Clinch Versions
(1 Hole and No Holes variants)
littelfuse.com
MEGA
+
®
Fuse Rated 32V
The MEGA
+
®
Fuse is designed for high current circuit protection up to 500A with “Diffusion
Pill Technology.” The MEGA+
®
Fuse also provides time delay characteristics. Designed
and patented by Littelfuse, the MEGA+
®
Fuse is ideal for battery and alternator protection
application and other heavy gauge cables requiring ultra-high current protection.
High Current Fuses
Specifications
Interrupting Rating: 2000A @ 32VDC
Voltage Rating:
32VDC
Recommended Environmental Temperature: -40˚C to + 125˚C
Housing Material:
Terminals Material:
Net Weight Per Fuse:
M6 Mounting Torque:
M8 Mounting Torque:
Refers to:
PET-GF30FR (U.L. 94 Flammability rating - V-0)
Tin Plated Copper Alloy
11.6±15% gr
8-14Nm - Recommended Range Value
12-18Nm - Recommended Range Value (25Nm Max Allowed)
(ISO prescription 12±1Nm)
ISO
8820-5
Bolt Down Versions
Time-Current
Characteristic Curves
Littelfuse
®
products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
®
product documentation. Warranties granted by Littelfuse
®
shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse
®
documentation. Littelfuse
®
shall not be liable for any claims or
damages arising out of products used in applications not expressly intended by Littelfuse
®
as set forth in applicable Littelfuse
®
documentation. The sale and use of Littelfuse
®
products is subject to Littelfuse Terms and Conditions of
Sale, unless otherwise agreed by Littelfuse
®
.
0.01
0 .1
1
10
1 00
1000
1 00 00
10 1 00 1000 1 00 00
T
T
i
i
m
m
e
e
[
[
s
s
]
]
C
C
u
u
r
r
r
r
e
e
n
n
t
t
[
[
A
A
]
]
150A
175A
80A
125A
40A
60A
100A
250A
200A
225A
0.01
0 .1
1
10
1 00
1000
1 00 00
1 00 1000 1 00 00
TTiimmee [[ss]]
CCuurrrreenntt[[AA]]
450A
350A
400A
500A
300A
(5a)
(5b)
REV06222021
Ordering Information
Part Number Rating
Package
Size
Bolt
Size
Bolt
Hole
Qty
0298XXX.UXP-2M8 40 - 500 500 M8 2
0298XXX.UXP-1M8 40 - 500 500 M8 1
0298XXX.UXP-2M6 40 - 500 500 M6 2
0298XXX.UXP-1M6 40 - 500 500 M6 1
0298XXX.UXP-NH 40 - 500 500 N/A 0
Time-Current Characteristics
% of
Rating
Opening Time Min / Max (s)
40A-250A 300A 350A-500A
75 – / – 14,400 / ∞ 14,400 / ∞
100 14,400 / ∞ – / – – / –
135 120 / 1800 – / – – / –
150 20 / 450 – / – – / –
200 1 /15 1 / 15 1 / 15
350 0.3 / 5 0.5 / 5 0.5 / 5
500 – / – 0.1 / 2 0.1 / 2
600 0.1 / 1 0.1 / 1 – / –
Ratings
Part Number Current Rating
(A)
Color Code
4
Test Cable
size
(mm
2
)
Typ. Voltage
Drop at 100% lr
(mV)
Typ. Cold
Resistance
(mΩ)
Melting I
2
t
(A
2
s)
0298040._
1
40 4 86.9 1.52 6,600
0298060._
1
60 6 88.5 0.95 22,200
0298080._ 80 10 77.1 0.66 22,900
0298100._ 100 16 85.9 0.55 27,600
0298125._ 125 16 79.0 0.41 78,000
0298150._ 150 25 90.9 0.34 97,300
0298175._ 175 25 77.3 0.28 205,500
0298200._ 200 35 92.8 0.26 245,800
0298225._ 225 35 83.5 0.21 135,300
0298250._ 250 50 85.8 0.19 176,200
0298300._
2
300 70 45.3
3
0.16 378,900
0298350._
2
350 70 48.2
3
0.13 573,000
0298400._
2
400 70 52.0
3
0.12 844,400
0298450._
2
450 70 58.3
3
0.11 1,323,600
0298500._
2
500 70 57.5
3
0.09 1,850,200
0.01
0.1
1
10
100
1000
10000
10 100 1000 10000
TIME [s]
CURRENT [A]
TIME-CURRENT CHARACTERISTIC CURVES (RECORDED@23°C)
80A
125A
100A
60A
70A
Note 1: Not mentioned in ISO standards
Note 2: Short Circuit Protector only
Note 3: Voltage Drop measurements for short circuit protectors taken at 75% of rated current.
