Littelfuse SPXV030.TXS 1500VDC 30A Photovoltaic Fuse

Part Overview

The SPXV030.TXS is a 30A 1.5 kVDC photovoltaic fuse cartridge from Littelfuse Inc., part of the POWR-GARD® SPXV-S series. This fast-blow cartridge fuse is designed for solar (photovoltaic) applications requiring DC protection at 1500V ratings. The product has reached obsolete status, necessitating identification of active substitute components that maintain electrical and mechanical compatibility with existing installations and new designs.

Substiute Parts

SPXV030.TXS

Littelfuse Inc.In Stock: 1072SPXV030.TXS Datasheet

Current PartRFQ

SPXV030.LXM

Littelfuse Inc.In Stock: 787SPXV030.LXM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPXV030.TXS requires equivalence across critical electrical parameters: 30A current rating, 1.5 kVDC voltage rating, fast-blow response time, and cartridge form factor. The substitute component must maintain identical current and voltage ratings to ensure protection coordination and system safety in photovoltaic applications. Cartridge fuse type and holder-mounted installation method are mechanical requirements that must be preserved. Approval certifications (CE, gPV, UL) confirm compliance with photovoltaic system standards. Breaking capacity and melting I²t values determine thermal performance during fault conditions and must remain functionally equivalent within accepted engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

The SPXV030.LXM serves as the active substitute for the obsolete SPXV030.TXS. Both components maintain identical electrical specifications: 30A current rating, 1.5 kVDC voltage rating, and fast-blow response time. The substitute provides enhanced breaking capacity (50 kA versus 30 kA), representing improved fault-handling capability. DC cold resistance values remain effectively equivalent (0.0052 versus 0.00526 Ohms), with negligible impact on circuit behavior. Melting I²t values are nearly identical (3770 versus 3792), ensuring equivalent thermal response during overcurrent conditions. Both parts carry identical photovoltaic system approvals (CE, gPV, UL), confirming compliance with international solar installation standards. The SPXV030.LXM offers additional RoHS compliance status. Physical dimensions differ slightly; the substitute's reduced length (0.406" versus 0.540") may require verification against holder specifications in legacy equipment, though both maintain the same 3.333" width dimension for standard cartridge holders.

Frequently Asked Questions (FAQ)

Q: Can the SPXV030.LXM directly replace the SPXV030.TXS in existing installations?

A: The SPXV030.LXM maintains electrical equivalence with identical 30A, 1.5 kVDC, and fast-blow specifications. Mechanical compatibility depends on the cartridge holder used. The physical dimension difference (0.406" L vs. 0.540" L) must be verified against the specific holder model, as both length and diameter tolerances affect fit within the holder assembly.

Q: What determines whether a substitute fuse is acceptable for photovoltaic systems?

A: Substitution requires matching current rating (30A), voltage rating (1.5 kVDC), fuse type (cartridge), response time (fast-blow), and approval certifications (CE, gPV, UL). These parameters ensure protection coordination and compliance with solar installation codes. Breaking capacity must support the system's maximum fault current.

Q: Why does the SPXV030.LXM have a higher breaking capacity than the original part?

A: The substitute's 50 kA breaking capacity (versus 30 kA) represents a design enhancement in fault-handling capability. This improvement does not affect compatibility but rather provides better protection margins in systems experiencing higher short-circuit currents.

Q: Are there differences in thermal behavior between these two fuses?

A: The melting I²t values are nearly equivalent (3770 versus 3792), indicating virtually identical thermal response during overcurrent conditions. DC cold resistance differences (0.0052 versus 0.00526 Ohms) are negligible for circuit design purposes.

Q: What is the significance of RoHS compliance on the substitute part?

A: The SPXV030.LXM carries RoHS Compliant status, confirming the absence of restricted hazardous substances. This certification supports compliance with environmental regulations for equipment manufactured or sold in regions with RoHS requirements, making it suitable for modern equipment designs.