Getra Geräte- und Trafobau - Qualität seit 1968

Control –Power Transformers

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.

In order to match the voltage our control-power transformers are equipped on the primary side with +5% and -5% taps. Control-power transformers must be connected downstream of the main switch in the particular installation, preferably between two phase conductors and suitable measures must be taken to protect against short-circuiting. Voltages up to max. 250 V, preferably 230 V, are possible at the output of the control-power transformers. The main factors dictating the size are the rated power and the short-time rating. The values specified for the short-time rating are the values of the output power at cos. phi 0.5 at which the output voltage can permissibly drop by 5% compared with the nominal value.

Control-Power Transformers SET 63VA - 1,5kVA

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
Type of protection IP00

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Control-Power Transformers SUL 1 - 6kVA

Control-Power Transformers to VDE 0570/2-2/IEC61558/2-2

Power range 1 - 6 kVA
Core-type transformer with separate windings
Frequency 50/60 Hz
Prim. Tap ± 5%
Base bracket mounting
Terminal blocks shockproof to VBG 4
Betriebslage SUL 1 SUL 2 beliebig
Operating position SUL1, SUL2 any position,
SUL2.5 – SUL6 magnetic axis vertical
Insulation class ta = 40° C/B
Class of protection I
Type of protection IP00

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Control-Power Transformers SEU 100 - 1000VA

Universal Control-Power Transformers to
VDE 0570/2-2/IEC61558/2-2

Power range 100 - 1000 VA
Shell-type transformer with separate windings
Frequency 50/60 Hz
Input voltages 200-220-230-240-360-380-400-420-
440- 460-480-500-530-550 V
Output voltages 230 V ± 5%
Other output voltages by arrangement
Additional preferred voltages are 110 V, 42 V and 24 V
Base bracket mounting
Terminal blocks shockproof to VBG 4
Insulation class ta = 40°C/B
Class of protection I
Type of protection IP00

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GETRA´s success is no secret.

Our principle was and is to act in a forward-looking manner. In doing so, we attach a great deal of importance to quality and an optimal price performance ratio. We have high standards when it comes to our products, which are of course built and tested in line with the requirements of the VDE and DIN guidelines, and for this purpose, we have certified our quality management system according to ISO 9001!