator nameplate and the old regulator label for a check.

Installation and adjustment notes

The regulator is potted, so mount it in the generator terminal box or a control panel with the field wiring, sensing and optional external voltage adjustment rheostat connected according to the connection diagram in the instruction manual. Choose single-phase or three-phase sensing and the V/Hz setting with the jumpers before the first run. Overexcitation shutdown trips on field voltage after a delay, so check exciter field resistance against the 5.25 ohm minimum before connecting.

Where the AVC63-12 fits

It is a retrofit and spare-part item for brushless or PMG-excited generators on diesel and gas sets, and for sets that must work with nonlinear loads such as six-SCR loads, since accuracy holds to 20 percent THD. The -40 C to 70 C operating range is the printed rating; for generator terminal boxes in Gulf summers, confirm the actual box temperature against it.

Installation and selection notes

Set the jumpers for single or three-phase sensing, the V/Hz limiting and the nominal voltage before powering the regulator, and confirm the field voltage and current of the generator. Mount the potted unit securely, keep the sensing and field wiring separate where the manual advises and follow the wiring diagram for the machine.

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

Listed with the regulator: the AVC63-4, AVC63-4D, AVC63-7 and AVC63-7F regulators, DECS-150 and DECS-250 digital systems, DGC-2020ES and DGC-2020HD genset controllers, BE1-FLEX and ES Series protection relays.

Frequently asked questions

What is the AVC63-12 output rating?

63 Vdc at 12 Adc continuous, with 24 Adc at 125 Vdc for ten-second forcing.

How accurate is the regulation?

+/-0.5 percent of setpoint, accurate up to 20 percent THD from six-SCR loads.

Can it sense three phases?

Yes. Jumpers select single-phase or three-phase average sensing.

What power sources can it use?

Shunt connection or a PMG operating from 50 to 400 Hz.

Is Seven Star LLC a Basler Electric distributor?

No. Seven Star LLC supplies Basler Electric products as an independent company in Muscat, Oman, and does not act as a manufacturer-appointed distributor.

Documents and quotation

To request a quote, send the full model or order code, any options and the quantity. The reference document, the AVC63-12 and AVC125-10 product bulletin (SVL-17, 01-24), is attached to this page; please check the style code against it and the manual. Seven Star LLC is an independent supplier based in Muscat and ships Basler Electric products around the GCC on enquiry. Prices are quoted individually, and specifications should be confirmed with current manufacturer data. Browse Diesel Generator Spare Parts or the Basler Electric brand page.