Bel Fuse Inc. 5HT 2.5 Ceramic Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5HT 2.5 is a 2.5 A, 250 V AC ceramic cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This part is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing system support and procurement. The substitute parts listed maintain functional compatibility through matching electrical ratings, mechanical dimensions, and thermal response profiles while offering active product status from current manufacturers.

Substiute Parts

5HT 2.5

Bel Fuse Inc.In Stock: 10495HT 2.5 Datasheet

Current PartRFQ

5HT 2.5-R

Bel Fuse Inc.In Stock: 80205HT 2.5-R Datasheet

DirectRFQ

0001.2508

SCHURTER Inc.In Stock: 11040001.2508 Datasheet

DirectRFQ

021502.5HXP

Littelfuse Inc.In Stock: 1350021502.5HXP Datasheet

SimilarRFQ

021502.5MXP

Littelfuse Inc.In Stock: 2318021502.5MXP Datasheet

SimilarRFQ

BK1/S505-2.5-R

Eaton - Electronics DivisionIn Stock: 1908BK1/S505-2.5-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5HT 2.5 is determined by strict alignment of the following parameters:

• Current Rating: 2.5 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)
• Breaking Capacity @ Rated Voltage: 1.5 kA (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 approval agency certifications do not preclude substitution but may influence selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 5HT 2.5-R (Bel Fuse Inc.)

The 5HT 2.5-R is the direct active equivalent from the original manufacturer. It maintains identical electrical and mechanical specifications to the obsolete 5HT 2.5, with the addition of ROHS3 compliance and cURus certification. This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendations:

021502.5HXP and 021502.5MXP (Littelfuse Inc., Series 215) are functionally equivalent alternatives with higher melting I²t values (22.29 vs. 17.4), indicating slightly slower thermal response. Both parts carry comprehensive international certifications including UL, CSA, and VDE. These parts are suitable for applications where the original thermal response profile is not critical.

0001.2508 (SCHURTER Inc., Series SPT 5x20) offers the additional advantage of 300 V DC rating, making it suitable for applications requiring dual AC/DC voltage compatibility. The lower melting I²t (11.7) indicates faster thermal response compared to the original part.

BK1/S505-2.5-R (Eaton - Electronics Division, Series S505) provides broad international certification coverage including BSI and CQC. The melting I²t of 16.6 closely matches the original specification.

All substitute parts are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 5HT 2.5?

A: Yes, all listed substitute parts meet the core electrical and mechanical requirements: 2.5 A current rating, 250 V AC voltage rating, 5mm x 20mm package, ceramic cartridge type, slow-blow response, and 1.5 kA breaking capacity. Differences in melting I²t and DC cold resistance are secondary parameters that do not affect AC circuit protection functionality.

Q: What is the difference between the Bel Fuse 5HT 2.5-R and the original 5HT 2.5?

A: The 5HT 2.5-R is the active production equivalent. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Electrical and mechanical specifications are identical.

Q: Why do some substitute parts have different melting I²t values?

A: Melting I²t reflects the thermal energy required to melt the fuse element and is influenced by element design and material composition. Variations between 11.7 and 22.29 indicate different thermal response profiles. For AC-only applications at rated voltage, this variation does not affect circuit protection performance. Applications with specific thermal response requirements should select parts with I²t values closest to the original specification.

Q: Does the SCHURTER 0001.2508 offer any advantage over other substitutes?

A: The 0001.2508 includes a 300 V DC rating in addition to the 250 V AC rating. This dual-voltage capability makes it suitable for applications requiring both AC and DC circuit protection. Other substitutes are rated for AC only.

Q: Are all substitute parts RoHS compliant?

A: Yes, all active substitute parts listed carry ROHS3 compliance. The original 5HT 2.5 is RoHS non-compliant, making the substitutes preferable for new designs and systems subject to RoHS requirements.

Q: Which substitute part has the broadest international certification coverage?

A: BK1/S505-2.5-R (Eaton) carries certifications from BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, and VDE. The Littelfuse parts (021502.5HXP and 021502.5MXP) also carry comprehensive coverage including UL, CSA, CE, and VDE certifications.

Q: Can these fuses be used in any holder designed for 5mm x 20mm cartridge fuses?

A: Yes, all parts require a holder and use the standard 5mm x 20mm form factor. They are mechanically compatible with any holder designed for this package size. Verify that the holder is rated for 250 V AC and 2.5 A minimum.