Safety isolating transformer
STEU 20/24
Characteristics
Benefits
› Dual input voltage 230 and 400 Vac
› Very good switch-on behaviour thanks to reduced starting currents
› High power density due to a compact construction design
› Primary side ±15 V tappings for voltage adjustment
› Very good corrosion protection and low noise thanks to BLOCK IMPEX vacuum impregnation
› Quick to cable up thanks to the use of spring-clamp terminals
› Contact protected screw connection terminals complying with UVV BGV A3
› Simple mounting thanks to robust metal footplate with oval slots
› With combination footplate for bolted and rail mounting
| Product | Safety isolating transformer |
| Order number | STEU 20/24 |
| 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 / 1.48 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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