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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Surface Mount Fuses
159 Fuse and Clip Series
GR 1089 AC power fault 1st level inter-building (fuse
not allowed to open)
GR 1089 AC power fault 2nd level (fuse can open but
must open in a safe and controlled manner)
Test Vrms
Short
Circuit
Current (A)
Hits Duration
Primary
Protector
Fuse
Choices
1 50 .33 1 15 min. removed 1.25, 2.0
2 100 .17 1 15 min. removed 1.25, 2.0
3
200,400,
600
1 60 1 sec. removed 1.25, 2.0
4 1000 1 60 1 sec. operative 1.25, 2.0
5 Diagram Diagram 60 5 secs. removed 1.25, 2.0
6 600 0.5 1 30 secs. removed 1.25, 2.0
7 440 2.2 5 2 secs. removed 1.25, 2.0
8 600 3 1 1.1 secs. removed 1.25, 2.0
9 1000 5 1 0.4 sec. in place 1.25, 2.0
Test
Circuite
Vrms
Short
(A)
Duration Fuse
1 120,277 25 15 min. 0.5, 1.25, 2.0
2 600 60 5 secs. 0.5, 1.25, 2.0
3 600 7 5 secs. 0.5, 1.25, 2.0
4 100-600 2.2 15 min.. 0.5, 1.25, 2.0
5 Diagram Diagram 15 min. 0.5, 1.25, 2.0
Fuse must open before wiring simulator fuse (MDL 2.0).
Test
Number
Voltage (V) Current (A) Time
Fuse
Choices
L1 600 40 1.5 secs. 0.5, 1.25, 2.0
L2 600 7 5 secs. 0.5, 1.25, 2.0
L3 600 2.2 30 min. 0.5, 1.25, 2.0
L4 200 2.2 30 min. 0.5, 1.25, 2.0
L5 120 25 30 min. 0.5, 1.25, 2.0
M1 600 40 1.5 secs. 0.5, 1.25, 2.0
M2 600 7 5 secs. 0.5, 1.25, 2.0
M3 600 2.2 30 min. 0.5, 1.25, 2.0
M4 600 2.2 30 min. 0.5, 1.25, 2.0
Selection of test number depends on current limiting F fire enclosure/spacing of end product
• 26 AWG line cord removes L1/M1 test requirement
• L5 conducted only if product does not pass section 6.1.2
• L2,M2,L3,M3,L4,M4 conducted if not in a fire enclosure
Fuse must open before the wiring simulator fuse (MDL 2.0).
UL60950 Requirements
Test Voltage
(V)
Current
(A)
Waveform Repeti-
tions
Fuse
Choices
Impulse
For
handheld
units
2500 62.5 10×700ms + 10 w/60
secs. rest
0.5, 1.25,
2.0
Non
handheld
1500 37.5 10×700ms + 10 w/60
secs. rest
0.5, 1.25,
2.0
Steady-State
For
handheld
units
1500 60Hz 0.5, 1.25,
2.0
Non
handheld
1000 60Hz 0.5, 1.25,
2.0
GR 1089 Inter-building requirements
GR 1089 1st level lighting surge inter-building
(Equipment under test can not be damaged and must
continue to operate properly)
Surge
Minimum
Peak
Voltage
(V)
Minimum
Peak
Current
(A)
Max.
Rise/Min.
Decay
(µs)
Repetitions
Each
Polarity
Fuse
Choices
1 600 100 10/1000 25 1.25, 2.0
2 1000 100 10/360 25 1.25, 2.0
3 1000 100 10/10 00 25 1.25, 2.0
4 2500 500 2/10 10 1.25, 2.0
5 1000 25 10/360 5 0.5, 1.25, 2.0
GR 1089 2nd level lightning surge telecom port
(Equipment under test shall not become a fire,
fragmentation, or electrical safety hazard)
Surge
Minimum
Peak
Voltage
(V)
Minimum
Peak
Current (A)
Max.
Rise/Min.
Decay
(µs)
Repe-
titions
Each
Polarity
Fuse
Choices
1 5000 500 2/10 1 0.5, 1.25, 2.0
Alter-
native
5000 500/8=625 8/10 1 0.5, 1.25, 2.0
If sufficient series resistance is used, then the 0.5 fuse may be used in test conditions 1-4.
The 0.5 fuse will open during these test conditions. The 1.25 & 2.0 will not open thus
providing operational compliance.
UL 60950 (EN 60950, formerly UL 1950) Power Cross Test
(L=Longitudinal, M=Metallic)
UL 60950 (EN 60950, formerly UL 1950) Impulse Test
and Steady-State Electric Strength Test