© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/16/16
Axial Lead & Cartridge Fuses
3AB > Slo-Blo® Fuse > 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 0.250A - 10A
E10480 12A - 30A
29862 0.250A - 30A
PS
E
Cartridge:
NBK 030805-E10480A
NBK 030805-E10480C
NBK 030805-E10480E
NBK 260106-JP1021A
Leaded:
NBK 030805-E10480B
NBK 030805-E10480D
NBK 030805-E10480F
NBK 260106-JP1021B
1A-3.2A
4A-5A
6.25A-15A
20A-30A
1A-3.2A
4A-5A
6.25A-15A
20A-30A
SU05001-5010
SU05001-5011
SU05001-5012
SU05001-6006
SU05001-6007
7-10A
12A, 15A
20A
2.8A-3.2A
2.5A
T 50239752 01 *12A/*15A/*20A
N/A 0.010A - 30A
Features
Applications
RoHS
Pb
Electrical Characteristics for Series
% of Ampere
Rating Ampere Rating Opening Time
100% 0.010A – 30A 4 hours, Minimum
135% 0.010A – 30A 1 hour, Maximum
200%
0.010A – 3.2A 5 sec., Min., 30 sec., Max.
4A – 30A 5 sec., Min., 60 sec., Max.
• In accordance with UL
Standard 248-14
• Available in cartridge
and axial lead format
and with various forming
dimensions
• RoHS compliant and
Lead-free
Used as supplementary protection in appliance or
utilization equipment to provide individual protection for
components or internal circuits.
PS
E
Description
Additional Information
Datasheet Samples
Resources
Datasheet Samples
Resources
325 Series
326 Series
325 Series
326 Series
325 Series
326 Series
* Approved for cartridge version only
Application testing is strongly recommended.
For recommended fuse accessories for this product series,
see ‘Recommended Accessories’ section.
Accessories
Accessories
325 Series
326 Series
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/16/16
Axial Lead & Cartridge Fuses
3AB > Slo-Blo® Fuse > 325/326 Series
Electrical Characteristic Specifications by Item
*Higher i2t version available. Please add suffix “D” to part numbers. For instance, 0325020.MXDP, 0326020.MXDP
I2t test at 10× rated current.
**Higher I2t version available. Please add suffix “W” to part numbers. For instance, 0325025.MXWP
***Approved for cartridge versions only, and interrupting rating is 400A@125Vac and 400A@250Vac
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 0.00013 x
.031 0.031 250 332.5000 0.0110 x
.062 0.062 250 91.7000 0.0276 x
.10 0 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 0.350 x
.187 0.187 250 7.7250 0.330 x
.200 0.2 250 6.7700 0.316 x
.250 0.25 250
100A@250Vac
10KA@125Vac
10KA@125Vdc
4.4300 0.804 x x x
.300 0.3 250 3.2200 1.230 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 4.80 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 13.00 x x x
.800 0.8 250 0.5725 8.20 x x x
0 01. 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 40.0 x x x x
01. 5 1. 5 250 0.1975 59.7 x x x x
01. 6 1. 6 250 0.1760 66.0 x x x x
002. 2 250 0.1210 118.0 x x x x
02.5 2.5 250 0.0835 185.0 x x x x x
02.8 2.8 250 0.0695 232.0 x x x x x
003. 3 250 0.0605 200.0 x x x x x
03.2 3.2 250
100A@250Vac
10KA@125Vac
0.0539 214.0 x x x x x
004. 4 250
400A@250Vac
10KA@125Vac
10KA@125Vdc
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
0 0 7. 7 250 0.0227 47.3 x x x x x
008. 8 250 0.0193 67.1 x x x x x
010. 10 250 0.0132 137 x x x x x
012. 12 250
400A@250Vac
10KA@125Vac
600A@125Vdc
0.0067 129 x x x x x*** x
012.* 12 250
1500A@250Vac
0.0011 618 x x x
015. 15 250
400A@250Vac
10KA@125Vac
600A@125Vdc
0.0050 245 x x x x x*** x
015.* 15 250
1500A@250Vac
0.0083 760 x x x
020. 20 250
400A@250Vac
10KA@125Vac
600A@125Vdc
0.0034 575 x x x x x*** x
020.* 20 250
1500A@250Vac
0.0042 2500 x x x
025.** 25 250
1500A@250Vac
0.0032 4682 x x
025. 25 250
400A@250Vac
10KA@60Vdc
600A@125Vdc
0.0024 1030 x x x x
030. 30 250 0.0019 1690 x x x x
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/16/16
Axial Lead & Cartridge Fuses
3AB > Slo-Blo® Fuse > 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 Re-rating 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:
Note:
Rerating depicted in this curve is in addition to the standard derating of 25%
for continuous operation.
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/16/16
Axial Lead & Cartridge Fuses
3AB > Slo-Blo® Fuse > 325/326 Series
Materials
Body: Ceramic
Cap: Nickel–plated brass
Leads: Tin–plated Copper
Terminal Strength MIL-STD-202, Method 211,
Test Condition A
Solderability MIL-STD-202 Method 208
Product Marking
Cap1: Brand logo, current and voltage
ratings
Cap2: Series and agency approval
marks
Operating Temperature –55ºC to +125ºC
Thermal Shock
MIL-STD-202, Method 107, Test
Condition B:(5 cycles - 65ºC to
125ºC)
Vibration: MIL-STD-202, Method 201
Humidity
MIL-STD-202, Method 103, Test
Condition A: High RH (95%) and
Elevated temperature(40ºC) for 240
hours
Salt Spray MIL-STD-202, Method 101, Test
Condition B
Product Characteristics
Packaging
326 000P Series
(cartridge)
325 000P Series
(axial leaded)
6.35±0.3
(.25")
32.72±1.12
(1.288")
31.75±1.12
(1.25")
6.985±0.3
(.275")
Axial Lead Diameter:
0.81±0.05 (.032") for
(0.01A - 15A)
1.02±0.06 (.040") for
(20A - 30A)
Axial Lead Length:
38.1±3.15 (1.50") TYP.
52±1(2.0”) for long lead
Axial Lead Material:
Tin-coated copper
Part Numbering System
0325 MX Pxxxx
Lead-free
Packaging Code
Quantity Code
Amp Code
Series
X = Filler
M = 1000
Refer to Amp Code column of
Electrical Characteristics Table
Dimensions
Measurements displayed in millimeters (inches)
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code
Taping Width
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 (long lead) N/A
Bulk N/A 1000 MX52L (long lead) N/A
Bulk N/A 1000 MXD N/A
Bulk N/A 1000 MXF31 N/A
Bulk N/A 1000 MXW 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
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/16/16
Axial Lead & Cartridge Fuses
3AB > Slo-Blo® Fuse > 325/326 Series
Recommended Accessories
Accessory
Type Series Description
Max
Application
Voltage
Max
Application
Amperage
Holder
155100 Twist-Lock In-Line Fuseholder 32 20
342 Traditional Panel Mount Fuseholder 250 20
346 Panel Mount Flip-Top Shock-Safe Fuseholder 250 15
345 Shock-Safe Fuseholder with PC Mount, Solder Mount and Panel Mount options 250 20
Block 354 Low Profile OMNI-BLOK® Fuse Block 600 30
359 High Current Screw Terminal Fuse Block 30
Clip 122 High Current Traditional PC Board Fuse Clip 1000 30
101 Rivet/Eyelet Type Fuse Clip 1000 15
Notes:
1. Do not use in applications above rating.
2. Please refer to fuseholder data sheet for specific re-rating information.
3. Please contact Littelfuse for applications greater than the max voltage and amperage shown.
