SPNH315.X3L Equivalent & Substitute Parts Reference

Part Overview

The SPNH315.X3L is a 315A 1.5 kVDC photovoltaic fuse manufactured by Littelfuse Inc. under the POWR-GARD® SPNH series. This rectangular blade fuse is designed for solar (photovoltaic) applications requiring fast-blow response characteristics and high breaking capacity at rated voltage. The part is currently obsolete, making identification of functionally equivalent substitutes essential for system maintenance, repair, and new installations where legacy component specifications must be maintained.

Substiute Parts

SPNH315.X3L

Littelfuse Inc.In Stock: 1022SPNH315.X3L Datasheet

Current PartRFQ

PV-315A-3L-U-15

Eaton - Bussmann Electrical DivisionIn Stock: 1163PV-315A-3L-U-15 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPNH315.X3L is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 315A
• Voltage Rating (DC): 1.5 kVDC
• Mounting Type: Requires Holder
• Package / Case: Rectangular, Blade
• Application Category: Solar (Photovoltaic)

Compliance Parameters:

• Approval Agency certifications (gPV certification required for photovoltaic applications)
• RoHS compliance status

The substitute part PV-315A-3L-U-15 manufactured by Eaton - Bussmann Electrical Division meets all mandatory matching parameters and maintains compliance with photovoltaic application standards. Physical dimensions remain within acceptable tolerance ranges for holder compatibility.

Parameter Comparison

Engineering Selection Recommendations

The PV-315A-3L-U-15 is the designated manufacturer-recommended substitute for the obsolete SPNH315.X3L. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical current rating (315A) and voltage rating (1.5 kVDC), ensuring direct functional replacement in photovoltaic circuit protection applications.

Compliance and Certification: The substitute part carries gPV class certification, which is the industry standard for photovoltaic fuses. This certification ensures compliance with photovoltaic-specific safety and performance requirements.

Product Status: The SPNH315.X3L is obsolete with no active manufacturing. The PV-315A-3L-U-15 is an active product with confirmed inventory availability (1108 pcs), ensuring long-term supply continuity.

Breaking Capacity: The substitute part provides 100 kA breaking capacity at rated voltage, which exceeds the original part's 30 kA specification. This represents an enhancement in fault protection capability without compromising circuit protection coordination.

Physical Compatibility: Dimensional variations (127.00 x 75.00 x 75.00 mm versus 131.20 x 73.00 x 73.00 mm) remain within acceptable tolerance ranges for standard rectangular blade fuse holders used in photovoltaic installations.

Frequently Asked Questions (FAQ)

Q: Can the PV-315A-3L-U-15 be used as a direct replacement for the SPNH315.X3L in existing photovoltaic systems?

A: Yes. Both parts share identical current rating (315A), voltage rating (1.5 kVDC), mounting type (requires holder), and package configuration (rectangular blade). The substitute is compatible with standard fuse holders designed for the original part.

Q: What is the significance of the gPV certification on the substitute part?

A: gPV certification indicates that the fuse meets the specific safety and performance standards established for photovoltaic applications. This certification is required for photovoltaic circuit protection and ensures compliance with industry standards for solar installations.

Q: Why does the substitute part have a higher breaking capacity (100 kA vs. 30 kA)?

A: The increased breaking capacity of the substitute part represents an enhancement in fault protection capability. This does not affect compatibility or circuit protection coordination in standard photovoltaic applications and provides additional safety margin.

Q: Are there dimensional differences between the two parts, and do they affect holder compatibility?

A: Minor dimensional variations exist (length: 131.20 mm vs. 127.00 mm; width/height: 73.00 mm vs. 75.00 mm). These variations remain within acceptable tolerance ranges for standard rectangular blade fuse holders and do not compromise mechanical fit or electrical performance.

Q: What is the product status difference, and why does it matter?

A: The SPNH315.X3L is obsolete and no longer manufactured. The PV-315A-3L-U-15 is an active product with confirmed inventory availability. This ensures reliable supply for replacement and new installations.

Q: Are both parts RoHS compliant?

A: The SPNH315.X3L is ROHS3 compliant. The substitute part (PV-315A-3L-U-15) does not specify RoHS status in the provided data. Verification of RoHS compliance with the manufacturer is recommended if this requirement is critical for your application.