Autotransformer, three-phase
AT3 250-44/46-4
Characteristics
Benefits
› Reverse mode possible
› Very high efficiency
› Patented assembly technology to lower heat losses
› Very good corrosion protection and low noise thanks to BLOCK IMPEX vacuum impregnation
› 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 | Autotransformer, three-phase |
| Order number | AT3 250-44/46-4 |
| Power | 250,000 VA |
| Input | 3 x 440 V / 460 V |
| Output | 3 x 400 V • 361 Aac |
| Phases | 3 |
| Frequency range | 50 Hz to 60 Hz |
| Short-Circuit Losses | 918 W |
| No-Load Losses | 215 W |
| EN insulation class | F (155°C) |
| UL Insulation class | class 155 |
| Duty Cycle | 100 % |
| Wire material | Copper |
| Efficiency | 99.5 % |
General
| Short circuit proof | not short-circuit proof |
| Switching group | YNa0 |
| Cooling type | AN |
Environment
| Ambient temperature | -20 °C to 40 °C / -4 °F to 104 °F |
| Max. installation height | 2,000 m / 6,562 ft |
Protection and Safety
| Protection type | IP 00 |
| Protection class (prepared) | I |
| Degree of contamination | 2 |
Electrical Connections
| Input terminal | Screw terminal |
| Output terminal | Screw terminal |
| Terminal PE | Bolt connection |
Size and Weight
| Width | 545 mm / 21.46 in |
| Height | 505 mm / 19.88 in |
| Depth | 410 mm / 16.14 in |
| Weight | 193 kg / 425.49 lbs |
| Low Voltage Directive | EN 61558-2-13 |
| Approval cURus - Recognized | UL 1561; CSA 22.2 |
