SPNH350.X3LDL Equivalent & Substitute Parts Reference

Part Overview

The SPNH350.X3LDL is a 350A 1.5 kVDC photovoltaic fuse manufactured by Littelfuse Inc. in the POWR-GARD® SPNH series. This rectangular bolt-mount fuse is designed for solar (photovoltaic) applications with fast-blow response characteristics and a breaking capacity of 30kA at rated voltage. The product is currently obsolete, making identification of equivalent substitute parts essential for system maintenance, repair, and replacement applications in operational photovoltaic installations.

Substiute Parts

SPNH350.X3LDL

Littelfuse Inc.In Stock: 898SPNH350.X3LDL Datasheet

Current PartRFQ

PV-350A-3L-BU-15

Eaton - Bussmann Electrical DivisionIn Stock: 812PV-350A-3L-BU-15 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPNH350.X3LDL is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 350A
• Voltage Rating (DC): 1.5 kVDC
• Mounting Type: Bolt Mount
• Application Category: Solar (Photovoltaic)
• Package Type: Rectangular, Blade

Compliance Parameters:

• Approval certifications must include gPV for photovoltaic applications
• RoHS and REACH compliance status must be compatible with system requirements

The PV-350A-3L-BU-15 from Eaton - Bussmann Electrical Division meets all mandatory matching parameters and is classified as an active product with current manufacturing support, making it a direct functional equivalent for the obsolete SPNH350.X3LDL.

Parameter Comparison

Engineering Selection Recommendations

The PV-350A-3L-BU-15 is the appropriate substitute for the obsolete SPNH350.X3LDL based on the following engineering criteria:

Electrical Equivalence: Both fuses maintain identical current rating (350A) and voltage rating (1.5 kVDC), ensuring proper circuit protection in photovoltaic systems.

Mechanical Compatibility: Both components feature bolt-mount installation with rectangular blade packaging, allowing direct installation in existing mounting infrastructure.

Certification Alignment: Both products carry gPV certification, confirming suitability for photovoltaic applications under relevant standards.

Product Availability: The PV-350A-3L-BU-15 maintains active product status with current manufacturing support, ensuring long-term availability for replacement and maintenance operations.

Performance Characteristics: The substitute part provides higher breaking capacity (100kA versus 30kA) and increased melting I²t (195000 versus 75000), offering enhanced performance margins within the same electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can the PV-350A-3L-BU-15 be directly installed in place of the SPNH350.X3LDL?

A: Yes. Both fuses share identical current rating (350A), voltage rating (1.5 kVDC), mounting type (bolt mount), and blade packaging configuration. Direct installation is mechanically and electrically compatible.

Q: What is the difference between rectangular and square fuse types in this comparison?

A: The SPNH350.X3LDL is classified as rectangular; the PV-350A-3L-BU-15 is classified as square. Both utilize rectangular blade packaging for mounting purposes. The fuse type designation refers to the overall body profile, which does not affect bolt-mount compatibility or electrical performance in this application.

Q: Why does the PV-350A-3L-BU-15 have a higher breaking capacity (100kA versus 30kA)?

A: The substitute part is engineered with enhanced fault-current handling capability. This represents an improvement over the original design and does not compromise compatibility. Higher breaking capacity provides additional safety margin in photovoltaic systems.

Q: Are both fuses certified for photovoltaic applications?

A: Yes. Both the SPNH350.X3LDL and PV-350A-3L-BU-15 carry gPV certification, confirming compliance with photovoltaic-specific standards and requirements.

Q: What is the significance of the melting I²t difference?

A: Melting I²t (75000 for SPNH350.X3LDL versus 195000 for PV-350A-3L-BU-15) indicates the thermal energy required to melt the fuse element. The higher value in the substitute part reflects a more robust fuse element design while maintaining the same current and voltage ratings.

Q: Is the PV-350A-3L-BU-15 available for immediate procurement?

A: The PV-350A-3L-BU-15 maintains active product status with 740 pieces in current inventory, ensuring availability for immediate procurement and deployment.