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FSXXXSP Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

No. de pieza FSXXXSP
Descripción Electrónicos  Industrial Control and General purpose enclosed Transformers
PDF  52 Pages
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FSXXXSP Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

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32
Control transformers
SECTION 1
recommendations for overcurrent protection
secondary
The overcurrent protection listed below, in amperes, is 125% of the rated current of the transformer. Choose
the next higher fuse rating if these numbers do not correspond with standard fuse selections.
north American standards, including Ul 508, national Electric Code 450 and the Canadian Electrical
Code Part I, require overcurrent protection on all control circuit transformers. There are two options for
overcurrent protection:
option 1
Provide an overcurrent device in the primary circuit rated to the current of the transformer. The
overcurrent limits are as follows:
Primary 9 amps or more:
no more than 125% of rated current.
Primary 2 to 9 amps:
no more than 167% of rated current.
Primary less than 2 amps:
no more than 300% of rated current for power circuits.
no more than 500% of rated current for control circuits.
This method is considered less desirable as start-up inrush to the transformer can frequently
surpass the current rating of the device and result in nuisance interruptions.
option 2
The second option is to install overcurrent devices in both the primary and secondary circuits of the
transformer. In this option, the secondary device must be rated no more than 125% of rated current
of the transformer and the primary no more than 250%. CEC permits 300% overcurrent on the
primary for this option.
In both options listed, it is recommended that time delay fuses be considered to avoid unnecessary
interruptions.
ul and Csa (nortH amerICan) standards
sec.
Voltage
Va rating
25
50
75
100
150
200
250
300
350
500
750
1000
1500
2000
3000
5000
12
2.7
5.3
7.9
11
16
21
27
-
-
-
-
-
-
-
-
-
24
1.4
2.7
4.0
5.3
7.9
11
14
16
19
27
-
-
-
-
-
-
90
0.4
0.7
1.1
1.4
2.1
2.8
3.5
4.2
4.9
7.0
11
14
21
28
-
-
95
0.4
0.7
1.0
1.4
2.0
2.7
3.3
4.0
4.7
6.6
9.9
14
20
27
-
-
100
0.4
0.7
1.0
1.3
1.9
2.5
3.2
3.8
4.4
6.3
9.4
13
19
25
-
-
110
0.3
0.6
0.9
1.2
1.8
2.3
2.9
3.5
4.0
5.7
8.6
12
18
23
-
-
115
0.3
0.6
0.9
1.1
1.7
2.2
2.8
3.3
3.9
5.5
8.2
11
17
22
-
-
120
0.3
0.6
0.8
1.1
1.6
2.1
2.7
3.2
3.7
5.3
7.9
11
16
21
-
-
220
0.15
0.3
0.5
0.6
0.9
1.2
1.5
1.8
2.0
2.9
4.3
5.7
8.6
12
18
29
230
0.14
0.3
0.5
0.6
0.9
1.1
1.4
1.7
2.0
2.8
4.1
5.5
8.2
11
17
28
240
0.14
0.3
0.4
0.6
0.8
1.1
1.4
1.6
1.9
2.7
4.0
5.3
7.9
11
16
27
© Hammond Power Solutions Inc.
Data subject to change without notice.



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