Safety isolating transformer
ST 20/23/24
Characteristics
Benefits
› Very good switch-on behaviour thanks to reduced starting currents
› High power density due to a compact construction design
› Primary side ±5 % tappings for voltage adjustment
› Very good corrosion protection and low noise thanks to BLOCK IMPEX vacuum impregnation
› Contact protected screw connection terminals complying with UVV BGV A3
› Simple mounting thanks to robust metal footplate with oval slots
Product | Safety isolating transformer |
Order number | ST 20/23/24 |
Power | 20 VA |
Input | 219 V / 230 V / 241 V |
Output | 24 V • 0.83 Aac |
Phases | 1 |
Frequency range | 50 Hz to 60 Hz |
EN insulation class | B (130°C) |
UL Insulation class | class 105 |
Duty Cycle | 100 % |
Wire material | Copper |
Efficiency | 81 % |
General
Short circuit proof | not short-circuit proof |
Switching group | Ii0 |
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 | 2 |
Electrical Connections
Terminal Pri | Screw terminal |
Terminal Sec | Screw terminal |
Terminal PE | Flat plug connection |
Size and Weight
Width | 66 mm / 2.6 in |
Height | 81 mm / 3.19 in |
Depth | 56 mm / 2.2 in |
Weight | 0.9 kg / 1.98 lbs |
Low Voltage Directive | EN 61558-2-6 |
Approval cURus - Recognized | UL 5085-1/-2; CSA 22.2 |
VDE Approval |
VDE 0570-2-x (DIN EN 61558-2-x) |