Type MJS
MJSD0903
5 x 15mm Glass Tube
Lightning Surge Withstand Fuse
m
Catalog
Number
Ampere
Rating
Typical
Volt-drop Melting I
2
T Melting I
2
T Peak Surge Current (Amp) Maximum
Power
Cold
@10
In
@100%
In
< 10 mSec
(fig B)
(Fig A)
Dissipation
Resistance
l es
5 P ses
(A
2
Sec)
10
2
S x
ul
000uS
1050 Pu5s60uS
(W)
(ohm)
(Volt) max. (A
2
Sec)
uS x
u
1
MJS
Fuses are primarily intended for
use in telecommunication circuit applica-
tions requiring low current protection with
high surge tolerance. They are typically
used to replace heat coil type devices.
They are designed to be placed between
the line input and the surge arresting components (mov, gas tube, zenor
diode, air gaps, etc.)
These fuses will withstand transient surge currents generated by
lightning in accordance with the attached table.
MJS
fuses guard protected circuitry against sustained overload or
short circuit conditions. Such sustained overloads may be generated by
accidental contact between utility cables and phone lines (power line
cross).
MJS
Fuses are used in circuits to obtain compliance with the test
requirements specified in UL 1950/60950 and Bellcore 1089.
MJS 100
MJS 125
MJS 150
MJS 200
MJS 250
MJS 350
MJS 400
MJS 500
MJS 700
MJS 750
MJS 1
MJS 1.25
MJS 1.5
MJS 2
MJS 2.5
MJS 3
MJS 3.5
MJS 4
MJS 5
MJS 6
MJS 7
100mA
125mA
150mA
200mA
250mA
350mA
400mA
500mA
700mA
750mA
1A
1.25A
1.5A
2A
2.5A
3A
3.5A
4A
5A
6A
7A
11.00
7.62
5.28
3.66
2.54
1.46
1.22
0.84
0.525
0.487
0.281
0.195
0.135
0.094
0.065
0.045
0.037
0.031
0.022
0.015
0.012
1.55
1.35
1.17
1.02
0.89
0.72
0.67
0.59
0.49
0.48
0.39
0.34
0.29
0.26
0.22
0.19
0.18
0.17
0.15
0.13
0.12
0.068
0.11
0.17
0.26
0.41
0.80
0.99
2
3
3
6
9
14
23
35
55
69
86
135
211
263
0.088
0.14
0.22
0.34
0.53
1.03
1.29
2
4
4
8
12
19
30
47
73
91
114
179
279
350
4.5
5.6
6.8
9
12
18
20
26
38
38
56
75
94
120
150
195
225
255
330
428
488
6.0
7.5
9.0
12
16
24
27
35
50
50
75
100
125
160
200
260
300
340
440
570
650
0.22
0.24
0.27
0.30
0.34
0.40
0.42
0.47
0.54
0.55
0.64
0.71
0.80
0.89
0.99
1.10
1.16
1.22
1.40
1.50
1.60
Electrical Characteristics
(UL/CSA STD.248-14)
Testing Current
100%
135%
200%
500%
1000%
Blow Time
Minimum
Maximum
4 Hrs.
N/A
N/A
1 Hr
3 sec
20 sec
100 msec
1.5 sec
30 msec
300 msec
Approvals
Safety Agency Approvals
Vßpc
Amp range / Volt @ I.R. ability
100mA
.
- 7A / 125V AC@ 10,000A
100mA
.
- 7A / 250V AC@ 200A
1A
.
- 5A / 125V AC@ 500A
V
ß
p
Listed File no. E20624
Certified File no. LR39772
File no. JET1037-31003-1003
Consult manufacturer for other ratings
FIG A
FIG B
Power Cross Rating
600V ac, 40A
Operating Temperature
-55ºC to +125ºC
See P.4 for explanation of Peak Surge Current Withstand
Mechanical Dimensions
0.59"±0.02"
1.50"±0.08
"
(38.1±2.0mm
)
(15.0±0.5mm)
0.217"±0.004"
(5.5±0.1mm)
Physical Specification
Specifications subject to change without notice
Materials
Glass body / Nickel Plated Brass Caps
Lead wire: Tin-lead plated Copper, Diameter 0.032"
Option
With Heat Shrink Tubing (VW-1) over body
Marking
On fuse: “bel”, “MJS”, “Current Rating”, “250V” &
“Appropriate Safety Logos”
On label: Above info plus “c” and interrupting rating
Packaging
1. In bulk: 500 pcs per box
2. On Axial Tape & Reel: 1,500 pcs per reel
3. Tape & Reel specification: per EIA-296-E & IEC 286-1
@ 10mm Pitch and 52.4mm inside Tape Spacing
MJS
SEE LEAD SIZE IN “MATERIAL”
0.710"±0.080"
(18.0±2.0mm)
0.590"±0.020"
(1.5±1.0mm)
0.244"±0.008"
(6.2±0.2mm)
WITH INSULATION SLEEVE
ORDERING INFORMATION SEE PAGES 67 & 68
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel: 201-432-0463 • Fax: 201-432-9542 • E-Mail: belfuse@belfuse.com
Website: www.belfuse.com
33
Type MJS
Lightning Surge Withstand Fuse
5 x 15mm Glass Tube
MJSC0801
MJS - TIME CURRENT CHARACTERISTIC CURVE
-
150mA
-
200mA
-
250mA
-
350mA
-
400mA
-
500mA
-
700mA
-
750mA
-
1A
-
1.25A
-
1.5A
-
2A
-
2.5A
-
3A
-
3.5A
-
100mA
-
125mA
-
4A
-
5A
-
6A
10000
1000
TIME IN SECONDS
100
10
1
-
7A
0.1
0.01
0.01
0.1
1
10
100
1000
CURRENT IN AMPERES
NOTE - see important information under “User Guide”on P.08
Corporate Office
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel: 201-432-0463
Fax: 201-432-9542
E-Mail: belfuse@belfuse.com
Website: www.belfuse.com
Far East Office
Bel Fuse Ltd.
8F/8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel: 852-2328-5515
Fax: 852-2352-3706
European Office
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Preston PR1 8UD
Lancashire, U.K
Tel: 44-1772-556601
Fax: 44-1772-888366
Specifications subject to change without notice
34
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