Revised: January 7, 2009
329
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Axial Lead & Cartridge Fuses
325/326 Series
3AB > Time Lag > 325/326 Series
Please refer to www.littelfuse.com/series/325.html
or /326.html for current information.
325/326 Series
325/326 Series Lead-Free 3AB, Slo-Blo® Fuse
The 3AB Slo-Blo® Fuse with ceramic body construction
permits higher interrupting ratings and voltage ratings.
Ideal for applications where high current loads are
expected.
Agency Approvals
Agency Agency File Number Ampere Range
E10480 250mA - 10A
E10480 12A - 30A
LR 29862 250mA - 30A
PS
E
NBK 030805-
E10480A-F/
NBK 260106-
JP1021A/B
1A - 30A
SU05010-
5012/6006/6007/7005
2.5A - 3.2A/
7A - 30A
10mA - 30A
Features
Applications
Electrical Characteristics for Series
% of Ampere
Rating Ampere Rating Opening Time
100% 100mA – 30A 4 hours, Minimum
135% 100mA – 30A 1 hour, Maximum
200%
100mA – 3.2A 5 sec., Min., 30 sec., Max.
4A – 30A 5 sec., Min., 60 sec., Max.
t *OBDDPSEBODFXJUI6-
Standard 248-14
t "WBJMBCMFJODBSUSJEHF
and axial lead format
and with various
forming dimensions
t 3P)4DPNQMJBOUBOE
Lead-free
Used as supplementary protection in appliance or
utilization equipment to provide individual protection for
components or internal circuits.
PS
E
Description
Revised: January 7, 2009
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
330 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Axial Lead & Cartridge Fuses
325/326 Series
3AB > Time Lag > 325/326 Series
Please refer to www.littelfuse.com/series/325.html
or /326.html for current information.
Electrical Characteristic Specifications by Item
*Higher I2t version available. 0325020.MXDP nominal I2t is 2507 A2 Sec
Amp Code
Ampere
Rating
(A)
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2 sec)
Agency Approvals
PS
E
.010 0.01 250
100A@250Vac
3324.8000 0.00148 x
.031 0.031 250 332.5000 0.0110 x
.062 0.062 250 91.7000 0.0276 x
.100 0.1 250 33.5500 0.0870 x
.125 0.125 250 22.4500 0.100 x
.150 0.15 250 15.4500 0.143 x
.175 0.175 250 8.9200 0.220 x
.187 0.187 250 7.7250 0.230 x
.200 0.2 250 6.7700 0.213 x
.250 0.25 250
100A@250Vac
10KA@125Vac
10KA@125Vdc
4.4300 0.432 x x x
.300 0.3 250 3.2200 0.690 x x x
.375 0.375 250 2.1550 1.20 x x x
.400 0.4 250 1.9350 1.33 x x x
.500 0.5 250 1.3000 2.50 x x x
.600 0.6 250 0.9495 3.90 x x x
.700 0.7 250 0.7215 6.42 x x x
.750 0.75 250 0.6410 7.00 xxx
.800 0.8 250 0.5725 8.20 x x x
001. 1 250 0.3890 16.3 x x x x
01.2 1.2 250 0.2860 22.0 x x x x
1.25 1.25 250 0.2680 24.0 x x x x
01.5 1.5 250 0.1975 40.1 x x x x
01.6 1.6 250 0.1760 45.0 x x x x
002. 2 250 0.1210 80.0 x x x x
02.5 2.5 250 0.0835 136.0 x xxxx
02.8 2.8 250 0.0695 170.0 x xxxx
003. 3 250 0.0605 200.0 x xxxx
03.2 3.2 250
100A@250Vac
100KA@125Vac
0.0539 214.0 x xxxx
004. 4 250
400A@250Vac
10KA@125Vac
0.0761 9.71 x x x x
005. 5 250 0.0522 25.0 x x x x
6.25 6.25 250 0.0346 60.4 x x x x
007. 7 250 0.0227 47.3 x xxxx
008. 8 250 0.0193 67.1 x xxxx
010. 10 250 0.0132 137 x xxxx
012. 12 250
400A@250Vac
10KA@125Vac
500A@60Vdc
0.0067 129 xxx xx
012.* 12 250 0.0011 445 x x x
015. 15 250 0.0050 245 xxx xx
015.* 15 250 0.0083 760 x x x
020. 20 250 0.0034 575 xxx xx
020.* 20 250 0.0042 1900 xx x
025. 25 125
400A@125Vac
10KA@60Vdc
600A@125Vdc
0.0024 1030 x x x x x
030. 30 125 0.0019 1690 x x x x x
Revised: January 7, 2009
331
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Axial Lead & Cartridge Fuses
325/326 Series
3AB > Time Lag > 325/326 Series
Please refer to www.littelfuse.com/series/325.html
or /326.html for current information.
