N Series
SINGLE PHASE CAST RESIN TRANSFORMER FOR CONTROL, ISOLATION AND SAFETY
25 ÷ 5000 VA
Ratings
Voltage
range
Primary
Secondary
6 / 12 V
12 / 24 V
230 / 400 / 460 V
24 / 48 V
115 / 230 V
Voltage selection by means of metal connection bridges, offering the full rated power at any
selected combination of input and output voltages.
Applications
•
Control Transformer: Transformer able to supply a high instantaneous power without voltage drop at the output. Very
suitable for interlocking contactors, relays and electro valves, as well as adaptation of the mains voltage to the
necessary supply voltage of the loads.
• Isolation Transformer: Transformer with secondary voltage > 50 V, with double or reinforced isolation between primary and
secondary. Its construction provides an excellent degree of attenuation of electrical distortions. Recommended for:
- Electronic equipment, PLC’s and automation systems.
- Auxiliary elements in electrical panels.
- Linear and switching power supplies.
Eliminates the risk of human accidents in case of unipolar contacts.
• Safety Transformer: Transformer with secondary voltage < 50 V, with double or reinforced isolation between primary
and secondary. Eliminates any risk of human accidents in case of unipolar or bipolar contacts.
Standards
•
•
•
•
IEC 61558 / EN 61558 / UNE-EN 61558 (certified)................................................................... Control, Isolation and Safety
UL 506 ....................................................................................................................................... Control, Isolation and Safety
IEC 60742 / EN 60742 / UNE-EN 60742 (certified) ................................................................................ Isolation and Safety
IEC 60989 / EN 60989 / UNE-EN 60989 ................................................................................................................... Control
Characteristics
• Frequency ............................................................................................................................................................ 50 - 60 Hz
• Protection degree ..................................................................................................................................................... IP - 205
• Ambient temperature ( ta ) ................................................................. + 45 º C (IEC 61558, UL 506, IEC 60742, IEC 60989)
+ 25 º C (IEC 60742, IEC 60989)
• Humidity (without condensation ) ............................................................................................................................ < 95 %
• Safety class ...................................... .......................................................................................................................... Class I
• Installation .................................................................................................................................................................. Indoor
• Operation ............................................................................................................................................................ Continuous
• Test voltages :
- between Primary and Secondary ..................................................................................................................... 4600 V
- between Primary and Earth .............................................................................................................................. 3200 V
- between Secondary an earth ........................................................................................................................... 2500 V
• Voltage drop at nominal power .................................................................................................................................... < 5 %
• External covering ......................................................................................................................................................... Resin
• Isolation .............................................................................................................................................. Class B-130º C ( IEC )
Class 105 ( UL )
• Windings ................................................................................................................... Copper HC-200º C (double enamelled)
• Refrigeration ................................................................................................................................................. (AN) Natural Air
• Terminals ............................................................................................................................. Screws with supporting washers
• Earthing ................................................................................................................................ connection on transformer base
1
N Series
SINGLE PHASE CAST RESIN TRANSFORMER FOR CONTROL, ISOLATION AND SAFETY
• Cast Resin construction: robust and resistant casting system, suitable for application in humid, marine and corrosive environments as well as
under unfavourable vibration conditions.
• Fast mounting system: support for mounting on DIN rail 35 x 7,5 mm (EN 50022) on transformers up to 100 VA, simplifying mounting in
electrical panels and cabinets.
• Separation of connections: by means of isolating resin partitions.
• Protection of connection terminals: by means of polycarbonate cover ( V-2 according to UL94 ) avoiding accidental electrical contacts.
