5HT 10 Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The 5HT 10 is a 10A 250VAC ceramic cartridge fuse manufactured by Bel Fuse Inc., designed for 5mm x 20mm holder applications with slow-blow response characteristics. The part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. Direct replacements and functionally equivalent alternatives are available from multiple manufacturers with active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Current Rating	10 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	1.5kA
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters: current rating (10A), AC voltage rating (250V), fuse type (cartridge ceramic), physical package (5mm x 20mm), and response time (slow blow). Parts are classified into two categories:

Direct Equivalents maintain all critical electrical and mechanical parameters identical to the 5HT 10, ensuring drop-in replacement capability without circuit modification.

Functionally Compatible Alternatives meet the core electrical requirements (10A, 250VAC, 5x20mm, slow blow) but may include additional DC voltage ratings or minor variations in secondary parameters such as melting I²t or breaking capacity. These parts are suitable for applications where the additional specifications do not conflict with system design constraints.

Parameter Comparison

Parameter	5HT 10	5HT 10-R	0001.2514	0034.2526	0215010.HXP	BK1/S505-10-R
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	SCHURTER Inc.	SCHURTER Inc.	Littelfuse Inc.	Eaton - Electronics Division
Current Rating (A)	10	10	10	10	10	10
Voltage Rating - AC (V)	250	250	250	250	250	250
Voltage Rating - DC (V)	-	-	150	125	-	-
Response Time	Slow Blow	Slow Blow	Slow Blow	Medium Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5kA	1.5kA	1kA AC, 1.5kA DC	300A	1.5kA	1.5kA
Melting I²t	601	601	400	430	334.665	397
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C	-
DC Cold Resistance (Ohms)	0.007	0.007	-	-	0.0066	0.0061
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

5HT 10-R (Bel Fuse Inc.) is the primary direct equivalent. Manufactured by the same supplier as the original part, it maintains identical electrical specifications (10A, 250VAC, 1.5kA breaking capacity, 601 melting I²t) and physical dimensions. The part is active in production with ROHS3 compliance and expanded certification coverage (CE, CSA, cURus, PSE), making it the preferred choice for direct replacement applications.

0215010.HXP (Littelfuse Inc.) provides full electrical and mechanical compatibility with identical slow-blow response and 1.5kA breaking capacity. It offers the broadest certification portfolio (CE, CSA, KC, PSE, SEMKO, UL, VDE) and ROHS3 compliance. The melting I²t value (334.665) is lower than the original specification, requiring verification that this does not affect circuit protection timing in applications with specific inrush current profiles.

0001.2514 (SCHURTER Inc.) meets all core electrical requirements with the addition of 150V DC rating capability. Breaking capacity is specified as 1kA AC and 1.5kA DC. The melting I²t (400) differs from the original, and this part is suitable only for applications where DC voltage exposure is present or anticipated.

BK1/S505-10-R (Eaton - Electronics Division) maintains full compatibility with identical slow-blow response and 1.5kA breaking capacity. It carries extensive certifications (BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, VDE) and ROHS3 compliance. Operating temperature range is not specified in available data.

0034.2526 (SCHURTER Inc.) is classified as a functionally compatible alternative due to medium-blow response time, which differs from the original slow-blow characteristic. This part is suitable only for applications where medium-blow response is acceptable. The operating temperature range (-40°C ~ 85°C) is narrower than the original specification, and breaking capacity (300A) is significantly lower. Use is restricted to applications where these parameter differences do not conflict with system requirements.

Frequently Asked Questions (FAQ)

Q: Can 5HT 10-R be used as a direct replacement for 5HT 10?

A: Yes. The 5HT 10-R is manufactured by Bel Fuse Inc. and maintains identical electrical specifications, physical dimensions, and response characteristics. It is the direct equivalent for drop-in replacement.

Q: What is the difference between slow-blow and medium-blow response times?

A: Response time determines how quickly the fuse element melts under overcurrent conditions. Slow-blow fuses tolerate temporary inrush currents before melting, while medium-blow fuses respond faster to sustained overcurrent. The 0034.2526 uses medium-blow response and is not interchangeable with the original 5HT 10 in circuits designed for slow-blow protection.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The original 5HT 10 is RoHS non-compliant. If RoHS compliance is a system requirement, any of the listed substitutes satisfy this criterion.

Q: What does melting I²t represent, and why does it vary between parts?

A: Melting I²t is a thermal characteristic that indicates the energy required to melt the fuse element. It is used to calculate protection coordination in circuits with multiple fuses. Variations in melting I²t between substitute parts may affect circuit protection timing. For applications with specific inrush current profiles or protection coordination requirements, verify that the substitute part's melting I²t is compatible with system design parameters.

Q: Can parts with DC voltage ratings be used in AC-only applications?

A: Yes. Parts with DC voltage ratings (0001.2514 with 150V DC, 0034.2526 with 125V DC) can be used in AC-only applications. The DC rating represents an additional capability and does not restrict AC operation. However, verify that other parameters such as response time and breaking capacity remain compatible with the application.

Q: What is the significance of breaking capacity?

A: Breaking capacity specifies the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard. The original 5HT 10 has a breaking capacity of 1.5kA at rated voltage. All direct equivalents maintain this specification. The 0034.2526 has a significantly lower breaking capacity (300A) and is suitable only for applications where the maximum available fault current does not exceed this limit.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts are supplied in bulk packaging and maintain the 5mm x 20mm physical form factor, ensuring mechanical compatibility with existing holders and mounting hardware.

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