Control Transformers SCL Range
2Pages

Control Transformers SCL Range Data Sheet Technical data_________________________________________________ Control Transformer Standard Primary Voltages Secondary Voltages Frequency Insulation Class Insulation Resistance Dielectric Strength Ambient Temperature Class 1 Isolation Transformer with Earth Screen between Primary and Secondary IEC / BS-EN 61558 220-230-240-380-400-415V One of the following. 12V, 24V (12-0-12V), 48V, 110V(55-0-55V), 230V 50/60Hz B ˃ 5 Meg Ω Primary to Secondary. ˃ 2.5kV Primary to Earth ˃ 2.5kV Secondary to Earth ˃ 2.5kV 40° C Transformer circuit protection Transformers must be protected against short circuit and overload Primary circuit. The primary side of the Transformer should be protected against short circuit thereby cutting the supply voltage in the event of a short circuit fault. The rating of the primary protection device has to take into account the high inrush current during energizing of the Transformer. The table below gives suggested protection values to avoid nuisance tripping on inrush Rating VA 50 75 100 150 200 250 300 500 750 1000 1500 2000 2500 Secondary circuit. The secondary circuit should be protected against short circuit and overload. The value of the protection should be the same or less than the rated output curr

Watts Loss Voltage Options and Part No. Winding Primary Primary Connections 0-12V 24V Centre tapped (12-0-12V) 0-48V 110V Centre tapped (55-0-55V) 0-230V For a 100VA Transformer with an output of 110V the Part Number would be SCL100110 Power Rating Calculation To choose the size of Transformer required for an application the total inrush VA must be calculated. This figure is then applied to the table above with the maximum allowable voltage drop taken into account. eg. For a calculated inrush of 2100VA the appropriate Transformer is as follows 1) For 10% drop in output volts during inrush....