Control- and isolating transformer
STEU 250/23
Characteristics
General data
The transformers of the STEU 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. Installation is simple and quick thanks to the innovative push-in terminal technology.
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
› High power density through a compact design concept
› 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 | STEU 250/23 |
| Series | STEU |
| Power | 250 VA |
| Input | 230 V / 400 V ± 15 V |
| Output | 2 x 115 V • 1.09 Aac |
| Phases | 1 |
| Frequency range | 50 Hz to 60 Hz |
| Short-Circuit Losses | 21.08 W |
| No-Load Losses | 10.15 W |
| Short-Term Power / instantaneous output | 850 VA |
| Short circuit voltage uk | 5.5 % |
| EN Insulation class | B (130°C) |
| UL Insulation class | class 130 |
| Duty Cycle | 100 % |
| Wire material | Copper |
| Efficiency | 88.9 % |
General
| Short circuit proof | not short-circuit proof |
| Switching group | Iii0 |
| 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 | Push-in terminal |
| Output terminal | Push-in terminal |
| Terminal PE | Flat plug connection |
Size and Weight
| Width | 96 mm / 3.78 in |
| Height | 107 mm / 4.21 in |
| Depth | 129 mm / 5.08 in |
| Weight | 3.6 kg / 7.937 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 |
Conrad Electronic SE
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