34 mm square MOVs by Guiyang High-Tech Yige Electronic — UL 1449 Recognized, File E335803, with 31 recognized model grades from 82 V to 1,800 V varistor voltage.
The 34S series is the flagship line of 34 × 34 mm square, epoxy-encapsulated zinc oxide varistors made by Guiyang High-Tech Yige Electronic Co., Ltd. for surge protective device (SPD) manufacturers and OEMs. 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 |
| Standards | UL 1449; CSA C22.2 No. 269.5-17 (Type 5 component recognition) |
| Certificate holder | GUIYANG YIGE HI-TEC ELECTRONIC CO LTD |
| UL Product iQ category | VZCA2 (United States), VZCA8 (Canada) |
| 34S coverage | 31 model grades, varistor voltages 82–1,800 V; the 430–680 V grades are rated Imax up to 50 kA in the UL file |
How to verify: go to UL Product iQ (productiq.ulprospector.com) and search file number E335803 — the public record lists every covered model. Our MOVs are UL Recognized components for building into end products such as SPDs; they are not "UL Listed" end products. Full coverage for all series is on the Certifications page.
Models are designated 34SK followed by a three-digit code. The code gives the varistor voltage: the first two digits, followed by as many zeros as the third digit says — 431 = 430 V, 122 = 1,200 V. (The maximum continuous working voltage of each grade is a separate, lower datasheet value.)
| Model | Varistor voltage | Model | Varistor voltage |
|---|---|---|---|
| 34SK820 | 82 V | 34SK101 | 100 V |
| 34SK121 | 120 V | 34SK151 | 150 V |
| 34SK181 | 180 V | 34SK201 | 200 V |
| 34SK221 | 220 V | 34SK241 | 240 V |
| 34SK271 | 270 V | 34SK301 | 300 V |
| 34SK331 | 330 V | 34SK361 | 360 V |
| 34SK391 | 390 V | 34SK431 | 430 V |
| 34SK471 | 470 V | 34SK511 | 510 V |
| 34SK561 | 560 V | 34SK621 | 620 V |
| 34SK681 | 680 V | 34SK711 | 710 V |
| 34SK751 | 750 V | 34SK781 | 780 V |
| 34SK821 | 820 V | 34SK911 | 910 V |
| 34SK951 | 950 V | 34SK102 | 1,000 V |
| 34SK112 | 1,100 V | 34SK122 | 1,200 V |
| 34SK142 | 1,400 V | 34SK162 | 1,600 V |
| 34SK182 | 1,800 V |
The 34S square format is a standard footprint across the SPD industry, and the 34S series is widely used as a second source in existing designs. For qualification we provide full datasheets, type-test and routine-test reports for qualified OEM programs, and evaluation samples, with every shipment traceable to its production batch and delivered with a Certificate of Conformance.
One boundary worth stating plainly: the 34S is a bare MOV component with no integrated thermal protection, and it is not a drop-in replacement 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.
Every grade has a full datasheet (electrical parameters, surge ratings, dimensions), available on the 34S product page or 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.
