Isolating transformer, three-phase
TT3 20-4-4
Characteristics
General data
The isolating transformers of the TT3 series ensure safe galvanic isolation of the primary circuits from the secondary circuits. The multifunctional and widely used base brackets provide variable mounting options and facilitate top-side installation. The transformers are equipped with crane eyelets to simplify transport.
Benefits
› Isolating transformer according to EN (IEC) 61558-2-4
› Patented mounting technology to reduce heat losses
› Excellent corrosion protection and low noise emission thanks to BLOCK IMPEX vacuum impregnation
› Secondary side ±5% taps for voltage adjustment
› Fixed, touch-protected screw terminals according to UVV BGV A3
| 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 |
