Axial Lead & Cartridge Fuses
3AG > Time Lag > 373/375 Series
373/375 Series Lead-Free 3AG, Slo-Blo
®
Fuse
Description
RoHS
Pb
The 3AG Slo-Blo
®
fuse solves a broad range of application
requirements while offering reliable performance and cost-
effective circuit protection.
Features
• In accordance with UL
Standard 248-14
• Available in cartridge
and axial lead format
and with various forming
dimensions
Ampere Range
• RoHS compliant and
Lead-free
Agency Approvals
Agency
Agency File Number
E10480
12A, 15A
LR 29862
Applications
Used as supplementary protection in appliance or
utilization equipment to provide individual protection for
components or internal circuits.
Electrical Characteristics by Series
Additional Information
% of Ampere
Rating
100%
Ampere Rating
12A, 15A
12A, 15A
12A, 15A
Opening Time
4 hours, Minimum
1 hour, Maximum
5 sec., Min.,
60 sec Max
Datasheet
373 Series
Resources
373 Series
Samples
373 Series
135%
200%
Datasheet
375 Series
Resources
375 Series
Samples
375 Series
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/16/18
Axial Lead & Cartridge Fuses
3AG > Time Lag > 373/375 Series
Electrical Characteristic Specifications by Item
Ampere Rating
(A)
12
15
Voltage Rating
(V)
125
125
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
0.0065
0.0050
Nominal
Melting
I
2
t (A
2
sec)
1200
1870
Agency Approvals
Amp Code
012.
015.
10kA@125Vac
x
x
x
x
x
x
Temperature Rerating Curve
Average Time Current Curves
12A
15A
0.1
1
CURRENT IN
10
AMPERES
1000
100
TIME IN SECONDS
10
1
0.1
0.01
0.001
0.01
100
1000
Soldering Parameters - Wave Soldering
300
Recommended Process Parameters:
Wave Parameter
Preheat:
(Depends on Flux Activation Temperature)
(Typical Industry Recommendation)
Temperature (°C) - Measured on bottom side of board
280
260
240
220
200
180
160
140
120
100
80
60
40
20
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
10
20
30
40
50
60
70
80
90
0
0
Lead-Free Recommendation
Temperature Minimum:
Temperature Maximum:
Preheat Time:
Solder Pot Temperature:
Solder Dwell Time:
100
°
C
150
°
C
60-180 seconds
260
°
C Maximum
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.
Time (Seconds)
Preheat Time
Dwell Time
Cooling Time
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/16/18
Axial Lead & Cartridge Fuses
3AG > Time Lag > 373/375 Series
Product Characteristics
Materials
Terminal Strength
Solderability
Product Marking
Body: Glass
Cap: Nickel–plated brass
Leads: Tin–plated Copper
MIL-STD-202G, Method 211A, Test
Condition A
Reference IEC 60127 Second Edition
2003-01 Annex A
Cap1: Brand logo, current and voltage
ratings
Cap2: Series and agency approval marks
Operating
Temperature
Thermal Shock
Vibration
Humidity
–55ºC to +125ºC
MIL
-STD-202G, Method 107G, Test
Condition B: (5 cycles -65°C to +125°C)
MIL
-STD-202G, Method 201 A
MIL
-STD-202G, Method 103B, Test
Condition A: High RH (95%) and Elevated
temperature (40°C) for 240 hours
MIL STD-202G, Method 101D, Test
-
Condition B
Salt Spray
Dimensions
Part Numbering System
373 xxxx M X P
Series
Amp Code
Refer to Amp Code column of
Electrical Characteristics Table
Quantity Code
M = 1000
Packaging Code
X = Filler
Lead-free
Packaging
Packaging Option
373 Series
Bulk
Bulk
375 Series
Bulk
Bulk
Bulk
N/A
N/A
N/A
1000
100
1000
MX
HX
MXB
N/A
N/A
N/A
N/A
N/A
1000
100
MX
HX
N/A
N/A
Packaging Specification
Quantity
Quantity &
Packaging Code
Taping Width
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/16/18
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