Littelfuse 021606.3H Ceramic Fuse 6.3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 021606.3H is a 6.3 A, 250 V AC/DC ceramic cartridge fuse in 5mm x 20mm form factor with fast-blow response characteristics. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct substitution in existing applications.

Key Parameters

Parameter	Specification
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Package / Case	5mm x 20mm
Response Time	Fast Blow
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 (6.3 A), voltage rating (250 V AC), fuse type (ceramic cartridge), package dimensions (5mm x 20mm), response time (fast blow), and breaking capacity (1.5 kA). All identified substitutes maintain these core electrical and mechanical specifications. Littelfuse parametric equivalents (021606.3HXP, 021606.3MXB940P, 021606.3MXBP, 021606.3MXF18P, 021606.3MXP, 021606.3TXP, 021606.3VXP) differ only in packaging configuration and product status (active vs. obsolete). Cross-manufacturer alternatives (Eaton BK/GDA-6.3A, BK/S501-6.3-R; Bel Fuse 5HF 6.3-R) provide functional equivalence with minor variations in melting I²t and DC cold resistance within acceptable engineering tolerances.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Package	Response	Breaking Capacity (kA)	Product Status	RoHS Status
021606.3H	Littelfuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Obsolete	Non-compliant
021606.3HXP	Littelfuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
021606.3MXB940P	Littelfuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
021606.3MXBP	Littelfuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
021606.3MXF18P	Littelfuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
021606.3MXP	Littelfuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
021606.3TXP	Littelfuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
021606.3VXP	Littelfuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
BK/GDA-6.3A	Eaton - Electronics Division	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
5HF 6.3-R	Bel Fuse Inc.	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant
BK/S501-6.3-R	Eaton - Electronics Division	6.3	250	5mm x 20mm	Fast Blow	1.5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production restocking, Littelfuse parametric equivalents (021606.3HXP, 021606.3MXP, 021606.3TXP) are preferred as primary substitutes due to identical manufacturer lineage, active product status, and ROHS3 compliance. These parts maintain full compatibility with existing 021606.3H circuit implementations.

Cross-manufacturer alternatives from Eaton (BK/GDA-6.3A, BK/S501-6.3-R) and Bel Fuse (5HF 6.3-R) provide functionally equivalent performance with active status and regulatory compliance. Selection among these alternatives depends on supply chain availability and existing qualification documentation within the application.

All identified substitutes carry equivalent international approvals (CCC, CE, CSA, SEMKO, VDE) and maintain the 1.5 kA breaking capacity specification required for circuit protection integrity.

Frequently Asked Questions (FAQ)

Q: Can 021606.3HXP directly replace 021606.3H in existing applications?

A: Yes. Both parts share identical electrical ratings (6.3 A, 250 V AC), ceramic cartridge construction, 5mm x 20mm form factor, and fast-blow response. The primary difference is product status (active vs. obsolete) and RoHS compliance level.

Q: What is the difference between Littelfuse parametric equivalents (021606.3MXP, 021606.3TXP, 021606.3VXP)?

A: These parts are electrically and mechanically identical. Designations reflect different packaging configurations and internal manufacturing specifications. All maintain 6.3 A, 250 V, 5mm x 20mm specifications and are suitable for direct substitution.

Q: Are cross-manufacturer alternatives (Eaton, Bel Fuse) compatible with the original 021606.3H circuit design?

A: Yes. BK/GDA-6.3A, BK/S501-6.3-R, and 5HF 6.3-R meet all core electrical and mechanical requirements: 6.3 A current rating, 250 V voltage rating, ceramic cartridge type, 5mm x 20mm package, fast-blow response, and 1.5 kA breaking capacity. These parts are suitable for direct substitution in holder-based fuse applications.

Q: What holder type is required for these 5mm x 20mm ceramic cartridge fuses?

A: All listed parts require a standard 5mm x 20mm fuse holder. Verify holder compatibility with your specific application before substitution.

Q: Does the melting I²t variation between manufacturers affect substitution suitability?

A: Melting I²t values (ranging from 48 to 70 across listed parts) represent thermal energy dissipation characteristics. All listed parts maintain the 6.3 A current rating and fast-blow response classification, confirming functional equivalence for circuit protection applications.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed carry ROHS3 compliance. The original 021606.3H is marked as RoHS non-compliant. Compliance requirements depend on application regulatory jurisdiction and customer specifications.

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