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www.aresco.co.ilDoc. 03.02.0002E
NTA
Technical Notes and Applications
UTILIZATION CATEGORIES (TYPES) FOR FUSE-LINKS
IEC60269 and EN60269 standards comprise several utilization categories for fuse-links.
Designation of these categories are formed by two parts, first letter states the breaking range of fuse-link:
“
g
” Full range: Protection against overload and short-circuit.
“
a
” Partial range: Protection only against short-circuit.
OVERLOAD
This situation is produced when the current is slightly higher
than the “normal” current.
A typical case is when in a house we connect too much
electric devices (heaters, washing machine, dryer, etc) and
then protection operates due to the power
overload
.
SHORT-CIRCUIT
Occurs when the current is much higher than the normal
current (hundreds or thousands times higher).
This defect is produced when there is a contact between two
active parts of different potential that in normal condition
should be isolated.
Typical case could be when two conductors have a damage
in the insulation and there is a contact between them,
producing a
short-circuit
.
Second part of designation state the application of this type of fuse-link:
“G” General use
“M” Motors (or similar loads)
“R” Semiconductor protection (optimized for low I
2
t values)
“S” Semiconductor protection (optimized for low power loss)
“TR” Protection of low voltage side in distribution transformers
“PV” Photovoltaic systems
“B” Mining installations
Combining two parts, we get several categories:
Example:
gG
Protection against overload and short-circuit, general use.
aM
Protection against short-circuit in motor circuits.
aR
Protection against short-circuit for semiconductors
gR
Protection against overload and short-circuit for semiconductors (low I
2
t)
gS
Protection against overload and short-circuit for semiconductors (low power loss)
gPV
Protection against overload and short-circuit for photovoltaic systems
gTR
Protection against overload and short-circuit for distribution transformers
gB
Protection against overload and short-circuit for mining installations
Some time ago there were others types for general use (
gL
,
gF
,
gI, gII
) that have been replaced by
gG
.
gG
Breaking range:
“g”
Protection against
overload and short-circuit.
Application:
“G”
General use
מידע טכני לאופיינים של נתיכים
נתיך סכין אולטרה רפיד כולל דיודה
200KA
כושר ניתוק עד
690V
מתח עבודה
gS
אופיין
נתיכים ובתי נתיך
106685
106695
106690
CE, IEC, UL, ROHS,ISO :
תקנים
■
In the past, there were other types for general use
gL, gF, gl, gll
which replaced by
gG
.
NH1
NH1
NH1
NH1
NH1
NH2
NH2
NH2
NH2
NH2
NH3
NH3
NH3
NH3
NH3
106685
106686
106687
106688
106689
106690
106691
106692
106693
106694
106695
106696
106697
106698
106699
125A
160A
200A
250A
280A
250A
315A
355A
400A
450A
355A
400A
450A
500A
630A
106683
NH000
NH000
NH000
NH000
NH000
NH000
NH000
NH000
NH00
NH00
106675
106676
106677
106678
106679
106680
106681
106682
106683
106684
מק"ט
תיאור המוצר
20A
25A
32A
40A
50A
63A
80A
100A
125A
160A
זרם נומינלי