25 mm round MOVs by Guiyang High-Tech Yige Electronic — In 10 kA / Imax 20 kA, with varistor voltages from 100 V to 820 V in 22 model grades.
The 25D series is a line of 25 mm round, epoxy-encapsulated zinc oxide varistors made by Guiyang High-Tech Yige Electronic Co., Ltd. for surge protective device (SPD) manufacturers and OEMs. Rated In 10 kA / Imax 20 kA (8/20 µs), the range covers varistor voltages from 100 V to 820 V in 22 model grades. The varistor discs are pressed, sintered, metallized, coated and tested in our own Guiyang plant — not bought in — which is how tolerances and surge ratings stay consistent from batch to batch. In North America, the series is supported by Flyboat Electronic LLC, the factory's sales and engineering center in Bellevue, WA.
The 25D series is not UL recognized: the catalog ratings tables for this series print the UL / C-UL / TÜV columns but leave every cell blank.
For series not yet UL recognized, we can pursue UL certification for your program.
Column definitions: U1mA = varistor voltage at DC 1 mA; ΔU1mA = varistor-voltage tolerance; UAC / UDC = maximum continuous operating voltage; In = nominal discharge current (8/20 µs); Imax = maximum discharge current (8/20 µs); UP = clamping voltage at In, shown as reference value–ratio; ETM = maximum energy absorption (2 ms). The catalog prints UL / C-UL / TÜV columns for this table but leaves them blank for every model in this series, so they are omitted here.
| Model | U1mA (V) | ΔU1mA (%) | UAC (V) | UDC (V) | In (kA) | Imax (kA) | UP (V) | ETM (J) |
|---|---|---|---|---|---|---|---|---|
| 25DK101 | 100 | ±10 | 60 | 85 | 10 | 20 | 360-3.6 | 90 |
| 25DK121 | 120 | ±10 | 75 | 100 | 10 | 20 | 400-3.6 | 110 |
| 25DK151 | 150 | ±10 | 95 | 125 | 10 | 20 | 450-3.0 | 160 |
| 25DK181 | 180 | ±10 | 115 | 150 | 10 | 20 | 490-2.8 | 140 |
| 25DK201 | 200 | ±10 | 130 | 170 | 10 | 20 | 520-2.6 | 200 |
| 25DK221 | 220 | ±10 | 140 | 180 | 10 | 20 | 550-2.6 | 220 |
| 25DK241 | 240 | ±10 | 150 | 200 | 10 | 20 | 600-2.6 | 235 |
| 25DK271 | 270 | ±10 | 175 | 225 | 10 | 20 | 680-2.6 | 270 |
| 25DK301 | 300 | ±10 | 195 | 250 | 10 | 20 | 770-2.6 | 300 |
| 25DK331 | 330 | ±10 | 210 | 270 | 10 | 20 | 830-2.55 | 330 |
| 25DK361 | 360 | ±10 | 230 | 300 | 10 | 20 | 910-2.55 | 370 |
| 25DK391 | 390 | ±10 | 250 | 320 | 10 | 20 | 1000-2.55 | 410 |
| 25DK431 | 430 | ±10 | 275 | 350 | 10 | 20 | 1050-2.45 | 460 |
| 25DK471 | 470 | ±10 | 300 | 385 | 10 | 20 | 1100-2.4 | 500 |
| 25DK511 | 510 | ±10 | 320 | 410 | 10 | 20 | 1150-2.35 | 530 |
| 25DK561 | 560 | ±10 | 350 | 450 | 10 | 20 | 1250-2.35 | 580 |
| 25DK621 | 620 | ±10 | 385 | 505 | 10 | 20 | 1550-2.35 | 630 |
| 25DK681 | 680 | ±10 | 420 | 560 | 10 | 20 | 1650-2.35 | 640 |
| 25DK711 | 710 | ±10 | 440 | 585 | 10 | 20 | 1700-2.35 | 650 |
| 25DK751 | 750 | ±10 | 460 | 615 | 10 | 20 | 1700-2.3 | 670 |
| 25DK781 | 780 | ±10 | 485 | 640 | 10 | 20 | 1750-2.3 | 690 |
| 25DK821 | 820 | ±10 | 510 | 670 | 10 | 20 | 1850-2.3 | 720 |
Notes: 25DK181’s ETM prints as 140 J in the catalog — below the 160 J printed for 25DK151 — shown as printed.
Low-clamping range, optimised for lower clamping voltage at In. Same column definitions as the standard table above.
| Model | U1mA (V) | ΔU1mA (%) | UAC (V) | UDC (V) | In (kA) | Imax (kA) | UP (V) | ETM (J) |
|---|---|---|---|---|---|---|---|---|
| 25DK431 | 430 | ±10 | 275 | 350 | 10 | 20 | 990-2.2 | 460 |
| 25DK471 | 470 | ±10 | 300 | 385 | 10 | 20 | 1070-2.2 | 500 |
| 25DK511 | 510 | ±10 | 320 | 410 | 10 | 20 | 1150-2.2 | 530 |
| 25DK561 | 560 | ±10 | 350 | 450 | 10 | 20 | 1250-2.15 | 580 |
| 25DK621 | 620 | ±10 | 385 | 505 | 10 | 20 | 1350-2.1 | 630 |
| 25DK681 | 680 | ±10 | 420 | 560 | 10 | 20 | 1520-2.1 | 640 |
| 25DK711 | 710 | ±10 | 440 | 585 | 10 | 20 | 1600-2.1 | 650 |
| 25DK751 | 750 | ±10 | 460 | 615 | 10 | 20 | 1700-2.1 | 670 |
| 25DK781 | 780 | ±10 | 485 | 640 | 10 | 20 | 1760-2.1 | 690 |
| 25DK821 | 820 | ±10 | 510 | 670 | 10 | 20 | 1800-2.08 | 720 |
Every grade has a full datasheet (electrical parameters, surge ratings, dimensions), available on request. For samples and design-in support: North America — Thomas Dong, Flyboat Electronic LLC; China — Colin Fei. See the Contact page or the buyer FAQ.
One boundary worth stating plainly: these are bare MOV components with no integrated thermal protection, and they are not drop-in replacements for thermally protected TMOV devices. Disconnection belongs to the SPD design; where a design calls for it at the device level, we supply protection modules with built-in disconnectors — see Products.
