Equivalent & Substitute Parts for 5VT 6.3 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5VT 6.3 is a 6.3 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This part is classified as obsolete. Due to its discontinued status, equivalent and substitute parts from active product lines are necessary to maintain system functionality and ensure continued availability for replacement applications.

Substiute Parts

5VT 6.3

Bel Fuse Inc.In Stock: 10995VT 6.3 Datasheet

Current PartRFQ

5ET 6.3-R

Bel Fuse Inc.In Stock: 646795ET 6.3-R Datasheet

Parametric EquivalentRFQ

5ST 6.3-R

Bel Fuse Inc.In Stock: 262425ST 6.3-R Datasheet

Parametric EquivalentRFQ

021806.3HXP

Littelfuse Inc.In Stock: 1610021806.3HXP Datasheet

SimilarRFQ

021806.3MXP

Littelfuse Inc.In Stock: 2780021806.3MXP Datasheet

SimilarRFQ

021806.3TXP

Littelfuse Inc.In Stock: 1002021806.3TXP Datasheet

SimilarRFQ

021806.3VXP

Littelfuse Inc.In Stock: 1044021806.3VXP Datasheet

SimilarRFQ

GDC-6.3A

Eaton - Electronics DivisionIn Stock: 1226GDC-6.3A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5VT 6.3 is determined by strict equivalence across the following parameters:

• Current Rating: 6.3 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these criteria. Parametric equivalents (5ET 6.3-R and 5ST 6.3-R from Bel Fuse Inc.) are direct functional replacements from the same manufacturer. Similar parts (021806.3HXP, 021806.3MXP, 021806.3TXP, 021806.3VXP from Littelfuse Inc., and GDC-6.3A from Eaton) are cross-manufacturer alternatives that satisfy all electrical and mechanical requirements.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 5VT 6.3, the following selection criteria apply:

Bel Fuse Inc. Parametric Equivalents: The 5ET 6.3-R and 5ST 6.3-R are active-status alternatives from the original manufacturer. Both are ROHS3 compliant and carry expanded certification coverage (CCC, CE, CSA, cURus, SEMKO, VDE). The 5ET 6.3-R provides higher breaking capacity (150 A) while maintaining identical melting I²t (658). The 5ST 6.3-R matches the original breaking capacity (63 A) with reduced melting I²t (160).

Littelfuse Inc. Cross-Manufacturer Alternatives: The 021806.3HXP, 021806.3MXP, 021806.3TXP, and 021806.3VXP series are active-status glass cartridge fuses with identical electrical ratings and package dimensions. All are ROHS3 compliant with comprehensive international certifications (CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE). Melting I²t values (198.5) and DC cold resistance (0.0076 Ω) differ from the original specification.

Eaton Electronics Division Alternative: The GDC-6.3A is an active-status substitute with matching electrical and mechanical parameters. Certification coverage is limited to cURus, IMQ, and MITI/JET. Melting I²t (237.6) and DC cold resistance (0.0071 Ω) differ from the original.

Selection should prioritize active-status parts with ROHS3 compliance and certification requirements matching the target application.

Frequently Asked Questions (FAQ)

Q: Can the 5ET 6.3-R replace the 5VT 6.3 directly?

A: Yes. The 5ET 6.3-R is a parametric equivalent with identical current rating (6.3 A), voltage rating (250 V AC), package (5mm x 20mm), response time (slow blow), and mounting type (requires holder). It is active-status and ROHS3 compliant. The higher breaking capacity (150 A vs. 63 A) provides enhanced performance margin.

Q: What is the difference between the 5ST 6.3-R and 5ET 6.3-R?

A: Both are Bel Fuse Inc. parametric equivalents with identical electrical ratings and package. The 5ST 6.3-R has breaking capacity of 63 A and melting I²t of 160, matching the original breaking capacity but with lower thermal energy. The 5ET 6.3-R has breaking capacity of 150 A and melting I²t of 658, providing higher performance margins.

Q: Are Littelfuse 021806.3 series fuses compatible with the 5VT 6.3?

A: Yes. The 021806.3HXP, 021806.3MXP, 021806.3TXP, and 021806.3VXP are similar parts meeting all electrical and mechanical substitution criteria: 6.3 A, 250 V AC, 5mm x 20mm package, slow-blow response, and holder-mount configuration. All are active-status and ROHS3 compliant. Melting I²t values (198.5) differ from the original (658).

Q: Can the GDC-6.3A from Eaton be used as a substitute?

A: Yes. The GDC-6.3A meets all electrical and mechanical requirements: 6.3 A, 250 V AC, 5mm x 20mm package, slow-blow response, and holder-mount configuration. It is active-status. Certification coverage (cURus, IMQ, MITI/JET) is narrower than Bel Fuse or Littelfuse alternatives.

Q: What does "requires holder" mean for mounting?

A: These are cartridge fuses that must be installed in a dedicated fuse holder. They are not panel-mount or inline fuses. The holder provides electrical contact and mechanical retention. Ensure the target application uses a compatible 5mm x 20mm fuse holder.

Q: Why do melting I²t values differ among substitutes?

A: Melting I²t is a thermal characteristic that defines the energy required to melt the fuse element. Variations reflect differences in fuse element design and material composition among manufacturers. All listed substitutes maintain the same current rating and response time classification (slow blow), ensuring functional compatibility within the specified electrical parameters.

Q: Are all substitute parts RoHS compliant?

A: The 5VT 6.3 is RoHS non-compliant. All active-status substitutes (5ET 6.3-R, 5ST 6.3-R, and all Littelfuse 021806.3 variants) are ROHS3 compliant. The GDC-6.3A RoHS status is not specified in available data.