30 mm square MOVs by Guiyang High-Tech Yige Electronic — In 20 kA / Imax 40 kA, varistor voltages from 100 V to 1,800 V; five grades UL 1449 Recognized under File E335803.
The 30S series is a line of 30 mm square, epoxy-encapsulated zinc oxide varistors made by Guiyang High-Tech Yige Electronic Co., Ltd. for surge protective device (SPD) manufacturers and OEMs. Rated In 20 kA / Imax 40 kA (8/20 µs), the standard range covers varistor voltages from 100 V to 1,800 V in 31 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.
| Certification wording | UL 1449 Recognized, File E335803 |
| Certificate holder | GUIYANG YIGE HI-TEC ELECTRONIC CO LTD |
| UL Product iQ category | VZCA2 (United States), VZCA8 (Canada) |
| 30S coverage | Five grades are UL 1449 Recognized under File E335803 per the UL Product iQ record: 621 / 681 / 821 / 112 / 122 (varistor voltage 620V–1200V) |
Five grades are UL 1449 Recognized under File E335803 per the UL Product iQ record: 621 / 681 / 821 / 112 / 122 (varistor voltage 620V–1200V) — models 30SK621, 30SK681, 30SK821, 30SK112 and 30SK122. The catalog ratings tables below print no certification marks for the 30S series; the recognition stated here follows the UL Product iQ record for file E335803. How to verify: go to UL Product iQ (productiq.ulprospector.com) and search file number E335803. Full coverage for all series is on the Certifications page.
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) |
|---|---|---|---|---|---|---|---|---|
| 30SK101 | 100 | ±10 | 60 | 85 | 20 | 40 | 360-3.6 | 150 |
| 30SK121 | 120 | ±10 | 75 | 100 | 20 | 40 | 400-3.6 | 185 |
| 30SK151 | 150 | ±10 | 95 | 125 | 20 | 40 | 450-3.0 | 230 |
| 30SK181 | 180 | ±10 | 115 | 150 | 20 | 40 | 490-2.8 | 270 |
| 30SK201 | 200 | ±10 | 130 | 170 | 20 | 40 | 520-2.6 | 310 |
| 30SK221 | 220 | ±10 | 140 | 180 | 20 | 40 | 550-2.6 | 350 |
| 30SK241 | 240 | ±10 | 150 | 200 | 20 | 40 | 600-2.6 | 370 |
| 30SK271 | 270 | ±10 | 175 | 225 | 20 | 40 | 680-2.6 | 430 |
| 30SK301 | 300 | ±10 | 195 | 250 | 20 | 40 | 770-2.6 | 480 |
| 30SK331 | 330 | ±10 | 210 | 270 | 20 | 40 | 830-2.55 | 520 |
| 30SK361 | 360 | ±10 | 230 | 300 | 20 | 40 | 910-2.55 | 580 |
| 30SK391 | 390 | ±10 | 250 | 320 | 20 | 40 | 1050-2.55 | 640 |
| 30SK431 | 430 | ±10 | 275 | 350 | 20 | 40 | 1150-2.55 | 730 |
| 30SK471 | 470 | ±10 | 300 | 385 | 20 | 40 | 1250-2.55 | 780 |
| 30SK511 | 510 | ±10 | 320 | 410 | 20 | 40 | 1300-2.55 | 840 |
| 30SK561 | 560 | ±10 | 350 | 450 | 20 | 40 | 1400-2.5 | 910 |
| 30SK621 | 620 | ±10 | 385 | 505 | 20 | 40 | 1550-2.5 | 990 |
| 30SK681 | 680 | ±10 | 420 | 560 | 20 | 40 | 1700-2.5 | 1000 |
| 30SK711 | 710 | ±10 | 440 | 585 | 20 | 40 | 1750-2.45 | 1010 |
| 30SK751 | 750 | ±10 | 460 | 615 | 20 | 40 | 1800-2.45 | 1020 |
| 30SK781 | 780 | ±10 | 485 | 640 | 20 | 40 | 1950-2.45 | 1030 |
| 30SK821 | 820 | ±10 | 510 | 670 | 20 | 40 | 2000-2.40 | 1080 |
| 30SK911 | 910 | ±10 | 550 | 745 | 20 | 40 | 2100-2.3 | 1170 |
| 30SK951 | 950 | ±10 | 575 | 765 | 20 | 40 | 2250-2.3 | 1180 |
| 30SK102 | 1000 | ±10 | 625 | 825 | 20 | 40 | 2300-2.3 | 1220 |
| 30SK112 | 1100 | ±10 | 680 | 895 | 20 | 40 | 2530-2.3 | 1350 |
| 30SK122 | 1200 | ±10 | 750 | 1060 | 20 | 40 | 2750-2.3 | 1400 |
| 30SK142 | 1400 | ±10 | 820 | 1120 | 20 | 40 | 3200-2.3 | 1450 |
| 30SK152 | 1500 | ±10 | 850 | 1240 | 20 | 40 | 3400-2.3 | 1500 |
| 30SK162 | 1600 | ±10 | 910 | 1320 | 20 | 40 | 3600-2.3 | 1540 |
| 30SK182 | 1800 | ±10 | 1000 | 1465 | 20 | 40 | 4000-2.3 | 1580 |
Notes: 30SK122’s UDC prints as 1060 V in the catalog — 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) |
|---|---|---|---|---|---|---|---|---|
| 30SK431 | 430 | ±10 | 275 | 350 | 20 | 40 | 950-2.2 | 730 |
| 30SK471 | 470 | ±10 | 300 | 385 | 20 | 40 | 1030-2.2 | 780 |
| 30SK511 | 510 | ±10 | 320 | 410 | 20 | 40 | 1130-2.2 | 840 |
| 30SK561 | 560 | ±10 | 350 | 450 | 20 | 40 | 1240-2.2 | 910 |
| 30SK621 | 620 | ±10 | 385 | 505 | 20 | 40 | 1350-2.15 | 990 |
| 30SK681 | 680 | ±10 | 420 | 560 | 20 | 40 | 1480-2.15 | 1000 |
| 30SK711 | 710 | ±10 | 440 | 585 | 20 | 40 | 1540-2.15 | 1010 |
| 30SK751 | 750 | ±10 | 460 | 615 | 20 | 40 | 1630-2.15 | 1020 |
| 30SK781 | 780 | ±10 | 485 | 640 | 20 | 40 | 1670-2.15 | 1030 |
| 30SK821 | 820 | ±10 | 510 | 670 | 20 | 40 | 1850-2.1 | 1080 |
| 30SK911 | 910 | ±10 | 550 | 745 | 20 | 40 | 1940-2.1 | 1170 |
| 30SK951 | 950 | ±10 | 575 | 765 | 20 | 40 | 2040-2.1 | 1180 |
| 30SK102 | 1000 | ±10 | 625 | 825 | 20 | 40 | 2200-2.1 | 1220 |
| 30SK112 | 1100 | ±10 | 680 | 895 | 20 | 40 | 2380-2.1 | 1350 |
| 30SK122 | 1200 | ±10 | 750 | 1060 | 20 | 40 | 2620-2.1 | 1400 |
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.
