SPXI030.T Equivalent & Substitute Parts Reference

Part Overview

The SPXI030.T is a 30A 1.5 kVDC cartridge fuse manufactured by Littelfuse Inc., designed for solar photovoltaic applications with intrinsically safe features. This part operates as a free-hanging inline fuse with a breaking capacity of 15 kA at rated voltage. The SPXI030.T is currently classified as obsolete, making identification of active equivalent parts essential for system maintenance and new installations where this specification is required.

Substiute Parts

SPXI030.T

Littelfuse Inc.In Stock: 956SPXI030.T Datasheet

Current PartRFQ

SPXI030.TXM

Littelfuse Inc.In Stock: 913SPXI030.TXM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPXI030.T is determined by strict equivalence across the following critical 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) (exact match required)

The SPXI030.TXM qualifies as a direct substitute because it maintains all critical electrical and mechanical parameters while offering enhanced performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The SPXI030.TXM is the recommended substitute for the obsolete SPXI030.T based on the following engineering criteria:

Product Status: The SPXI030.T is obsolete, while the SPXI030.TXM maintains active product status with current manufacturing support and availability.

Electrical Equivalence: Both parts maintain identical current rating (30A) and voltage rating (1.5 kVDC), ensuring functional compatibility in solar photovoltaic circuits.

Compliance & Certifications: The SPXI030.TXM carries multiple approval agencies (CE, gPV, UL, UR), providing broader regulatory acceptance compared to the main part. Both parts maintain RoHS compliance.

Mechanical Compatibility: Both parts use identical mounting type (Free Hanging In-Line) and package configuration (Cartridge, Inline, Double Ended), ensuring physical interchangeability in existing installations.

Performance Enhancement: The SPXI030.TXM provides increased breaking capacity (50 kA versus 15 kA), offering superior fault protection in high-energy solar systems.

Physical Dimensions: The SPXI030.TXM has different physical dimensions (0.406" Dia x 4.333" L versus 0.540" Dia x 3.370" L). Physical space verification is required before installation.

Frequently Asked Questions (FAQ)

Q: Can the SPXI030.TXM be used as a direct replacement for the SPXI030.T in existing solar installations?

A: Yes. Both parts maintain identical electrical specifications (30A, 1.5 kVDC) and mounting configuration (Free Hanging In-Line Cartridge). Physical dimensions differ; verify available space in the fuse holder before installation.

Q: What is the significance of the increased breaking capacity in the SPXI030.TXM?

A: The SPXI030.TXM provides 50 kA breaking capacity compared to the SPXI030.T's 15 kA. This represents enhanced fault protection capability in high-energy photovoltaic systems. Both values are rated at 1.5 kVDC.

Q: Are there compatibility concerns with the different physical dimensions?

A: The SPXI030.TXM measures 0.406" Dia x 4.333" L, while the SPXI030.T measures 0.540" Dia x 3.370" L. Verify that the fuse holder accommodates the substitute part's dimensions before installation.

Q: Does the SPXI030.TXM's "Fast Blow" response time affect circuit operation?

A: The SPXI030.TXM is specified as Fast Blow. Confirm that the circuit design accommodates this response characteristic. The main part's response time is not specified in available documentation.

Q: What certifications does the SPXI030.TXM carry?

A: The SPXI030.TXM carries CE, gPV, UL, and UR approvals, providing compliance for European, photovoltaic, North American, and Russian regulatory requirements.

Q: Is the SPXI030.T still available for purchase?

A: The SPXI030.T is classified as obsolete. The SPXI030.TXM is the active equivalent with current manufacturing and distribution support.