5HT 2 Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 5HT 2 is a 2A 250VAC ceramic cartridge fuse manufactured by Bel Fuse Inc., designed for 5mm x 20mm holder applications. This part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. The fuse provides slow-blow response characteristics with a 1.5kA breaking capacity at rated voltage, suitable for general circuit protection in AC/DC applications requiring ceramic construction and holder-based mounting.

Substiute Parts

5HT 2

Bel Fuse Inc.In Stock: 11105HT 2 Datasheet

Current PartRFQ

5HT 2-R

Bel Fuse Inc.In Stock: 398825HT 2-R Datasheet

DirectRFQ

0001.2507

SCHURTER Inc.In Stock: 103730001.2507 Datasheet

DirectRFQ

0215002.HXP

Littelfuse Inc.In Stock: 14540215002.HXP Datasheet

SimilarRFQ

0215002.TXP

Littelfuse Inc.In Stock: 8660215002.TXP Datasheet

SimilarRFQ

BK1/S505-2-R

Eaton - Electronics DivisionIn Stock: 2865BK1/S505-2-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5HT 2 is determined by strict alignment with the following parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, and dimensional tolerances are within acceptable engineering ranges for this product category and do not affect functional interchangeability in standard holder applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 5HT 2-R (Bel Fuse Inc.)

The 5HT 2-R is the direct active-production equivalent from the original manufacturer. It maintains identical electrical and mechanical specifications to the 5HT 2 while offering ROHS3 compliance and active product status. This part is preferred for applications requiring manufacturer continuity and is available in bulk packaging with substantial inventory (39,822 pcs).

Secondary Recommendations:

• 0215002.HXP or 0215002.TXP (Littelfuse Inc.): Both parts meet all substitution criteria with ROHS3 compliance and active status. Littelfuse 215 series fuses are widely used in industrial and consumer applications. Melting I²t values (11.68) are slightly elevated compared to the original specification (9.7), which may affect response characteristics in sensitive circuits but remain within acceptable ranges for standard protection applications.

• BK1/S505-2-R (Eaton - Electronics Division): Eaton S505 series ceramic fuses provide equivalent functionality with the lowest DC cold resistance (0.0545 Ohms) among all substitutes. This part carries the broadest approval agency certifications (BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, VDE) and is suitable for applications requiring multiple regional compliance standards.

• 0001.2507 (SCHURTER Inc.): This part offers the advantage of rated DC voltage specification (300 V DC), providing additional protection margin in mixed AC/DC applications. SCHURTER SPT 5x20 series fuses are commonly used in European industrial equipment. Melting I²t (9.2) is closest to the original specification.

All substitute parts are functionally interchangeable in standard 5mm x 20mm holder applications where the 5HT 2 was originally specified.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in place of the 5HT 2?

A: Yes. All listed substitute parts meet the critical substitution parameters: 2A current rating, 250VAC voltage rating, 5mm x 20mm package, ceramic cartridge type, slow-blow response, and holder-based mounting. Physical and electrical interchangeability is confirmed.

Q: What is the difference between the 5HT 2 and 5HT 2-R?

A: The 5HT 2-R is the active-production version of the same part. Both share identical electrical specifications and dimensions. The primary difference is product status (obsolete vs. active) and RoHS compliance (non-compliant vs. ROHS3 compliant). The 5HT 2-R is the recommended direct replacement.

Q: Why do the Littelfuse parts (0215002.HXP and 0215002.TXP) have higher melting I²t values?

A: Melting I²t represents the thermal energy required to melt the fuse element. Littelfuse 215 series fuses have slightly higher values (11.68 vs. 9.7), which means they tolerate marginally longer overcurrent durations before opening. This difference is within acceptable engineering tolerance for general-purpose circuit protection and does not affect compatibility in standard applications.

Q: Does the SCHURTER 0001.2507 have any advantages?

A: The 0001.2507 includes a rated DC voltage specification (300 V DC) in addition to the 250 V AC rating. This provides additional protection margin in applications with mixed AC/DC exposure. Its melting I²t (9.2) is closest to the original 5HT 2 specification (9.7), making it suitable for circuits with tight thermal response requirements.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original 5HT 2 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the substitute parts will satisfy this criterion.

Q: Which substitute part has the broadest international approvals?

A: The Eaton BK1/S505-2-R carries the most comprehensive approval agency certifications: BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, and VDE. This makes it the preferred choice for applications requiring multi-regional compliance documentation.

Q: Can I mix different substitute parts in the same circuit or equipment?

A: Yes. All substitute parts are electrically and mechanically equivalent. However, for consistency and simplified inventory management, using a single substitute part across an application is recommended.