SPXI025.T Equivalent & Substitute Parts

Part Overview

The SPXI025.T is a 25A 1.5 kVDC cartridge fuse manufactured by Littelfuse Inc., designed for solar photovoltaic applications with intrinsic safety features. This part is classified as obsolete, making identification of active equivalent models essential for procurement and system continuity. The SPXI025.T operates as a free-hanging inline fuse cartridge with a breaking capacity of 15 kA at rated voltage.

Substiute Parts

SPXI025.T

Littelfuse Inc.In Stock: 1123SPXI025.T Datasheet

Current PartRFQ

SPXI025.TXM

Littelfuse Inc.In Stock: 995SPXI025.TXM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPXI025.T is determined by strict equivalence across the following critical parameters:

• Current Rating: 25A (exact match required)
• Voltage Rating: 1.5 kVDC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Free Hanging (In-Line) (exact match required)
• Package / Case: Cartridge, Inline, Double Ended (exact match required)
• DC Cold Resistance: 0.0066 Ohms (exact match required)

The SPXI025.TXM meets all substitution criteria as an active product within the same POWR-GARD® SPXI series, maintaining identical electrical and mechanical specifications while offering enhanced breaking capacity and current regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The SPXI025.TXM is the direct active equivalent for the obsolete SPXI025.T. Both parts maintain identical electrical and mechanical specifications across all critical substitution parameters. The SPXI025.TXM offers the following advantages:

• Active product status ensures ongoing availability and supply chain continuity
• Enhanced breaking capacity of 30 kA compared to 15 kA provides improved fault protection margins
• Current regulatory certifications (CE, gPV, UL, UR) align with modern solar photovoltaic system standards
• Fast Blow response time specification provides defined protection characteristics
• RoHS compliance status meets current environmental requirements

Selection of the SPXI025.TXM eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing system designs.

Frequently Asked Questions (FAQ)

Q: Can the SPXI025.TXM be used as a direct replacement for the SPXI025.T?

A: Yes. Both parts share identical current rating (25A), voltage rating (1.5 kVDC), fuse type (Cartridge), mounting type (Free Hanging In-Line), package configuration (Cartridge Inline Double Ended), and DC cold resistance (0.0066 Ohms). The SPXI025.TXM is electrically and mechanically compatible.

Q: What is the difference in breaking capacity between these parts?

A: The SPXI025.T has a breaking capacity of 15 kA at rated voltage, while the SPXI025.TXM has 30 kA. The higher breaking capacity of the substitute part provides enhanced fault protection without affecting normal operation.

Q: Are there physical dimension differences between the SPXI025.T and SPXI025.TXM?

A: Yes. The SPXI025.T measures 0.540" Dia x 3.370" L (13.72mm x 85.54mm), while the SPXI025.TXM measures 0.406" Dia x 4.333" L (10.31mm x 110.06mm). Physical mounting space and holder compatibility must be verified before substitution.

Q: What certifications does the SPXI025.TXM carry?

A: The SPXI025.TXM holds CE, gPV, UL, and UR certifications, meeting current solar photovoltaic system regulatory requirements.

Q: Why is the SPXI025.T classified as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. The SPXI025.TXM represents the active equivalent within the same product series.