SPXV030.LXS Equivalent & Substitute Parts

Part Overview

The SPXV030.LXS is a 30A 1.5 kVDC photovoltaic fuse cartridge manufactured by Littelfuse Inc. as part of the POWR-GARD® SPXV-S series. This component is designed for solar (photovoltaic) applications requiring fast-blow response characteristics and high breaking capacity. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system operation and maintenance.

Substiute Parts

SPXV030.LXS

Littelfuse Inc.In Stock: 731SPXV030.LXS Datasheet

Current PartRFQ

SPXV030.TXM

Littelfuse Inc.In Stock: 1066SPXV030.TXM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPXV030.LXS is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Non-Negotiable):

• Current Rating: 30A
• Voltage Rating (DC): 1.5 kVDC
• Response Time: Fast Blow
• Approval Agencies: CE, gPV, UL (photovoltaic-specific certifications)

Mechanical Parameters (Non-Negotiable):

• Fuse Type: Cartridge
• Mounting Type: Requires Holder
• Package/Case: Cartridge, Non-Standard

Application Compatibility:

• Primary Application: Solar (Photovoltaic)

The SPXV030.TXM qualifies as a direct substitute because it maintains identical electrical ratings (30A, 1.5 kVDC, Fast Blow), identical mechanical form factor (cartridge requiring holder), and identical application designation (solar/photovoltaic). The substitute part is manufactured by the same supplier (Littelfuse Inc.) and carries the same required certifications (CE, gPV, UL), ensuring compatibility with existing system designs and regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

The SPXV030.TXM is the direct manufacturer-recommended substitute for the obsolete SPXV030.LXS. Both components share identical electrical and mechanical specifications across all critical parameters required for photovoltaic circuit protection.

Compliance Considerations:

The SPXV030.TXM maintains active product status with current manufacturing support from Littelfuse Inc. The substitute part carries full CE, gPV, and UL certifications, meeting all regulatory requirements for solar applications. The SPXV030.TXM is RoHS compliant, providing additional environmental compliance for new system designs and replacements.

Performance Characteristics:

The SPXV030.TXM exhibits a higher breaking capacity (50 kA versus 30 kA) and marginally higher melting I²t (3792 versus 3770), representing enhanced performance margins without altering the fast-blow response characteristic or current/voltage ratings. DC cold resistance remains functionally equivalent (0.00526 Ohms versus 0.0052 Ohms).

Availability and Support:

The SPXV030.TXM is currently in active production with documented inventory availability, ensuring reliable procurement for replacement and new installations.

Frequently Asked Questions (FAQ)

Q: Can the SPXV030.TXM be used as a direct replacement for SPXV030.LXS in existing photovoltaic systems?

A: Yes. The SPXV030.TXM is electrically and mechanically identical to the SPXV030.LXS across all critical parameters: 30A current rating, 1.5 kVDC voltage rating, fast-blow response, cartridge form factor, and holder-mount configuration. Both components carry identical certifications (CE, gPV, UL) for solar applications.

Q: What is the significance of the higher breaking capacity in the SPXV030.TXM?

A: The SPXV030.TXM provides a breaking capacity of 50 kA compared to 30 kA in the SPXV030.LXS. This represents an enhanced safety margin for fault current interruption without affecting the fuse's response time or normal operating characteristics. The higher breaking capacity does not alter compatibility with existing system designs.

Q: Are there any physical dimension differences between these parts?

A: Both components are cartridge-type fuses requiring a holder. The SPXV030.LXS measures 0.540" Dia x 3.333" L (13.72mm x 84.65mm). The SPXV030.TXM measures 0.406" L x 3.333" W (10.31mm x 84.65mm). Both dimensions fall within the cartridge, non-standard package classification and are compatible with standard photovoltaic fuse holders designed for this form factor.

Q: What certifications apply to the SPXV030.TXM?

A: The SPXV030.TXM carries CE, gPV, and UL certifications, identical to the SPXV030.LXS. The gPV certification specifically designates this component for photovoltaic applications. The SPXV030.TXM is additionally RoHS compliant.

Q: Why is the SPXV030.LXS classified as obsolete?

A: The SPXV030.LXS is part of the POWR-GARD® SPXV-S series, which has been superseded by the active POWR-GARD® SPXV series. The SPXV030.TXM represents the current production equivalent within the updated product line, maintaining all functional and electrical specifications while offering enhanced performance characteristics and current manufacturing support.