Bel Fuse Inc. 5HT 1 Ceramic Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5HT 1 is a 1 A, 250 V AC ceramic cartridge fuse with slow-blow response characteristics, designed for 5mm x 20mm holder mounting. This part is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and thermal response characteristics to ensure direct functional replacement without circuit redesign.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (1 A), AC voltage rating (250 V), fuse type (cartridge ceramic), response time (slow blow), physical package (5mm x 20mm), breaking capacity (1.5 kA), and operating temperature range (-55°C ~ 125°C). All identified substitutes meet these core electrical and mechanical requirements.

Direct Equivalent: 5HT 1-R (Bel Fuse Inc.) — identical part with active product status and improved RoHS3 compliance.

Cross-Manufacturer Equivalents: 0001.2504 (SCHURTER Inc.), 0215001.HXP (Littelfuse Inc.), 0215001.VXP (Littelfuse Inc.), and BK1/S505-1-R (Eaton - Electronics Division) — all maintain the specified electrical ratings, ceramic cartridge construction, slow-blow response, and 5mm x 20mm form factor.

Parameter Comparison

Parameter	5HT 1 (Main)	5HT 1-R	0001.2504	0215001.HXP	0215001.VXP	BK1/S505-1-R
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	SCHURTER Inc.	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division
Current Rating (Amps)	1 A	1 A	1 A	1 A	1 A	1 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow 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	1.5 kA	1.5 kA	1.5 kA	1.5 kA	1.5 kA	1.5 kA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

For new designs and procurement, 5HT 1-R (Bel Fuse Inc.) is the primary recommendation as the direct successor to the obsolete 5HT 1, maintaining identical electrical and mechanical specifications while offering active product status and ROHS3 compliance.

For applications requiring cross-manufacturer sourcing or inventory diversification, the following substitutes are qualified:

0001.2504 (SCHURTER Inc.) — Active status with ROHS3 compliance and comprehensive international certifications (CCC, cURus, KC, PSE/JET, VDE).

0215001.HXP and 0215001.VXP (Littelfuse Inc., Series 215) — Both active with ROHS3 compliance and extensive approval agency coverage (CCC, CE, CSA, KC, PSE, SEMKO, UL, VDE).

BK1/S505-1-R (Eaton - Electronics Division, Series S505) — Active status with RoHS compliance and the broadest certification portfolio (BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, VDE).

All substitutes are electrically and mechanically interchangeable within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can 5HT 1-R be used as a direct replacement for the obsolete 5HT 1?

A: Yes. 5HT 1-R is the active equivalent from the same manufacturer with identical current rating (1 A), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (slow blow), and 5mm x 20mm package dimensions. The primary difference is improved RoHS3 compliance status.

Q: What are the key parameters that determine substitutability?

A: Current rating (1 A), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (slow blow), physical dimensions (5mm x 20mm), breaking capacity (1.5 kA), and operating temperature range (-55°C ~ 125°C) must remain constant across all substitutes.

Q: Are cross-manufacturer substitutes (SCHURTER, Littelfuse, Eaton) fully compatible?

A: Yes. All identified cross-manufacturer parts maintain the same electrical ratings, ceramic construction, slow-blow characteristics, and 5mm x 20mm form factor. They are mechanically and electrically interchangeable within the specified parameter set.

Q: Does the 5mm x 20mm package dimension apply to all substitutes?

A: Yes. All substitutes use the standard 5mm x 20mm cartridge form factor and require the same holder type. Physical interchangeability is confirmed across all listed parts.

Q: What compliance certifications are common across all substitutes?

A: CCC, PSE, and VDE certifications are present across all active substitutes. Additional certifications vary by manufacturer but include CE, CSA, cURus, KC, SEMKO, and UL depending on the specific part.

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