Control- and isolating transformer
ST 250/69/23
Characteristics
General data
The transformers of the ST series ensure safe galvanic isolation of the primary circuit from the secondary circuit. The unique BLOCK IMPEX vacuum impregnation process provides excellent protection against external influences while reducing noise levels. The robust metal base plate with elongated holes ensures easy and secure mounting.
Benefits
› Control and isolating transformer according to EN (IEC) 61558-2-2 and EN (IEC) 61558-2-4
› Very good inrush behavior due to reduced inrush currents
› High power density through a compact design concept
› Primary side ±5% taps for voltage adjustment
› Touch-protected connection terminals according to UVV BGV A3
| Product | Control- and isolating transformer |
| Order number | ST 250/69/23 |
| Series | ST |
| Power | 250 VA |
| Input | 655 V / 690 V / 725 V |
| Output | 230 V • 1.09 Aac |
| Phases | 1 |
| Frequency range | 50 Hz to 60 Hz |
| Short-Circuit Losses | 20.3 W |
| No-Load Losses | 8.2 W |
| Short-Term Power / instantaneous output | 555 VA |
| Short circuit voltage uk | 7.4 % |
| EN Insulation class | B (130°C) |
| Duty Cycle | 100 % |
| Wire material | Copper |
| Efficiency | 89.8 % |
General
| Short circuit proof | not short-circuit proof |
| Switching group | Ii0 |
| 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 |
| Overvoltage category | III |
| Degree of contamination | 1 |
Electrical Connections
| Input terminal | Screw terminal |
| Output terminal | Screw terminal |
| Terminal PE | Plug-in connection |
Size and Weight
| Width | 96 mm / 3.78 in |
| Height | 101 mm / 3.98 in |
| Depth | 106 mm / 4.17 in |
| Weight | 3.9 kg / 8.598 lbs |
| Low Voltage Directive |
EN 61558-2-2 EN 61558-2-4 |
