SPNH250.X2XLDL - Equivalent & Substitute Parts

Part Overview

The SPNH250.X2XLDL is a 250A 1.5 kVDC photovoltaic fuse from Littelfuse Inc.'s POWR-GARD® SPNH series with rectangular bolt mount configuration. This component is classified as obsolete, requiring identification of suitable substitute parts for ongoing system design and replacement purposes. The obsolete status necessitates alternative component selection to ensure continued availability and system reliability in solar photovoltaic applications.

Substiute Parts

SPNH250.X2XLDL

Littelfuse Inc.In Stock: 725SPNH250.X2XLDL Datasheet

Current PartRFQ

PSX1XLUB0250X

Littelfuse Inc.In Stock: 876PSX1XLUB0250X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPNH250.X2XLDL is based on matching the following critical electrical and mechanical parameters:

• Current Rating: 250A (exact match required)
• Voltage Rating: 1.5 kVDC (exact match required)
• Response Time: Fast Blow (required for application protection profile)
• Mounting Type: Bolt Mount (mechanical compatibility)
• Regulatory Compliance: CE, UL certifications (minimum requirement)
• RoHS Compliance: ROHS3 (environmental requirement)

The primary substitute identified is the PSX1XLUB0250X, which maintains all critical electrical specifications while differing in physical form factor (square vs. rectangular) and application domain (semiconductors vs. photovoltaics).

Parameter Comparison

Engineering Selection Recommendations

The PSX1XLUB0250X is qualified as the manufacturer-recommended substitute for the SPNH250.X2XLDL. Both components share identical current and voltage ratings (250A, 1.5 kVDC) and maintain fast-blow response characteristics required for circuit protection.

The PSX1XLUB0250X carries active product status, ensuring continued availability and supply chain reliability. Both components maintain ROHS3 compliance and CE/UL certifications, satisfying regulatory requirements for industrial and renewable energy applications.

Physical form factor differs between the components: the SPNH250.X2XLDL features a rectangular configuration while the PSX1XLUB0250X employs a square form factor. Mechanical integration must account for this dimensional variance. The PSX1XLUB0250X demonstrates higher breaking capacity (200kA vs. 30kA) and provides an extended operating temperature specification (-55°C ~ 125°C), offering enhanced performance margins in demanding environmental conditions.

Frequently Asked Questions (FAQ)

Can the PSX1XLUB0250X directly replace the SPNH250.X2XLDL in existing assemblies?

Electrical compatibility is confirmed by matching current and voltage ratings, response time, and mounting type. Physical form factor differs (square vs. rectangular), requiring verification of mechanical fit within the installation envelope.

What are the critical parameters for substitution between these components?

Substitution eligibility is determined by: current rating (250A), DC voltage rating (1.5 kVDC), response time classification (fast blow), mounting configuration (bolt mount), and regulatory compliance (CE, UL). These parameters ensure protection function and system compatibility.

Why does the PSX1XLUB0250X have a higher breaking capacity?

The PSX1XLUB0250X is designed for semiconductor applications, which may impose different fault current requirements. Both components are rated for 1.5 kVDC systems and will operate within photovoltaic circuit requirements.

Is the melting I²t difference significant for application compatibility?

The melting I²t values (SPNH250.X2XLDL: 73000; PSX1XLUB0250X: 36552) reflect thermal response characteristics. Both components maintain the fast-blow designation and are suitable for the same circuit protection duties. System coordination analysis should be performed if precise thermal coordination requirements exist.

Are there differences in certifications between the components?

Both components hold CE and UL approval. The SPNH250.X2XLDL carries additional gPV and IEC certifications, while the PSX1XLUB0250X includes cURus certification. For photovoltaic applications, both certifications satisfy industry requirements.