Safety isolating transformer
STEU 20/24
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
› Safety isolating transformer according to EN (IEC) 61558-2-6
› 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 | Safety isolating transformer |
| Order number | STEU 20/24 |
| Series | STEU |
| Power | 20 VA |
| Input | 230 V / 400 V ± 15 V |
| Output | 2 x 12 V • 0.83 Aac |
| Phases | 1 |
| Frequency range | 50 Hz to 60 Hz |
| Short-Circuit Losses | 3.74 W |
| No-Load Losses | 1.55 W |
| Short circuit voltage uk | 11.4 % |
| EN Insulation class | B (130°C) |
| UL Insulation class | class 105 |
| Duty Cycle | 100 % |
| Wire material | Copper |
| Efficiency | 79.1 % |
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 | 66 mm / 2.6 in |
| Height | 84 mm / 3.31 in |
| Depth | 91 mm / 3.58 in |
| Weight | 0.67 kg / 1.477 lbs |
General
| TS35 rail mounting possible | Ja |
| Low Voltage Directive | EN 61558-2-6 |
| Approval cURus - Recognized | UL 5085-1/-2; CSA 22.2 |
Conrad Electronic SE
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