Dimensions
Reference
φ
Rating
25
40
63
100
160
200
250
315
400
500
630
1000
1600
2000
2500
3150
4000
5000
25
40
63
100
160
200
250
315
400
500
630
1000
1600
2000
2500
3150
4000
5000
A
B
50
50
75
75
84
96
96
108
108
126
126
150
150
195
195
195
240
240
mm
97
97
96
96
102
112
112
122
122
145
145
165
165
198
198
198
235
235
No load
voltage
No load
losses
Short circuit
losses
(100ºC)
Vo
Po
PK ( * )
Mounting
C
74
84
85
100
110
106
116
125
135
147
167
180
210
228
248
268
280
300
φ
D
E
80
80
80
80
86
96
96
106
106
125
125
145
145
178
178
178
212
212
mm
34
34
56
56
65
77
77
89
89
102
102
125
125
173
173
173
218
218
Efficiency
(100ºC)
6
6
6
6
6
6
6
6
6
7
7
7
7
7
7
7
7
7
Short circuit
voltage
(100ºC)
Maximum
weight
kg
0 76
0,95
1,3
1,8
2,7
3,2
3,7
4,7
5,4
7,1
9,1
13,3
16,9
25,3
30,5
35,8
47,7
55
Maximum
conductor
size
ta = + 25 ºC
ta = + 45 ºC
Instantaneous
power cos θ =
0,5
VA
VA
VA
%
W
W
%
%
mm
25
40
63
100
160
200
250
315
400
500
630
1.000
1.600
2.000
2.500
3.150
4.000
5.000
20
25
40
63
100
160
200
250
315
400
500
630
1.000
1.600
2.000
2.500
3.150
4.000
43
66
117
174
373
494
607
967
1.256
1.613
2.440
3.967
5.436
6.576
9.509
13.711
13.444
15.125
10
10
10
8
7.2
6.4
5.6
4.8
4
3.2
2.8
2.6
2.5
2.4
2.4
2.3
2.3
2.2
34
4.9
4.5
6.8
9.5
8.8
11
10.9
12.9
13.9
19.7
18.8
26.5
38.9
47.2
56
63.5
76.9
39
5.0
10.7
11.0
16.1
19.1
21.2
22.4
24.2
27.3
25.4
37.7
55.6
57.0
63.2
65.9
84.7
96.0
77 4
80.2
80.6
84.9
86.2
87.8
88.6
90.4
91.5
92.4
93.3
94.4
95.0
95.4
95.8
96.3
96.4
96.7
15 5
12.3
16.8
11.3
9.6
8.4
7.7
6.5
5.9
5.1
4.0
3.8
3.6
3.2
2.7
2.3
2.6
2.5
6
6
6
6
6
6
6
6
6
16
16
16
16
16
16
16
16
16
Reference
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
Overall
η
(*)
UK ( * )
2
( * ) the indicated values correspond to the power at ta = +25 ºC. For +45 ºC a correction has to be applied by multiplication with 0.63 of the PK and with 0.8 of the UK.
2
N Series
SINGLE PHASE CAST RESIN TRANSFORMER FOR CONTROL, ISOLATION AND SAFETY
References of standard transformers
Rating
Primary voltage
ta = + 25 º C
ta = + 45 º C
VA
VA
V
25
40
63
100
160
200
250
315
400
500
630
1.000
1.600
2.000
2.500
3.150
4.000
5.000
20
25
40
63
100
160
200
250
315
400
500
630
1.000
1.600
2.000
2.500
3.150
4.000
230 / 400
230 / 400
230 / 400
230 / 400
230 / 400
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
230 / 400 / 460
Secondary voltage
6 / 12 V
12 / 24 V
24 / 48 V
115 / 230 V
References
NA 25
NB25
NC25
ND25
NA 40
NB40
NC40
ND40
NA 63
NB63
NC63
ND63
NA100
NB100
NC100
ND100
NA160
NB160
NC160
ND160
NA200
NB200
NC200
ND200
NB250
NC250
ND250
NB315
NC315
ND315
NB400
NC400
ND400
NB500
NC500
ND500
NC630
ND630
NC1000
ND1000
NC1600
ND1600
NC2000
ND2000
NC2500
ND2500
ND3150
ND4000
ND5000
Ordering special transformers
The N series transformers are available in special executions, with special voltages, special power ratings, distribution of power ratings,
regulations , electrostatic screens , etc . When ordering, specify the characteristics different from the standard ones and following reference:
Reference
NS
Voltage selection system
Example:
To select a supply voltage
400 V, place the metal bridge
between terminal 2 - 3 and
connect the supply cables to
terminals 1 and 5.
Reference
NA
NB
NC
ND
V21
6V
12 V
24 V
115 V
V22
12 V
24 V
48 V
230 V
In case the transformer is a
NA
, and bridges are placed
between terminals 6 - 7 and
between terminals 8 - 9, an
output voltage of 6 V ( V21 ) is
obtained between terminals 7
and 8.
The connection bridges for the voltage
selection
are
delivered
with
each
transformer.
3
N Series
SINGLE PHASE CAST RESIN TRANSFORMER FOR CONTROL, ISOLATION AND SAFETY
Protection type and rating
A ) Protection at the primary side of the transformer :
The supply circuit of the transformer should only be protected against short circuits, by means by a protection with rating of at least 2
times the nominal current of the transformer due to the inrush current of the transformer (about 20 times I nominal during 10 ms) .
PRIMARY
Reference
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
25
40
63
100
160
200
250
315
400
500
630
1000
1600
2000
2500
3150
4000
5000
230 V
Rating
0 25
0.40
0.63
1
1.6
2
2.5
3.15
4
5
6
10
16
20
25
32
40
50
400 V
Type
T
T
T
T
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
Rating
0 125
0.20
0.315
0.50
1
1
1.25
1.6
2
2.5
3.15
5
8
10
12.5
16
20
25
460 V
Type
T
T
T
T
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
Rating
-----1
1.25
1.6
2
2.5
3.15
5
8
10
12.5
16
20
25
Type
-----D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
D , aM
T : T type, temporised fuse
aM : aM type fuse
D : magnetic circuit breaker, curve D
B ) Protection at the secondary side of the transformer :
The secondary side of the transformer should be protected against overloads, by means of a protection rated equal or inferior to the
secondary current of the transformer.
