FM12A, MIL-PRF-23419/12 QPL Series
Part Numbering System
FM12A
Fuse Type
72V
Voltage
1A
Amp
Part Number/Rating
Max.
voltage
(VDC)
50
72
72
72
72
72
72
72
72
72
72
72
72
72
72
72
125
125
125
125
125
125
125
125
125
125
125
Current
Rating
(Amp)
20.0
1/8
1/4
3/8
1/2
3/4
1.0
1.5
2.0
3.0
4.0
5.0
6.0
7.5
10.0
15.0
1/8
1/4
3/8
1/2
3/4
1.0
1.5
2.0
3.0
4.0
5.0
Cold Resistance
(Ohm)
Note 1
Min.
Max.
Fig.*
(1, 2,
Or 3)
3
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
2
2
2
2
2
2
2
2
Overload Interrupt Time
(Second)
Nominal Rating - Note 2
Nominal Rating - Note 3
(Ampere Second)
Maximum I
2
T
2
Part Number
FM12A50V20A
FM12A72V1/8A
FM12A72V1/4A
FM12A72V3/8A
FM12A72V1/2A
FM12A72V3/4A
FM12A72V1A
FM12A72V-1.5A
FM12A72V2.0A
FM12A72V3.0A
FM12A72V4.0A
FM12A72V5.0A
FM12A72V6.0A
FM12A72V7.5A
FM12A72V10A
FM12A72V15A
FM12A125V1/8A
FM12A125V1/4A
FM12A125V3/8A
FM12A125V1/2A
FM12A125V3/4A
FM12A125V1A
FM12A125V1.5A
FM12A125V2.0A
FM12A125V3.0A
FM12A125V4.0A
FM12A125V5.0A
NOTES:
250%
.01 - .300
0 - 30.0
0 - 30.0
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
0 - 30.0
0 - 30.0
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
.01 - .300
400%
.001 - .015
0 - .015
0 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
.001 - .015
0 - .015
0 - .015
.0005 - .015
.0005 - .015
.0005 - .015
.0005 - .015
.0005 - .015
.0005 - .015
.0005 - .015
.0005 - .015
.0005 - .015
600%
.00015 - .003
0 - .003
0 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
.00015 - .003
0 - .003
0 - .003
.00005 - .003
.00005 - .003
.00005 - .003
.00005 - .003
.00005 - .003
.00005 - .003
.00005 - .003
.00005 - .003
.00005 - .003
250%
750.000
2.930
11.719
0.264
0.469
1.055
1.875
4.219
7.500
16.875
30.000
46.875
67.500
105.469
187.500
421.875
2.930
11.719
0.264
0.469
1.055
1.875
4.219
7.500
16.875
30.000
46.875
400%
96.000
0.004
0.015
0.034
0.060
0.135
0.240
0.540
0.960
2.160
3.840
6.000
8.640
13.500
24.000
54.000
0.004
0.015
0.034
0.060
0.135
0.240
0.540
0.960
2.160
3.840
6.000
600%
43.200
0.002
0.007
0.015
0.027
0.061
0.108
0.243
0.432
0.972
1.728
2.700
3.888
6.075
10.800
24.300
0.002
0.007
0.015
0.027
0.061
0.108
0.243
0.432
0.972
1.728
2.700
0.0025
6.375
1.875
1.125
0.675
0.225
0.135
0.097
0.045
0.0262
0.0195
0.0135
0.0112
0.0082
0.0063
0.0038
6.375
1.875
1.125
0.675
0.225
0.090
0.085
0.045
0.035
0.030
0.022
0.0050
10.625
3.125
1.875
1.125
0.375
0.225
0.163
0.075
0.0438
0.0325
0.0225
0.0188
0.0138
0.0107
0.0070
10.625
3.125
1.875
1.125
0.375
0.270
0.225
0.135
0.105
0.090
0.068
1. Cold resistance is measured at from 0.1 to 10 milliamperes of current.
2. Overload interrupt times at -55ºC and 250% overload current shall be as follows:
a) Fuses with ratings <3/8 amps shall open in 60 secs max. b) Fuses with ratings from 3/8 to 1.0 amp shall open in 10 secs max. c) Fuses with ratings > 1.0 amp shall open in 5 secs max.
3. Maximum I
2
T at -55ºC and 250% overload current may be greater than indicated. To calculate I
2
T at a case temperature of -55ºC and 250% overload current, multiply the I
2
product by the
maximum blow times indicated in note 2 above.
*Please see MIL-PRF-23419/12A for figures detailing dimensions, construction and marking
INCH-POUND
MIL-PRF-23419/12A
18 May 2001
SUPERSEDING
MIL-PRF-23419/12
11 January 1993
PERFORMANCE SPECIFICATION SHEET
FUSES, CARTRIDGE, INSTRUMENT TYPE, STYLE FM12
(SUBMINIATURE - HIGH PERFORMANCE)
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
The requirements for acquiring the product described herein
shall consist of this specification and MIL-PRF-23419.
Inches
.002
.010
.020
.025
.026
.050
.070
.145
.160
.270
.280
1.50
mm
0.05
0.25
0.51
0.64
0.66
1.27
1.78
3.68
4.06
6.86
7.11
38.1
NOTES:
1. Dimensions are in inches.
2. Metric equivalents are given for general information only.
3. Unless otherwise specified, tolerance is
±.01
(0.3 mm).
FIGURE 1. Style FM12 fuse (.026 inch diameter leads).
AMSC N/A
1 of 14
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
FSC 5920
MIL-PRF-23419/12A
REQUIREMENTS:
Interface and physical dimensions: See table I and figures 1, 2, or 3.
Case material: Polyphenlene sulfide (PPS) Ryton R-4 or equivalent.
Internal construction: The fuse element shall be a thick film material printed on a thermally insulated
substrate and sealed with a thick film arc suppressive glass.
Terminals:
Material: CDA-102 Copper.
Finish: Gold plate in accordance with MIL-G-45204, type II, grade C, class 1 with nickel underplate of
50 microinches.
Strength: Five pounds applying force axially to each fuse, and one pound applying three bends to
each terminal.
Outgassing: Material shall meet the outgassing requirements specified in MIL-PRF-23419.
Current rating: See table I.
Voltage rating: See table I.
Current carrying capacity: 100 percent at +25°C; 110 percent at -55°C; 80 percent at +125°C. Current
carrying capacity is independent of vacuum conditions. The temperature of the case or terminals shall,
at no point, rise more than +85°C above the ambient air temperature. The maximum temperature rise
for 6.0, 7.5, 10, 15, and 20 ampere fuses shall be +120°C.
Resistance: See table I.
Overload interrupt: Interrupt time from -55°C through +125°C shall be as specified in table I. The
following exception shall apply for interrupt times at -55°C and 250 percent overload current:
a. Fuse ratings of 1.0 ampere and less shall open in 10 seconds maximum.
b. Fuse rating greater than 1.0 ampere shall open in 5 seconds maximum.
c.
Fuse ratings less than 3/8 ampere shall open in 60 seconds maximum.
For group B, group C, and qualification inspections, the power supply shall have an open-circuit voltage
of not less than that of the specified voltage rating of the fuse under test. Opening times (the interval
measured from the application of current to the time the current drops below the rating of the fuse) shall
be made with an oscillogram for periods shorter than 1 second.
Short circuit interrupt: 1,000 amperes at maximum voltage dc.
Maximum current clearing I
2
t: The maximum current clearing I
2
t shall be in accordance with MIL-PRF-
23419 and shall be as specified in table I.
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