SPXI030.L Equivalent & Substitute Parts

Part Overview

The SPXI030.L is a 30A 1.5 kVDC cartridge fuse manufactured by Littelfuse Inc. as part of the POWR-GARD® SPXI series. This free-hanging inline fuse is designed for solar photovoltaic applications and features intrinsic safety characteristics. The part is currently obsolete, making identification of suitable substitute components essential for system maintenance and component replacement in existing installations.

Substiute Parts

SPXI030.L

Littelfuse Inc.In Stock: 803SPXI030.L Datasheet

Current PartRFQ

SPXI030-M

Littelfuse Inc.In Stock: 1271SPXI030-M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPXI030.L is determined by the following critical electrical and mechanical parameters:

• Current Rating: 30A (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)
• Application: Solar (Photovoltaic) systems

The SPXI030-M qualifies as a direct substitute because it maintains identical electrical ratings (30A, 1.5 kVDC), fuse type (cartridge), mounting configuration (free hanging inline), and package form factor. Both components are from the same POWR-GARD® SPXI series and are designed for identical application environments.

Parameter Comparison

Engineering Selection Recommendations

The SPXI030-M is the manufacturer-recommended substitute for the obsolete SPXI030.L. Both components maintain identical electrical specifications (30A, 1.5 kVDC) and are designed for the same application category (solar photovoltaic systems). The SPXI030-M is currently in active production status, ensuring availability for replacement and new installations.

Key considerations for selection:

• The SPXI030-M has a higher breaking capacity (30 kA versus 15 kA), providing enhanced fault protection capability.
• The SPXI030-M is specified as Fast Blow response, whereas the SPXI030.L response time is not documented.
• Physical dimensions differ between the two parts. The SPXI030-M is smaller in diameter (0.406" versus 0.540") but longer in length (4.333" versus 3.370"). Mechanical fit within the host equipment must be verified.
• Both components are ROHS3 compliant and suitable for the same regulatory environments.
• The SPXI030-M includes additional approval certifications (CE, gPV, UR) and REACH compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can the SPXI030-M be used as a direct replacement for the SPXI030.L in existing solar photovoltaic systems?

A: Yes, the SPXI030-M is the manufacturer-recommended substitute. Both components have identical electrical ratings (30A, 1.5 kVDC) and are designed for solar photovoltaic applications. Physical dimensions must be verified for mechanical compatibility within the specific equipment housing.

Q: What is the significance of the higher breaking capacity in the SPXI030-M (30 kA versus 15 kA)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at its rated voltage. The SPXI030-M's higher breaking capacity (30 kA) provides enhanced protection in systems with higher available fault currents. This is an improvement over the original part and does not create compatibility issues.

Q: Are there dimensional compatibility concerns when substituting the SPXI030-M for the SPXI030.L?

A: Yes. The SPXI030-M has different physical dimensions (0.406" Dia x 4.333" L) compared to the SPXI030.L (0.540" Dia x 3.370" L). The substitute is smaller in diameter but longer in length. Mechanical fit within the fuse holder or cartridge housing must be confirmed before installation.

Q: What does "Fast Blow" response time mean for the SPXI030-M?

A: Fast Blow indicates the fuse will open quickly when exposed to overcurrent conditions. This characteristic is appropriate for solar photovoltaic circuit protection and is consistent with the application requirements of the original SPXI030.L.

Q: Are both components compliant with current regulatory standards?

A: Yes. Both the SPXI030.L and SPXI030-M are ROHS3 compliant. The SPXI030-M additionally carries CE, gPV, and UR certifications, and is documented as REACH unaffected, providing broader regulatory coverage for international applications.