Control- and isolating transformer
STSU 250/48
Characteristics
General data
The transformers of the STSU 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
› Dual input voltage 230 and 400 Vac
› Very good inrush behavior due to reduced inrush currents
› Primary side ±15 V taps for voltage adjustment
› Touch-protected connection terminals according to UVV BGV A3
› With combination base plate for screw and rail mounting
| Product | Control- and isolating transformer |
| Order number | STSU 250/48 |
| Series | STSU |
| 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 / 8.378 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 |
