Page 1
POWR-GARD® Fuse Datasheet
ø 3.56
SPXI SERIES IN-LINE SOLAR FUSE
1500 VDC • 2.5-3.5 A
Patent Pending
Description
The Littelfuse SPXI solar fuse is designed to integrate
into an in-line assembly within a wire harness. The fuse
provides photovoltaic (PV) protection that meets UL 2579 for
photovoltaic applications. The SPXI can be electrically insulated
by either overmolding or using approved heat-shrink.
Features/Benefits
• Meets UL 2579 photovoltaic specifications
• 15,000 A interrupting rating
• No fuse holder required
Applications
• Photovoltaic wire harness
Recommended Crimping Tool
T&B Sta-Kon ERG4002 or equivalent
Weidmüller HTN 21 or equivalent
Specifications
Voltage Rating: 150 0 VDC
Amperage Rating: 2.5-3.5 A
(contact factory for more amperages)
Max. Interrupting Rating: 15 k A
Time Constant ≤ 1ms
Material: Body: Melamine
Caps: Copper Alloy (Nickel Plated)
Approvals: UL 2579 Recognized (File: E339112)
Environmental: RoHS Compliant
Country of Origin: Mexico
Part Numbering System
SPXI xxx T
Series
Amp Code
Refer to Amp Code
Column in Ordering
Information Table
SERIES AMP
SPXI 2.5 10 SPXI02.5 SPXI02.5T
SPXI 3.5 50 SPXI03.5 SPXI03.5L
PACK AGE
QUANTITY
Package Quantity
T = 10
L = 50
CATALOG
NUMBER
ORDERING
NUMBER
Web Resources
Download technical documents: littelfuse.com/spxi
Dimensions mm (in)
9.53
(0.375)
1 of 3
81.41
(3.205)
10.31
(0.406)
littelfuse.com © 2014 Littelfuse POWR-GARD® Products
5.59
(0.220)
(0.140)
Rev: 020414
Page 2
POWR-GARD® Fuse Datasheet
SPXI SERIES IN-LINE SOLAR FUSE
Ordering Information
SERIES AMPERAGE AMP CODE CATALOG NUMBER PRODUCT MARKING PACK QUANTITY ORDERING NUMBER UPC
SPXI 2.5 02.5 SPXI02.5 SPXI 2 ½
SPXI 3.5 03.5 SPXI03.5 SPXI 3 ½
Electrical Specifications
10 SPXI02.5T 07945880950
50 SPXI02.5L 07945880949
10 SPXI03.5T 07945880808
50 SPXI03.5L 07945880149
VOLTAGE
AMPERAGE
2.5 1500 – 15 kA
3.5 1500 – 15 kA
INTERRUPTING
RATING
DC AC DC UL RECOGNIZED
WIRE RANGE
10 AWG (6 mm2)
10 AWG (6 mm2)
NOM COLD
RESISTANCE
(ohm)
0.099 0.859 0.482 0.350 6.78 15 .78 •
0.0711 1.56 0.81 0.57 25 50 •
WATTS LOSS
AT 100% RATED
CURRENT (W)
WATTS LOSS
AT 80% RATED
CURRENT (W)
WATTS LOSS
AT 70% RATED
CURRENT (W)
MELTING
I2t (A2 s) 15 kA
(1500VDC)
TOTAL
CLEARING
I2t (A2 s) 15 kA
(1500VDC)
Electrical Specification – Agency Requirements
AMPERAGE RATING
2.5-3.5 60 Max 4 Max
135% of Amp Rating per UL 200% of Amp Rating per UL
OPENING TIME (MINUTES)
Temperature Rerating Curve
(Temperature of Air Immediately Surrounding Fuse)
60
40
20
PERCENT OF UPRATING
0
PERCENT OF DOWNRATING
0
20
AGENCY
APPROVALS
40
60
-60˚ C -40˚ C -20˚ C 0˚ C 20˚ C 40˚ C 60˚ C 80˚ C 100˚ C 120˚ C 140˚ C
-76˚ F -40˚ F -4˚ F -32˚ F 68˚ F 104˚ F 140˚ F 176˚ F 212˚ F 248˚ F 284˚ F
AMBIENT TEMPERATURE
littelfuse.com © 2014 Littelfuse POWR-GARD® Products
2 of 3
Rev: 020414
Page 3
POWR-GARD® Fuse Datasheet
- 2-1/2A
SPXI SERIES IN-LINE SOLAR FUSE
Time Current Curve (2.5 A) Time Current Curve (3.5 A)
1000
900
800
700
600
500
400
300
200
0.1
1000
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TIME IN SECONDS
1
0.9
0.8
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0.1
0.09
0.08
0.07
0.06
0.05
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0.02
0.01
0.1
0.5
0.4
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0.2
2
1
0.9
0.8
0.7
0.6
2
1
20
10
9876543
20
10
9876543
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
100
90807060504030
300
200
100
90807060504030
1000
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400
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100
90
80
70
60
50
40
30
20
10
9
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4
3
2
1
0.9
0.8
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0.09
0.08
0.07
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0.05
0.04
0.03
0.02
0.01
1000
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400
0.2
0.1
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TIME IN SECONDS
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.09
0.08
0.07
0.06
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0.01
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0.1
0.9
0.8
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0.3
0.5
0.4
0.3
2
1
0.9
0.8
0.7
0.6
2
1
20
10
9876543
20
10
9876543
- 3-1/2A
90807060504030
300
200
100
90807060504030
1000
900
800
700
600
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400
300
200
100
90
80
70
60
50
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10
9
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3
2
1
0.9
0.8
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0.3
0.2
0.1
0.09
0.08
0.07
0.06
0.05
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0.03
0.02
0.01
1000
900
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1000
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500
400
300
200
100
CURRENT IN AMPERES
CURRENT IN AMPERES
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3 of 3
Rev: 020414
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