GAVR-12A Universal Automatic Voltage Regulator Module: Complete Technical Guide

16. leden 2026

Pre-shipment Inspection Record: This document details the visual and technical inspection of the GAVR-12A Universal Automatic Voltage Regulator Module: Complete Technical Guide. All product photos and testing videos below are original materials captured first-hand by the Koeed technical team in our warehouse prior to dispatch.

What is the GAVR-12A?

The GAVR-12A is a universal 7 A half-wave self-excited automatic voltage regulator (AVR) for brushless generators — the module that holds the generator's output voltage flat as load moves around. The spec card shipped in the box states it directly: Universal 7 Amp 1/2 Wave Self Excited, Dip-Switch Programmable Automatic Voltage Regulator, with regulation under ±1% and a 220/400 VAC programmable input. Each unit is a sealed black case with six screw terminals (N, F+, F-, T, R1, R2) and a finned output stage. This record covers three identical units, each in its own factory box labelled Qty: 1 — PART No. PG36658Q2/G, Serial No. 60206/1035, box weight 0.315 kg, volume 13.3 × 9.5 × 6.2 cm — intake recorded 10 July 2025. Seven photos and an inspection video show these exact units, boards out of the case.

3 min readContent reviewed 8 October 2026

Part details

GAVR-12A, as read from the spec card, box label and boards
Field	Value
Type	Half-wave self-excited AVR for brushless generators, universal fitment
Field output	7 A continuous (card rating)
Input	220/400 VAC programmable via the on-board DIP-switch bank
Regulation	<±1% (card figure), with VOLT and STAB trimmers plus further blue multi-turn pots on the board
Terminals	N, F+, F-, T, R1, R2 screw terminals plus earth lug
Output stage	Finned heatsink block over the switching device; bridge rectifier module, MKP62 275 V X2 film cap and electrolytic on the power path
Protection	Red thermal breaker button, WARNING! ELECTRIC SHOCK RISK label on the case half
Board marking	GAVR-12B/A silkscreen with 57B5V3.0 revision on the PCB
Lot	3 units, each boxed Qty: 1 — PART No. PG36658Q2/G, Serial No. 60206/1035, 0.315 kg / 13.3 × 9.5 × 6.2 cm per box; intake 2025-07-10

Scroll sideways to see the full table.

Values are read from the spec card, the box labels and the photographed boards; the DIP-switch programmable input range is the card's stated feature set.

Why the universal AVR earns its shelf space

Self-excited brushless generators take their exciter power from the main stator through R1/R2, sense the output on N and T, and push field current out of F+/F- — which is exactly the terminal set this module exposes. That makes the GAVR-12A the drop-in part when the original regulator dies on a generator whose brand AVR is discontinued or overpriced: set the input range with the DIP bank, trim VOLT to the nameplate voltage, trim STAB until the engine-loaded output stops hunting, and the set is back on line. The card's under-±1% regulation figure is the class target for this topology, and the half-wave output stage under its finned block is what keeps a 7 A field fed from a board this size.

The three units in this record are identical builds, each with the Q.C. OK sticker still on the board: green solder mask, blue trimmers, the DIP block at the pot row, and the power path — bridge module, MKP62 X2 film capacitor, electrolytic — arranged along the terminal edge. One board carries the GAVR-12B/A silkscreen with the 57B5V3.0 revision, the case halves screw together with grommeted mounting ears, and every box carries the same PART No. PG36658Q2/G and Serial No. 60206/1035 label. For a regulated set that keeps tripping its AVR, a spare of this class rides in the tool box and swaps in within the hour.

Photos and video

All images below are original KOEED warehouse photos. Click any photo to view it full size.

Three factory boxes — The three factory boxes: each label reads GAVR-12A, WEIGHT 0.315KG, VOLUME 13.3 × 9.5 × 6.2CM, PART No. PG36658Q2/G, Serial No. 60206/1035, Qty: 1.

Three boards out of case — The three boards out of their cases: blue trimmer row, DIP block, Q.C. OK stickers and the finned output block beside the terminal strip.

Terminal edge close-up — The terminal edge close-up: screw terminals with earth lug, the GAVR-12B/A / 57B5V3.0 silkscreen, and the blue X2 capacitor beside the power path.

Terminal legends — The terminal legends in order: N, F+, F-, T, R1, R2 — with the finned heatsink block and the red breaker button on the case edge.

Case rear — The closed case from the rear: the moulded mounting ears with grommets — how the AVR bolts into the generator terminal box.

Power path components — The power path: bridge rectifier module on its own heatsink, MKP62 275 V X2 film capacitor, electrolytic, blue trimmers — with the WARNING! ELECTRIC SHOCK RISK label on the case half.

Units with spec cards — The three units with their spec cards: Universal 7 Amp 1/2 Wave Self Excited, Dip-Switch Programmable Automatic Voltage Regulator, <±1% Regulation, 220/400 VAC Programmable Input.

Inspection video, recorded at the Koeed warehouse before dispatch.

For the closed-loop AVR from the same shelf, see the Basler AVC125-10A1 — the Caterpillar-spec automatic voltage regulator, documented with the same warehouse-photo method.