5HFP 6.3 Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 5HFP 6.3 is a 6.3 A, 250 V AC/DC ceramic cartridge fuse manufactured by Bel Fuse Inc. with a 5mm x 20mm axial form factor and fast-blow response characteristics. The original part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct replacement in existing designs and production applications.

Key Parameters

Parameter	Value
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Fast Blow
Package / Case	5mm x 20mm (Axial)
Breaking Capacity @ Rated Voltage	1.5 kA
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: current rating (6.3 A), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (fast blow), breaking capacity (1.5 kA), and package dimensions (5mm x 20mm axial). All identified substitutes meet these core electrical and mechanical requirements. Physical dimensions may vary within manufacturing tolerances; however, all parts are designed for identical through-hole mounting applications. Melting I²t values and DC cold resistance differ among manufacturers but do not disqualify substitution when all primary parameters align.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response Time	Breaking Capacity (kA)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
5HFP 6.3	Bel Fuse Inc.	6.3	250	Fast Blow	1.5	70	0.012	Obsolete	Non-compliant
5HFP 6.3-R	Bel Fuse Inc.	6.3	250	Fast Blow	1.5	70	0.011	Active	ROHS3 Compliant
0001.1012.PT	SCHURTER Inc.	6.3	250	Fast Blow	1.5	36.7	—	Active	ROHS3 Compliant
021606.3MXEP	Littelfuse Inc.	6.3	250	Fast Blow	1.5	56.43	0.0137	Active	ROHS3 Compliant
021606.3MXESPP	Littelfuse Inc.	6.3	250	Fast Blow	1.5	56.43	0.0137	Active	ROHS3 Compliant
BK/GDA-V-6.3A	Eaton - Electronics Division	6.3	250	Fast Blow	1.5	48	0.014	Active	Non-compliant

Engineering Selection Recommendations

For new designs and production applications, 5HFP 6.3-R (Bel Fuse Inc.) is the primary active equivalent, offering identical electrical characteristics to the obsolete 5HFP 6.3 with ROHS3 compliance and expanded certification coverage (cURus, VDE added). This part maintains the same melting I²t value (70) and represents the direct product line continuation.

021606.3MXEP and 021606.3MXESPP (Littelfuse Inc., Series 216 and 216SP) are functionally equivalent alternatives with ROHS3 compliance and comprehensive international certifications (BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, VDE). These parts differ in physical dimensions within tolerance and melting I²t characteristics but satisfy all core electrical requirements.

0001.1012.PT (SCHURTER Inc., Series SP 5x20) provides an active alternative with ROHS3 compliance and cURus certification. This part exhibits the lowest melting I²t value (36.7) among substitutes, which may affect response characteristics in specific circuit protection scenarios.

BK/GDA-V-6.3A (Eaton - Electronics Division, Series GDA) is an active equivalent with identical electrical specifications but does not meet ROHS3 compliance requirements. This part is suitable only for applications where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can 5HFP 6.3-R directly replace the obsolete 5HFP 6.3?

A: Yes. 5HFP 6.3-R is the active continuation of the 5HFP series with identical current rating (6.3 A), voltage rating (250 V AC), breaking capacity (1.5 kA), and melting I²t (70). Both are manufactured by Bel Fuse Inc. and designed for 5mm x 20mm through-hole mounting. The -R variant includes ROHS3 compliance and expanded certifications.

Q: What is the significance of melting I²t differences among substitutes?

A: Melting I²t is a thermal energy parameter that influences fuse response time under fault conditions. Variations in melting I²t (ranging from 36.7 to 70 across substitutes) may result in different trip times for identical overcurrent events. Circuit designs that depend on precise fuse coordination should account for these differences during validation.

Q: Are all substitutes suitable for RoHS-regulated applications?

A: No. 5HFP 6.3-R, 0001.1012.PT, 021606.3MXEP, and 021606.3MXESPP are ROHS3 compliant. BK/GDA-V-6.3A is RoHS non-compliant and is restricted to applications where RoHS compliance is not required.

Q: Do physical dimension variations affect mechanical compatibility?

A: All substitutes are designed for 5mm x 20mm axial through-hole mounting. Physical dimensions vary within manufacturing tolerances (ranging from 5.20mm to 5.80mm diameter and 20.00mm to 22.50mm length). These variations are within standard PCB footprint tolerances and do not prevent direct mechanical substitution in standard fuse holders.

Q: Which certifications are common across all substitutes?

A: CE, CSA, and PSE certifications are present across most substitutes. CCC and SEMKO certifications are present in multiple parts. Eaton's BK/GDA-V-6.3A includes IMQ certification not present in other substitutes. Littelfuse parts include the broadest certification coverage (BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, VDE).

Q: Is DC cold resistance a critical parameter for substitution?

A: DC cold resistance values range from 0.011 Ω to 0.014 Ω across substitutes. These variations are negligible in typical circuit protection applications and do not disqualify substitution. This parameter is provided for reference in precision circuit analysis only.

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