Isolating transformer
STSU 40/23
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
› Isolating transformer according to 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
| Product | Isolating transformer |
| Order number | STSU 40/23 |
| Series | STSU |
| Power | 40 VA |
| Input | 230 V / 400 V ± 15 V |
| Output | 2 x 115 V • 0.174 Aac |
| Phases | 1 |
| Frequency range | 50 Hz to 60 Hz |
| Short-Circuit Losses | 5.9 W |
| No-Load Losses | 2.7 W |
| Short circuit voltage uk | 11.8 % |
| EN Insulation class | B (130°C) |
| UL Insulation class | class 105 |
| Duty Cycle | 100 % |
| Wire material | Copper |
| Efficiency | 82.3 % |
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 | 66 mm / 2.6 in |
| Height | 78 mm / 3.07 in |
| Depth | 82 mm / 3.23 in |
| Weight | 1 kg / 2.205 lbs |
General
| TS35 rail mounting possible | Ja |
| Low Voltage Directive | EN 61558-2-4 |
| Approval cURus - Recognized | UL 5085-1/-2; CSA 22.2 |
