Power transformer SET series

cast resinfor printed circuit boardslaminated

Control-Power transformers are used to supply control circuits. Their application is laid down in DIN VDE 0570/2-2 which recommends the use of control-power transformers in control circuits with more than five electromagnetic operating coils. A power supply with control transformers offers a number of benefits, for example simple matching to different mains voltages. The short-circuit currents in the control network remain at levels which are supportable for the equipment in use. In the voltage test specified in VDE 0570/2-2 the equipment in the control circuit is not subjected to the test voltage. Voltages which are different from the control voltage (e.g. 24 V) can be produced via tapping points on the control-power transformer. Voltage peaks occurring in the distribution network do not have any effect on the equipment in the control circuit. The control circuits can be operated earthed or unearthed regardless of the type of networks. Control-power transformers are manufactured with separate primary and secondary windings in accordance with VDE 0550 part 3. In the SET series the clearances and creepage distances as well as the test voltage conform to VDE 0570/2-2. Suitable measures must be taken by the user to protect against overloading and short-circuit. Control-Power Transformers to VDE 0570/IEC61558 For use as control-power and isolating transformers •Power range 63 VA – 1.5 kVA •Shell-type transformer with separate windings •Clearances and creepage distances and test voltage to VDE 0570/IEC61558 •Frequency 50/60 Hz •Prim. tap ± 5% •Base bracket mounting •Terminal blocks shockproof to VBG 4 •Insulation class ta = 40°C/B •Class of protection I