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itacoil transformers
Main transformers
UI series safety transformers
 
 
 
 
 
 
 
 
 
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For the detailed features please see the catalogue
Main transformers 50/60 Hz
power transformers STD UI39 Series
UI Standard Series (low profile)
 
This category contains the following standard series:
EI series safety Main transformers
UI series safety Main transformers - low profile

Features

Safety isolating transformers according to CEI EN61558-1(CEI 96-3) and CEI EN 61558-2-6 (CEI 96-7)
Primary and secondary windings in separate sections
Encapsulation in epoxy resin
Hot-dip tin coated phosphor bronze pins
Pin size: Max diameter = 0,90mm , Minimum length = 4mm
Laser ray marking
5KV Primary to Secondary dielectric strength
100% tested
RoHS compliant
Custom versions on request
   

size (mm)

a max

b max

h max

x typ.

x1 typ.

y typ.

c typ.

d typ.

layout

download

U3007S - 4VA

53,7

44,4

19,5

5,0

-

35

47,7

37,7

draw 1

file 3D .stp

U3010S - 6VA

53,7

44,4

22,4

5,0

-

35

47,7

37,7

draw 1

file 3D .stp

U3016S - 10VA

53,7

44,4

28,4

5,0

-

35

47,7

37,7

draw 1

file 3D .stp

U3910S - 14VA

68,6

57,7

25,3

5,0

6,0

45

62,6

50,2

draw 2

file 3D .stp

U3913S - 18VA

68,6

57,7

28,2

5,0

6,0

45

62,6

50,2

draw 2

file 3D .stp

U3917S - 24VA

68,6

57,7

31,7

5,0

6,0

45

62,6

50,2

draw 2

file 3D .stp

U3921S - 30VA

68,6

57,7

35,8

5,0

6,0

45

62,6

50,2

draw 2

file 3D .stp

U4817S - 40VA

84,0

70,4

38,8

5,0

7,0

52,5

75,0

60,4

draw 3

file 3D .stp

U4826S - 60VA

84,0

70,4

47,9

5,0

7,0

52,5

75,0

60,4

draw 3

file 3D .stp



pin side view
Layout Layout Layout Standard UI
drawing 1 drawing 2 drawing 3 dimensions


The transformers defined in the catalogue as “safety transformers” meet the harmonized European standards EN61558-1 (CEI 96-3) and EN 61558-2-6 (CEI196-7). They are manufactured with high quality material and with manufacturing processes developed in a 20 year old experience; this is guarantee of very high quality and reliability. The tests of the functional parameters and of the dielectric strength between primary and secondary windings, carried out on every single item, practically eliminate any rejects on production lines. The position of the primary and secondary windings in separated chambers and the encapsulation in epoxy resin make these transformers particularly safe and strong, both mechanically and electrically. They moreover withstand atmospheric pollution such as dust, humidity, and so on. The use of pins made of tin-plated phosphor bronze make them very resistant and very easy to weld.
The meaning of the different types of overload and short circuit protection is in compliance with the above mentioned standards and can be explained as follows:
- Inherently short-circuit proof: the transformer which undergoes a short circuit under the conditions foreseen by the standard does not reach, in the short period, temperatures which may be dangerous for the material it is made of.
- Output fuses: in order to prevent overload or short circuit from reaching dangerous temperatures, the transformer has to be protected by means of a fuse delayed by the value indicated on each secondary output; for transformers up to 30VA the fuses must comply with the standard CEI EN 60127.2.3 (e.g. series ST523 Omega); for transformers with higher power the fuse must comply with the standard CEI EN 60127.2.6 (e.g. series VT521 Omega). As in the EN61558 the primary voltage is subject to tolerances +/-10%; the rated output of the transformer shall be selected accordingly.

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