Control- and isolating transformer
STSU 250/48
Characteristics
Benefits
› Control and isolating transformer according to EN (IEC) 61558-2-2 and EN (IEC) 61558-2-4
› Dual input voltage 230 and 400 Vac
› Very good switch-on behavior thanks to reduced inrush currents
› Primary side ±15 V taps for voltage adjustment
› Touch-protected terminal blocks according to UVV BGV A3
› With combination base plate for screw and DIN rail mounting
| Product | Control- and isolating transformer |
| Order number | STSU 250/48 |
| Power | 250 VA |
| Input | 230 V / 400 V ± 15 V |
| Output | 2 x 24 V • 5.21 Aac |
| Phases | 1 |
| Frequency range | 50 Hz to 60 Hz |
| Short-Circuit Losses | 21.7 W |
| No-Load Losses | 10.09 W |
| Short-Term Power / instantaneous output | 850 VA |
| Short circuit voltage uk | 5.4 % |
| EN insulation class | B (130°C) |
| UL Insulation class | class 130 |
| Duty Cycle | 100 % |
| Wire material | Copper |
| Efficiency | 88.7 % |
General
| Short circuit proof | not short-circuit proof |
| Switching group | Iii0 |
| Shield winding | Yes |
| 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 | Screw terminal |
Size and Weight
| Width | 96 mm / 3.78 in |
| Height | 104 mm / 4.09 in |
| Depth | 102 mm / 4.02 in |
| Weight | 3.8 kg / 8.38 lbs |
General
| TS35 rail mounting possible | Ja |
| Low Voltage Directive |
EN 61558-2-2 EN 61558-2-4 |
| Approval cURus - Recognized | UL 5085-1/-2; CSA 22.2 |