325/326 Series
Average Time Current Curves
1000
100
10
1
0.1
0.01
10
CURRENT IN AMPERES
TIME IN SECONDS
100 10000.1 10.05
5.0A
4.0A
3.5A
3.0A
2.5A
2.0A
1.5A
1.0A
.750A
.500A
.375A
20.0A
15.0A
12.0A
10.0A
8.0A
7.0A
6.25A
30.0A
25.0A
Temperature Rerating Curve
Soldering Parameters - Wave Soldering
Dwell Time
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
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
Time (Seconds)
Temperature (°C) - Measured on bottom side of board
Cooling Time
Preheat Time
Wave Parameter Lead-Free Recommendation
Preheat:
(Depends on Flux Activation Temperature) (Typical Industry Recommendation)
Temperature Minimum: 100° C
Temperature Maximum: 150° C
Preheat Time: 60-180 seconds
Solder Pot Temperature: 260° C Maximum
Solder Dwell Time: 2-5 seconds
Recommended Hand-Solder Parameters:
Solder Iron Temperature: 350° C +/- 5°C
Heating Time: 5 seconds max.
Note: These devices are not recommended for IR or
Convection Reflow process.
Recommended Process Parameters:
Revised: January 7, 2009
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
332 © 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Axial Lead & Cartridge Fuses
325/326 Series
3AB > Time Lag > 325/326 Series
Please refer to www.littelfuse.com/series/325.html
or /326.html for current information.
Materials
Body: Ceramic
Cap: Nickel–plated brass
Leads: Tin–plated Copper
Terminal Strength MIL-STD-202G, Method 211A,
Test Condition A
Solderability Reference IEC 60127 Second Edition
2003-01 Annex A
Product Marking
Cap1: Brand logo, current and voltage
ratings
Cap2: Series and agency approval
marks
Operating Temperature –55ºC to +125ºC
Thermal Shock
MIL-STD-202G, Method 107G, Test
Condition B:(5 cycles - 65ºC to
125ºC)
Vibration: MIL-STD-202G, Method 201A
Humidity
MIL-STD-202G, Method 103B, Test
Condition A: High RH (95%) and
Elevated temperature(40ºC) for 240
hours
Salt Spray MIL-STD-202G, Method 101D, Test
Condition B
Product Characteristics
Dimensions
Packaging
326 000P Series 325 000P Series
6.35 (.25")
32.72
(1.288")
31.75
(1.25")
6.985 (.275")
38.1
(1.50") TYP.
Axial Lead Material: Tin coated copper.
1100
/
0.813 (.032") ( -15A
)
1.016 (.040") (20 -30A)
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code Reel Size
325 Series
Bulk N/A 5 VX N/A
Bulk N/A 100 HX N/A
Bulk N/A 1000 MX N/A
Bulk N/A 1000 MX52 N/A
Bulk N/A 1000 MX52L N/A
Bulk N/A 1000 MXD N/A
Bulk N/A 1000 MXF31 N/A
326 Series
Bulk N/A 5 VX N/A
Bulk N/A 100 HX N/A
Bulk N/A 1000 MX N/A
Bulk N/A 1000 MXCC N/A
Bulk N/A 1000 MXD N/A
Part Numbering System
0325 M X Pxxxx
Lead-free
Packaging Code
Quantity Code
Amp Code
Series
X = Filler
M = 1000
Refer to Amp Code column of
Electrical Characteristics Table
