GDG6-3/10 Equivalent & Substitute Parts Reference

Part Overview

The GDG6-3/10 is a midget time-delay glass fuse manufactured by Mersen USA Newburyport-MA L.L.C. This component is classified as a time-delay fuse cartridge designed for circuit protection applications requiring slow-blow response characteristics. The part is currently active in production with ROHS3 compliance certification. Substitute parts are necessary when the original manufacturer part becomes unavailable, when bulk packaging is preferred over box packaging, or when alternative qualified suppliers are required to meet procurement specifications.

Key Parameters

Parameter	GDG6-3/10
Manufacturer	Mersen USA Newburyport-MA L.L.C.
Fuse Type	Midget, Time Delay, Glass
Current Rating	6.3 A
Voltage Rating - AC	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Product Status	Active
RoHS Status	ROHS3 Compliant
Packaging Type	Box

Substitute Part Grouping Explanation

Substitution eligibility for the GDG6-3/10 is determined by the following critical parameters:

Current Rating: 6.3 A (must match exactly)
Voltage Rating - AC: 250 V (must match exactly)
Response Time: Slow Blow (must match exactly)
Package / Case: 5mm x 20mm (must match exactly)
Fuse Type: Cartridge, Glass (must match exactly)
Product Status: Active (substitute must be in active production)
RoHS Status: ROHS3 Compliant (substitute must maintain compliance)

All identified substitute parts are manufactured by Littelfuse Inc., Series 218, and meet the electrical and mechanical specifications required for direct substitution. The primary difference between the main part and substitutes is packaging format (bulk versus box) and minor variations in approval agency certifications.

Parameter Comparison

Parameter	GDG6-3/10	021806.3HXP	021806.3MXBP	021806.3MXF34P	021806.3MXP	021806.3TXP
Manufacturer	Mersen USA	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	6.3 A	6.3 A	6.3 A	6.3 A	6.3 A	6.3 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V
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
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Breaking Capacity @ Rated Voltage	Not Specified	63A	63A	63A	63A	63A
Melting I²t	Not Specified	198.5	198.5	198.5	198.5	198.5
Operating Temperature	Not Specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	Not Specified	0.0076 Ohms	0.0076 Ohms	0.0076 Ohms	0.0076 Ohms	0.0076 Ohms
Product Status	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Box	Bulk	Bulk	Bulk	Bulk	Bulk

Engineering Selection Recommendations

All five substitute parts (021806.3HXP, 021806.3MXBP, 021806.3MXF34P, 021806.3MXP, and 021806.3TXP) are qualified equivalents for the GDG6-3/10 based on matching electrical specifications and mechanical dimensions. Each substitute maintains ROHS3 compliance and active product status.

The Littelfuse 218 Series parts carry comprehensive approval certifications including CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE. Part 021806.3MXF34P includes KC certification in addition to the standard approvals. All substitutes are available in bulk packaging, which may provide cost advantages for high-volume procurement compared to the original box packaging format.

Selection between substitute options should be based on inventory availability, packaging requirements, and specific approval agency certifications required by the application or regional standards.

Frequently Asked Questions (FAQ)

Q: Can the GDG6-3/10 be directly replaced with any of the Littelfuse 021806 series parts?

A: Yes. All five substitute parts (021806.3HXP, 021806.3MXBP, 021806.3MXF34P, 021806.3MXP, and 021806.3TXP) share identical electrical ratings (6.3 A, 250 V AC), response time (Slow Blow), and mechanical dimensions (5mm x 20mm). All are ROHS3 compliant and in active production status.

Q: What is the primary difference between the GDG6-3/10 and its substitutes?

A: The main difference is packaging format. The GDG6-3/10 is supplied in box packaging, while all Littelfuse substitutes are supplied in bulk packaging. Electrical and mechanical specifications are identical.

Q: Are there differences in approval certifications between the substitute parts?

A: Minor variations exist. Most substitutes carry CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE certifications. Part 021806.3MXF34P includes KC certification instead of K-MARK. Part 021806.3TXP includes KC certification in addition to the standard set. Verify that the selected substitute meets all required certifications for your application.

Q: Do all substitutes require a fuse holder?

A: Yes. All substitute parts are cartridge-type fuses that require a holder for installation. The 5mm x 20mm form factor is standard for midget fuse holders.

Q: What is the melting I²t value, and why is it important?

A: The melting I²t value of 198.5 represents the thermal energy required to melt the fuse element. This parameter ensures consistent time-delay response characteristics across all qualified substitutes and is critical for circuit protection coordination.

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