Isolating transformer, three-phase
TT3 20-4-4
Characteristics
Benefits
› Safe galvanic isolation
› Patented assembly technology to lower heat losses
› Very good corrosion protection and low noise thanks to BLOCK IMPEX vacuum impregnation
› Secondary side ±5 % tappings for voltage adjustment
› Fixed, contact protected screw connection terminals complying with UVV BGV A3
› Multifunctional fixing rails with 12 oval slots
› Enlarged fixing rail for easy installation from above
› Integrated crane eyes
| Product | Isolating transformer, three-phase |
| Order number | TT3 20-4-4 |
| Series | TT3 |
| Power | 20,000 VA |
| Input | 3 x 400 V |
| Output |
3 x 380 V • 30.4 Aac or 400 V • 28.9 Aac or 420 V • 27.5 Aac |
| Phases | 3 |
| Frequency range | 50 Hz to 60 Hz |
| Short-Circuit Losses | 279 W |
| No-Load Losses | 255 W |
| Short circuit voltage uk | 1.5 % |
| EN insulation class | F (155°C) |
| UL Insulation class | class 155 |
| Duty Cycle | 100 % |
| Wire material | Copper |
| Efficiency | 97.4 % |
General
| Short circuit proof | not short-circuit proof |
| Switching group | Dyn5 |
| Cooling type | AN |
Environment
| Ambient temperature | -20 °C to 50 °C / -4 °F to 122 °F |
| Max. installation height | 2,000 m / 6,562 ft |
Protection and Safety
| Protection type | IP 00 |
| Protection class (prepared) | I |
| Overvoltage category | III |
| Degree of contamination | 2 |
Electrical Connections
| Input terminal | Screw terminal |
| Output terminal | Screw terminal |
| Terminal PE | Screw terminal |
Size and Weight
| Width | 550 mm / 21.65 in |
| Height | 510 mm / 20.08 in |
| Depth | 297 mm / 11.69 in |
| Weight | 204 kg / 449.742 lbs |
| Low Voltage Directive | EN 61558-2-4 |
| Approval cURus - Recognized | UL 1561; CSA 22.2 |
