Fuse links
01
SloFast fuse link
Product description
A comparison of the time-current curves of the JEC SloFast fuse link with those of conventional fuse links and the safe-loading time current characteristics for distribution transformers illustrates the application potential of the SloFast fuse links. The rather unusual current rating assigned to SloFast fuse links is an aid in their application since the current rating assigned is identical to the continuous current rating of the transformers which they were specifically designed to protect.
If the SloFast link is used in place of ordinary links, the full overload capacity of the transformer is made available, but at the same time the transformer is protected from faults and overloads which could either destroy or shorten its life expectancy. SloFast is the perfect match for transformer protection.
System Protection
When a heavy fault occurs within the transformer primary bushings, a SloFast link clears the transformer from the system before damage can occur, and before any other protective device can operate and cause an unnecessary interruption to any other segment of the system.
Transformer Portection
Secondary temporary faults that can be withstood by a transformer will not rupture a SloFast fuse link. If secondary faults persist and become dangerous, the SloFast link will operate, preventing damage to the transformer.
Size of Fuse Elements
|
Rated current (A) |
Dimensions (mm) |
||||
|
A |
B |
C |
D |
F |
|
|
1-20 |
12.5±0.2 |
19.0 ± 0.2 |
12/27KV: 530-600
33/38KV: 787 |
1.25-1.9 |
7.6 |
|
25-40 |
12.5±0.2 |
19.0 ± 0.2 |
2.2-2.55 |
7.6 |
|
|
50-80 |
19.0±0.3 |
not applicable |
2.85-4.0 |
10.0 |
|
|
100~200 |
19.0±0.3 |
not applicable |
4.5-5.2 |
11.8 |
|
Technical Parameters
|
Melting Speed Ratio |
SloFast type: 13~30 |
|
Rated Current |
0.4, 0.6, 0.7, 1, 1.3, 1.4, 1.6, 2.1, 3.1, 3.5, 4.2, 5.2, 6.3, 7.8, 10.4, 14, 21, 25, 31.5A |
|
Standard |
IEC 60282-2 |
|
Environmental Conditions |
Ambient Temperature: -30℃ - +40℃ Altitude: 3000m Frequency: 50Hz / 60Hz Maximum Wind Speed: 35m/s |
JEC SloFast fuse links are made in complete accordance with standards ANSI/NEMA.
Precision — The standard of JEC fuse links
JEC SloFast Fuse Links assure system protection because they are precision manufactured. The fusible materials used in JEC Fuse Links are under continual control during manufacture. Pre-tested to guarantee their electrical values, these materials are held to precise tolerances. At critical points during the manufacturing process, rigid inspections are made.
Structure of Fuse Elements
Packaging
JEC fuse links come in protective plastic bags with perforations to facilitate quick, easy opening even when lineman’s gloves are worn. Each bag remains completely sealed for all-weather protection and keeps the links protected in the line truck’s bins.
Type and amperage is printed on each bag, for easy identification.
Picture
