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Axial Lead and Cartridge Fuses
Subminiature
®
®
QPL
®
PICO II Very Fast-Acting Fuse 251/253
The PICO® II very fast-acting fuse is designed to meet an extensive array
of performance characteristics in a space-saving subminiature package.
ELECTRICAL CHARACTERISTICS:
% of Ampere
Rating
Ampere
Rating
Opening
Time
100%
1/16–15
1/16–7
10
4 hours, Minimum
1 second, Maximum
3 seconds, Maximum
10 seconds, Maximum
200%
12–15
AGENCY APPROVALS: Recognized under the Components
Program of Underwriters Laboratories and Certified by CSA.
Approved by METI from 1 through 5 amperes.
AGENCY FILE NUMBERS: UL E10480, CSA LR 29862.
REFERENCE TO MIL SPEC: Available in FM10 on QPL for
MIL-PRF-23419. To order, change 251 to 253 as shown below.
INTERRUPTING RATINGS:
38.1
38.1
(1.5")
7.11 (.280")
REF.
(1.5")
2.41 (.095")
DIA. REF.
F
1 A
L
300 amperes at rated voltage VDC.
0.64 (.025")
DIA.
50 amperes at rated voltage VAC.
EPOXY COATING
ENVIRONMENTAL SPECIFICATIONS:
Operating Temperature: –55°C to 125°C.
Shock: MIL-STD-202, Method 213, Test Condition I
(100 G’s peak for 6 milliseconds).
1
16
NOTE: .025" diameter for / –10A, .032" diameter for 12 –15A.
Vibration: MIL-STD-202, Method 201 (10–55 Hz);
Method 204, Test Condition C (55–2000 Hz at 10 G’s Peak).
Moisture Resistance: MIL-STD-202, Method 106.
PHYSICAL SPECIFICATIONS:
Average Time Current Curves
Materials: Encapsulated, Epoxy-Coated Body; Solder Coated Copper
Wire Leads.
100
Flammability Rating: UL 94V0
Soldering Parameters:
Wave Solder — 260°C, 10 seconds maximum.
Solderability: MIL-STD-202, Method 208.
Lead Pull Force: MIL-STD-202, Method 211, Test Condition A (will
withstand a 7 lb. axial pull test).
PACKAGING SPECIFICATIONS: Tape and Reel per EIA-296; T1:
2.062" (52.4mm) taped spacing; 5,000 per reel.
Option: Radial Lead Version; 0.4" lead spacing; to order, change
251 to 252.
10
1
PATENTED
ORDERING INFORMATION:
Std. Type
Catalog
Number
Mil. Type
Catalog
Number
Nominal
Resistance
Cold Ohms
Nominal
2
Ampere Voltage
Melting I t
0.1
2
Rating
Rating
A Sec.
R251.062
R251.125
R251.250
R251.375
R251.500
R251.750
R251 001
R251 01.5
R251 002
R251 02.5
R251 003
R251 03.5
R251 004
R251 005
R251 007
R251 010
R251 012
R251 015
R253.062
R253.125
R253.250
R253.375
R253.500
R253.750
R253 001
R253 01.5
R253 002
1/16
1/8
1/4
3/8
1/2
3/4
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
32
7.0
0.000113
0.00174
0.0116
0.0296
0.0598
0.153
0.256
0.587
0.405
0.721
1.19
1.70
0.665
0.395
0.01
0.001
0.280
0.175
1
0.128
1
2
1 /
0.0823
0.0473
0.0360
0.0290
0.0240
0.0204
0.0155
0.0105
0.00705
0.0055
0.00446
2
1
2
2 /
R253 003
3
1
2
3 /
1.58
0.05 0.1
1
10
100
1000
R253 004
R253 005
R253 007
R253 010
4
5
2.45
CURRENT IN AMPERES
4.14
7
10.4
10
12
15
25.5
45.2
R253 015
32
68.8
Note: Higher Ampere Ratings Available.
Contact Technical Assistance for Details
280
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