The single-phase multiple winding open-type transformers is adopted for JBK3 series control transformer, the main structure is shown as follows:
1. Shell-type is used as iron core, which is laminated;
2. Winding can be two-winding or multi-winging;
3. Plug-and-socket and pressure welding styles are adopted as terminal.
Technical Specifications
| Type | Rated capacity (VA) |
Primary rated voltage (V) |
Secondary rated voltage (V) |
| JBK3-40 | 40 | 220 380 380±5% 440 |
6,24,36,110 6-24-110 36-110 127 220 380 440 |
| JBK3-63 | 63 | ||
| JBK3-100 | 100 | ||
| JBK3-160 | 160 | ||
| JBK3-250 | 250 | ||
| JBK3-400 | 400 | ||
| JBK3-630 | 630 | ||
| JBK3-800 | 800 | ||
| JBK3-1600 | 1600 | ||
| JBK3-2500 | 2500 |
| Dimensions | B | D | E | Hole | Mounting hole | |
| Type | max | max | max | K×J | ||
| A | C | |||||
| JBK3-40,63 | 83 | 85 | 90 | 56±0.4 | 46±2.5 | 4.8×9 |
| JBK3-100 | 86 | 105 | 94 | 64±0.4 | 63±2.5 | 4.8×9 |
| JBK3-160 | 98 | 105 | 109 | 84±0.4 | 71±3.0 | 5.8×11 |
| JBK3-250 | 98 | 120 | 109 | 84±0.4 | 85±3.0 | 5.8×11 |
| JBK3-400 | 122 | 105 | 125 | 90±0.4 | 85±3.0 | 5.8×9 |
| JBK3-630 | 152 | 115 | 150 | 122±0.5 | 90±3.5 | 7×13 |
| JBK3-800 | 152 | 132 | 150 | 122±0.5 | 106±3.5 | 7×13 |
| JBK3-1000 | 160 | 210 | 150 | 126±3.5 | 152±3.5 | 7×12 |
| JBK3-1600 | 184 | 235 | 165 | 146±3.5 | 176±3.5 | 7×12 |
| JBK3-2500 | 210 | 265 | 171 | 174±3.5 | 200±3.5 | 8.5×16 |