Note 4: Color Code Applicable for the UXP-2M8 and UXP-2M6 versions only - Not applicable for UXP-1M6, UXP-1M8 and UXP-NH clinch versions that
have the High Contrast Mark (White Color Only)
0.01
0 .1
1
10
1 00
1000
1 00 00
10 1 00 1000 1 00 00
TTiimmee [[ss]]
CCuurrrreenntt[[AA]]
150A
175A
80A
125A
40A
60A
100A
250A
200A
225A
0.01
0 .1
1
10
1 00
1000
1 00 00
1 00 1000
1 00 00
T
T
i
i
m
m
e
e
[
[
s
s
]
]
C
C
u
u
r
r
r
r
e
e
n
n
t
t
[
[
A
A
]
]
450A
350A
400A
500A
300A
(5a)
68.6
M6: Ø6.6
M8: Ø8.6
M6: Ø6.6
M8: Ø8.6
50.8
29.2
19
16.3
9.69 (40A-250A)
9.89 (300A-500A)
0.8 (40A-250A)
1 (300A-500A)
25.40
littelfuse.com
Littelfuse
®
products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
®
product documentation. Warranties granted by Littelfuse
®
shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse
®
documentation. Littelfuse
®
shall not be liable for any claims or
damages arising out of products used in applications not expressly intended by Littelfuse
®
as set forth in applicable Littelfuse
®
documentation. The sale and use of Littelfuse
®
products is subject to Littelfuse Terms and Conditions of
Sale, unless otherwise agreed by Littelfuse
®
.
High Current Fuses
MEGA
+
®
Fuses Rated 32V
Typical Derating Of Fuse Melting Element
Temperature Security Margin is 20%
Please Contact Littelfuse
®
For Details Regarding Derating Test Set Up
max. allowed current load [A] at ambient temperature (typical derating)
-40°C 0°C 20°C 65°C 85°C 110°C 125°C
40A
40 40 40 35 32 27 24
60A
60 60 57 49 44 38 33
80A
80 80 80 68 62 53 46
100A
100 100 94 80 72 61 54
125A
125 121 114 97 88 75 65
150A
150 137 130 111 101 86 76
175A
175 160 151 127 115 98 86
200A
196 178 168 143 130 111 98
225A
214 194 183 155 141 120 105
250A
240 217 204 172 155 131 114
300A
225 225 225 212 191 162 141
350A
263 263 263 235 213 180 157
400A
300 298 281 237 214 181 158
450A
338 338 333 280 252 213 185
500A
375 360 340 288 261 222 194
Temperature Table
REV06222021
WITH CURRENT TAB NAMES
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180
Max. Allowed Current Load [A]
Ambient Temperature [°C]
300A
350A
400A
450A
500A
Dimensions
Dimensions in mm for reference only. See outline drawing for dimensions and tolerances
Marking Type “A”
Color Code Rating Mark Applicable for the UPX-2M8 and UPX-2M6 versions only
Marking Type “B”
High Contrast Mark (White Color Only - No Color Code) applicable for UPX-1M6,
UPX-1M8 and UPX-NH clinch versions
68.6
M6: Ø6.6
M8: Ø8.6
M6: Ø6.6
M8: Ø8.6
50.80
29.21
19.05
2X 16.26
9.69 (40A-250A)
9.89 (300A-500A)
0.8 (40A-250A)
1 (300A-500A)
(25.4)
UXP-1M6 & UXP-1M8 versions
UXP-NH version
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
-40 -3 0 -20 -1 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 16 0 17 0 18 0
Max. Allowed Current Load [A]
Ambient Temperature [°C]
4 0A
6 0A
8 0A
100A
125A
150A
1 75
200A
225A
250A
Derating curves may change depending on the final condition of the application (terminals
characteristics, wire size exc..). Please ask Littelfuse
®
for more information.