9
80960G_MHW_GTF_05-2019_ENG
2.6 short circuit Protection
Products listed in table “UL508 SCCR FUSES TABLE “ are suitable for use on a circuit capable of delivering not more than 100,000
A rms Symmetrical Amperes, 600 Volts maximum when protected by fuses.
Use fuses only
According to UL508, test at 100.000A were carried out with class J fuses rated xxxA (refer to table “SCCR fuse protection table” to
details of the current size fuses for the fuse).
For products complying with the UL508 standard, the use of fuses in the “UL508 SCCR FUSES TABLE” table does not guarantee the
operation of the device following a short circuit.
To guarantee the functioning of the device after the short circuit, it is recommend the use of extra rapid fuses as in table “EXTRARAPID
FUSES”.
For products GTF up to 120A, the use of fuses in the “SCCR CO-ORDINATION FUSES TABLE” guarantee the operation of the
device following a short circuit.
ATTENTION: The opening of the branch-circuit protective device may be an indication that a fault has been interrupted. To reduce the
risk of re or electric shock, current-carrying parts and other components of the device should be examined and replaced if damaged.
If burnout of the device occurs, the complete device must be replaced or equivalent.
Table 4
UL508 SCCR FUSES TABLE
GTF 200A 600V
Class J
to up 400A
GTF 250A 600V
Table 5
SCCR CO-ORDINATION FUSES TABLE
Model
Short circuit
current [Arms]
Max fuse
size [A]
Bussmann
Model Number
Max Voltage
[VAC]
GTF 25 100.000 25 DFJ-25 600
GTF 40 100.000 50 DFJ-50 600
GTF 50 100.000 50 DFJ-50 600
GTF 60 100.000 100 DFJ-100 600
GTF 75 100.000 100 DFJ-100 600
GTF 90 100.000 100 DFJ-100 600
GTF 120 100.000 125 DFJ-125 600
The fuses on the above table are representative of all the Bussmann DFJ fuses with lower current ratings
The devices protected with the fuses reported above, still be functional after the short circuit
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