SECONDARY
Reference
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
25
40
63
100
160
200
250
315
400
500
630
1000
1600
2000
2500
3150
4000
5000
6V
Rating
4
6
10
16
25
32
-------------
12 V
Type
gG C
gG , C
gG , C
gG , C
gG , C
gG , C
-------------
Rating
2
3.15
5
8
12.5
16
20
25
32
40
---------
Type
gG C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
---------
24 V
Rating
1
1.6
2.5
4
6
8
10
12.5
16
20
25
40
63
80
100
----
Type
gG C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
----
T : T type temporised fuse
gG : gl – gG type fuse
C : magnetic circuit breaker curve C
48 V
Rating
0 50
0.80
1.25
2
3.15
4
5
6
8
10
12.5
20
32
40
50
----
Type
T
T
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
----
115 V
Rating
0 20
0.315
0.50
0.80
1.25
1.6
2
2.5
3.15
4
5
8
12.5
16
20
25
32
40
Type
T
T
T
T
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
230 V
Rating
0 10
0.16
0.25
0.40
0.63
0.80
1
1.25
1.6
2
2.5
4
6
8
10
12.5
16
20
Type
T
T
T
T
T
T
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
gG , C
4
N Series
SINGLE PHASE CAST RESIN TRANSFORMER FOR CONTROL, ISOLATION AND SAFETY
Determination of a control transformer
For calculation and selection of a transformer to be used for control and interlocking, following data is necessary:
1º_ Σ VA maint. The sum of the maintenance power ratings of all elements: contactors, relays, electro valves, signal lights, etc...
2º_ Σ VA conn. The maximum sum of the connection power ratings of the elements that trip simultaneously during switching
operations.
3º_ cos ϕ maint. and conn. of each of the elements of the switching sequence.
A ) Calculation for transformer selection, example:
In the example, the maintenance power rating is the sum of the total VA maint. of the three contactors and the maximum sum of the
connection power ratings is occurring when during a switching operation the biggest contactor trips.
Main data:
Maintenance
During connection
cos ϕ conn.
Number of contactors
VA maint.
cos ϕ maint.
VA conn.
2
1
10
62
0,28
0,25
68
860
0,8
0,41
Consider cos ϕ = 0,5 when not known
Calculation:
•
•
VA total = Σ VA maint. + Σ VA conn.
VA total = (10+10+62) + 860 = 942 VA
•
W total = Σ [VA maint. x cos ϕ maint.] + Σ [VA conn. x cos ϕ conn.]
W total = [ (10x0,28) + (10x0,28) + (62x0,25) ] + (860x0,41) = 373,7 W
•
cos ϕ = W total / VA total
cos ϕ = 373,7 / 942 = 0,40
Instantaneous power
cos ϕ (when not coinciding, use the one immediate superior)
B ) Using the table for transformer selection:
In line cos ϕ (0,40), look for the instantaneous power value equal or immediate superior to the calculated total instantaneous power (1138
VA) in order to obtain the transformer reference. In case of the example, the reference of the transformer to be used is N 315. Check that the
transformer power rating is superior to the Σ VA maint. of the contactors, signal lights and other elements to be supplied by the transformer.
cos ϕ
13750
11921
14235
39
61
94
132
286
377
460
726
939
1205
1814
2944
4562
5661
8330
12100
12410
14622
41
63
105
146
316
417
508
803
1038
1331
2003
3244
4736
5783
8417
12253
12191
14892
43
66
117
174
373
494
607
967
1256
1613
2440
3967
5436
6576
9509
13711
13444
15125
46
71
130
202
434
576
711
1138
1481
1903
2888
4708
6065
7192
10276
14756
14152
15817
50
80
140
235
502
668
829
1333
1736
2232
3399
5550
6612
7695
10876
15613
14578
16026
57
98
173
291
615
823
1033
1681
2204
2840
4353
7160
7974
9115
12770
18127
16632
18264
N 5000
12670
11388
N 4000
11663
7769
N 3150
7947
5238
N 2500
5290
4158
N 2000
4112
2531
N 1600
2345
1563
N 1000
1447
1042
N 630
963
813
N 500
751
630
N 400
581
401
N 315
369
330
N 250
304
251
N 200
231
115
N 160
106
90
N 100
85
58
N 63
55
37
N 40
Transformer
reference
35
N 25
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
Instantaneous Power (VA)
5