Equivalent & Substitute Parts for 5SFP 6.3

Part Overview

The 5SFP 6.3 is a 6.3 A 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and component procurement. The fuse is designed for through-hole mounting applications requiring fast-response overcurrent protection in industrial and commercial equipment.

Substiute Parts

5SFP 6.3

Bel Fuse Inc.In Stock: 9515SFP 6.3 Datasheet

Current PartRFQ

5SFP 6.3-R

Bel Fuse Inc.In Stock: 18435SFP 6.3-R Datasheet

DirectRFQ

0034.1524.PT

SCHURTER Inc.In Stock: 18890034.1524.PT Datasheet

DirectRFQ

021706.3MXEP

LittelfuseIn Stock: 1353021706.3MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5SFP 6.3 is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 6.3 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 63 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these criteria and are therefore electrically and mechanically interchangeable with the original 5SFP 6.3.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the 5SFP 6.3, the following active alternatives are available:

5SFP 6.3-R (Bel Fuse Inc.) is the direct successor from the original manufacturer, maintaining identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. This part is the preferred choice for direct replacement where manufacturer continuity is required.

0034.1524.PT (SCHURTER Inc.) and 021706.3MXEP (Littelfuse) are functionally equivalent alternatives from established fuse manufacturers. Both parts are active products with ROHS3 compliance and comprehensive international approvals. Selection between these alternatives may be based on supply chain availability, lead time, or existing vendor relationships.

All substitute parts carry appropriate regulatory certifications (CE, CSA, VDE, or equivalent) suitable for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the 5SFP 6.3-R be used as a direct replacement for the obsolete 5SFP 6.3?

A: Yes. The 5SFP 6.3-R is electrically and mechanically identical to the 5SFP 6.3, with matching current rating, voltage rating, response time, package dimensions, and breaking capacity. The primary difference is product status (active vs. obsolete) and improved RoHS compliance.

Q: What are the key parameters that determine fuse substitutability?

A: Substitution requires exact matching of current rating (6.3 A), voltage rating (250 V), fuse type (cartridge, glass), response time (fast blow), package dimensions (5mm x 20mm axial), and breaking capacity (63 A). All listed alternatives meet these criteria.

Q: Are there dimensional differences between the substitute parts?

A: Minor dimensional variations exist. The 5SFP 6.3 measures 0.217" Dia x 0.827" L (5.50mm x 21.00mm). The 0034.1524.PT measures 0.213" Dia x 0.886" L (5.40mm x 22.50mm), and the 021706.3MXEP measures 0.228" Dia x 0.886" L (5.80mm x 22.50mm). These variations remain within the 5mm x 20mm nominal package specification and do not affect through-hole mounting compatibility.

Q: Which substitute part offers the best compliance profile?

A: All active substitute parts (5SFP 6.3-R, 0034.1524.PT, and 021706.3MXEP) are ROHS3 compliant and REACH unaffected. The 021706.3MXEP carries the broadest international approvals (BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, VDE), while 5SFP 6.3-R includes CCC and cULus certifications. Selection should align with target market regulatory requirements.

Q: Is the obsolete 5SFP 6.3 still available for procurement?

A: The 5SFP 6.3 is listed as obsolete. However, 855 pieces are reported in stock as new original inventory. For new designs or long-term supply assurance, transition to an active substitute part is recommended.