General Overview & Structural Features
General Application
The BK series miniature air-cooled dry-type control and lighting transformer is engineered for industrial AC circuits of 50–60Hz with rated input voltages of 500V and below. Manufactured in China by Yongfan Electric (YOF®), it serves as a reliable control power supply for general electrical appliances in machine tools and industrial mechanical equipment and functions effectively as a local power supply for industrial lighting and indicator lamps.
Structural Features & Wholesale Advantages
Built with advanced manufacturing processes, strict engineering design, and a practical modern structure, this series delivers consistent electrical performance, high operational reliability, and broad industrial adaptability. Capable of continuous, long-term operation at full rated load, it is an ideal voltage-transformation power supply for bulk OEM integration, commercial switchgear assembly, and wholesale distribution.
Model Designation & Nomenclature
Outline & Mounting Dimensions Diagrams
Technical Specifications, Outline & Mounting Size Datasheet
| Rated capacity (VA) |
Primary voltage (V) |
Secondary voltage (V) |
Outline size (mm) | Mounting size (mm) | |||
|---|---|---|---|---|---|---|---|
| B | D | H | A | C | |||
| 30/50 |
220
380
Or be
customized |
6, 12, 24,
36, 110,
127, 220,
380
Or be
customized |
78/84 | 70/71 | 89/94 | 56 | 51 |
| 75/100 | 84 | 83 | 90 | 65 | 60 | ||
| 150 | 102 | 91 | 110 | 76 | 60 | ||
| 200 | 102 | 102 | 110 | 76 | 71 | ||
| 250 | 120 | 108 | 126 | 90 | 78 | ||
| 300 | 120 | 113 | 126 | 90 | 83 | ||
| 400 | 150 | 100 | 152 | 110 | 72 | ||
| 500 | 150 | 110 | 152 | 110 | 82 | ||
| 750 | 150 | 140 | 152 | 110 | 107 | ||
| 1000 | 150 | 165 | 152 | 110 | 132 | ||
| 1500 | 180 | 170 | 240 | 170 | 120 | ||
| 2000 | 180 | 190 | 240 | 170 | 140 | ||
| 2500 | 180 | 210 | 240 | 170 | 160 | ||
| 3000 | 180 | 220 | 240 | 170 | 175 | ||
| 4000 | 228 | 210 | 255 | 190 | 165 | ||
| 5000 | 228 | 245 | 255 | 190 | 190 | ||
| 7500 | 300 | 220 | 320 | 250 | 265 | ||
| 10000 | 300 | 260 | 320 | 250 | 300 | ||
China Factory Direct Wholesale & Custom OEM/ODM Specification Service
Manufactured by China · Yongfan Electric Co., Ltd. (Established 2009, Dongfeng Industrial Zone, Liushi Town, Yueqing City, Zhejiang Province, China). All products are produced under ISO9001 quality management systems and CCC certification. We support custom primary/secondary voltages and private-label bulk orders.
