Equivalent & Substitute Parts for 5HTP 6.3

Part Overview

The 5HTP 6.3 is a ceramic cartridge fuse rated at 6.3 A, 250 V AC, with a 5mm x 20mm axial form factor and slow-blow response characteristics. Manufactured by Bel Fuse Inc., this component is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain circuit protection functionality in applications where the original part is no longer available through standard distribution channels.

Substiute Parts

5HTP 6.3

Bel Fuse Inc.In Stock: 11645HTP 6.3 Datasheet

Current PartRFQ

5HT 8-R

Bel Fuse Inc.In Stock: 60915HT 8-R Datasheet

DirectRFQ

5HTP 6.3-R

Bel Fuse Inc.In Stock: 31645HTP 6.3-R Datasheet

DirectRFQ

0001.2512.PT

SCHURTER Inc.In Stock: 41570001.2512.PT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5HTP 6.3 is determined by the following critical parameters:

• Current Rating: 6.3 A (exact match required for circuit protection integrity)
• Voltage Rating (AC): 250 V (minimum requirement; higher ratings acceptable)
• Package / Case: 5mm x 20mm (physical and electrical compatibility)
• Fuse Type: Cartridge, Ceramic (functional equivalence)
• Response Time: Slow Blow (load profile compatibility)
• Breaking Capacity: 1.5 kA (fault current handling capability)
• Mounting Type: Through Hole (mechanical fit in existing holders)

Parts meeting all these criteria are classified as direct substitutes. The 5HTP 6.3-R (Bel Fuse Inc.) and 0001.2512.PT (SCHURTER Inc.) satisfy these requirements. The 5HT 8-R, while sharing the same package and manufacturer, operates at a different current rating (8 A) and therefore functions as an alternative only in applications where the higher current rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete 5HTP 6.3, the 5HTP 6.3-R is the primary choice. It maintains identical electrical specifications, current rating, voltage rating, and thermal characteristics while offering active product status and full RoHS3 compliance. Approval certifications are comprehensive and include all agencies listed for the original part.

The 0001.2512.PT (SCHURTER Inc.) provides an alternative direct substitute with matching current and voltage ratings, identical package dimensions, and active product status. This part adds DC voltage rating capability (150 V DC) and maintains RoHS3 compliance. The melting I²t value (171) is slightly lower than the main part (181), indicating marginally faster thermal response. Approval coverage is limited to cURus.

The 5HT 8-R operates at 8 A and is not a direct substitute for the 6.3 A rating. This part is suitable only in applications where circuit protection requirements permit the higher current threshold. The mounting type designation (Requires Holder) differs from the Through Hole specification of the main part, requiring mechanical compatibility verification.

Frequently Asked Questions (FAQ)

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

A: Yes. The 5HTP 6.3-R is a direct substitute. Both parts share identical current rating (6.3 A), voltage rating (250 V AC), package dimensions (5mm x 20mm axial), response time (slow blow), and breaking capacity (1.5 kA). The primary difference is product status: the original is obsolete while the 5HTP 6.3-R is active. RoHS3 compliance of the substitute represents an improvement over the non-compliant original.

Q: What is the difference between the 5HTP 6.3-R and the 0001.2512.PT?

A: Both are direct electrical substitutes for the 5HTP 6.3 with matching 6.3 A current rating and 250 V AC voltage rating. The 0001.2512.PT adds a 150 V DC rating, making it suitable for dual AC/DC applications. The melting I²t value differs slightly (171 vs. 181), indicating marginally different thermal response characteristics. Approval certifications differ: the 5HTP 6.3-R carries broader agency approvals (CCC, CE, CSA, cULus, PSE, SEMKO, VDE) compared to the 0001.2512.PT (cURus only).

Q: Is the 5HT 8-R a suitable substitute?

A: The 5HT 8-R is not a direct substitute due to its 8 A current rating versus the required 6.3 A. Use this part only in applications where the circuit design permits a higher fuse current threshold. The mounting type designation (Requires Holder) also differs from the Through Hole specification, requiring mechanical compatibility assessment.

Q: What certifications should I verify for regulatory compliance?

A: The 5HTP 6.3-R maintains all original certifications (CCC, CE, CSA, cULus, PSE, SEMKO, VDE). If your application requires specific agency approvals, confirm that the selected substitute carries the necessary certifications. The 0001.2512.PT carries cURus approval only and may not satisfy all regulatory requirements of the original design.

Q: Are there any thermal or resistance differences I should consider?

A: The DC cold resistance values are similar across all 6.3 A substitutes (0.01 to 0.013 Ohms), indicating negligible performance variation. The melting I²t value of the 0001.2512.PT (171) is slightly lower than the main part (181), representing a minor difference in thermal response. For most applications, this difference is not significant.