SPXI02.5TXB Equivalent & Substitute Parts

Part Overview

The SPXI02.5TXB is a 2.5A 1.5 kVDC fuse cartridge manufactured by Littelfuse Inc. as part of the POWR-GARD® SPXI series. This free-hanging inline cartridge fuse is designed for solar photovoltaic applications and features fast-blow response characteristics. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new installations.

Substiute Parts

SPXI02.5TXB

Littelfuse Inc.In Stock: 1094SPXI02.5TXB Datasheet

Current PartRFQ

SPXI02.5T

Littelfuse Inc.In Stock: 987SPXI02.5T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SPXI02.5TXB is based on strict electrical and mechanical parameter matching within the POWR-GARD® SPXI series. The following parameters determine substitution eligibility:

Critical Matching Parameters:

• Current Rating: 2.5A
• Voltage Rating (DC): 1.5 kVDC
• Fuse Type: Cartridge
• Mounting Type: Free Hanging (In-Line)
• Package / Case: Cartridge, Inline, Double Ended
• Breaking Capacity @ Rated Voltage: 30 kA
• DC Cold Resistance: 0.099 Ohms
• Melting I²t: 7
• Applications: Solar (Photovoltaic)

The SPXI02.5T qualifies as a direct substitute because it maintains all critical electrical parameters and mechanical form factor. The primary distinction is product status (active versus obsolete) and dimensional variation in length, which does not affect electrical performance or circuit compatibility in standard inline fuse holder applications.

Parameter Comparison

Engineering Selection Recommendations

The SPXI02.5T is the direct active equivalent for the obsolete SPXI02.5TXB. Selection of the SPXI02.5T is supported by the following engineering criteria:

Electrical Compatibility: Both parts maintain identical current rating (2.5A), voltage rating (1.5 kVDC), breaking capacity (30 kA), DC cold resistance (0.099 Ohms), and melting I²t (7). These parameters ensure equivalent circuit protection performance in solar photovoltaic applications.

Mechanical Compatibility: Both parts share identical diameter (0.406" / 10.31mm) and cartridge form factor. The length difference (3.362" versus 2.240") does not affect electrical function and accommodates standard inline fuse holder designs used in photovoltaic systems.

Compliance Status: The SPXI02.5T carries active product status with ROHS3 compliance, providing access to current manufacturing and supply chain support. Both parts maintain EAR99 export classification and identical HTSUS coding.

Certification Alignment: The SPXI02.5T retains CE and UR certifications. The main part includes additional gPV and UL certifications; however, the UR certification on the substitute part is sufficient for solar photovoltaic circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the SPXI02.5T directly replace the SPXI02.5TXB in existing solar installations?

A: Yes. The SPXI02.5T maintains all critical electrical parameters (2.5A current rating, 1.5 kVDC voltage rating, 30 kA breaking capacity) and mechanical form factor (cartridge, inline, double-ended) required for direct substitution in standard photovoltaic fuse holder applications.

Q: What is the significance of the length difference between these parts?

A: The SPXI02.5TXB measures 3.362" in length while the SPXI02.5T measures 2.240" in length. Both diameters are identical (0.406"). This length variation does not affect electrical performance or compatibility with standard inline fuse holders used in photovoltaic systems.

Q: Are there differences in certifications between the two parts?

A: The SPXI02.5TXB carries CE, gPV, UL, and UR certifications. The SPXI02.5T carries CE and UR certifications. Both parts meet the certification requirements for solar photovoltaic circuit protection applications.

Q: What is the difference between RoHS and ROHS3 compliance?

A: Both parts are RoHS compliant. The SPXI02.5TXB is marked as RoHS Compliant, while the SPXI02.5T is marked as ROHS3 Compliant. Both designations indicate compliance with Restriction of Hazardous Substances regulations and do not affect electrical or mechanical compatibility.

Q: Why is the SPXI02.5TXB classified as obsolete?

A: Product obsolescence is determined by manufacturer lifecycle decisions. The SPXI02.5T is the active equivalent within the POWR-GARD® SPXI series and provides continued access to 2.5A 1.5 kVDC fuse cartridge technology for solar applications.

Q: Are the DC cold resistance and melting I²t values identical?

A: Yes. Both parts maintain 0.099 Ohms DC cold resistance and melting I²t of 7, ensuring identical thermal and electrical response characteristics in circuit protection applications.

Q: What packaging differences exist between these parts?

A: The SPXI02.5TXB packaging is listed as hyphenated (not specified), while the SPXI02.5T is supplied in box packaging. This difference affects logistics and storage but does not impact electrical or mechanical performance.