GDB-50MA Equivalent & Substitute Parts Reference

Part Overview

The GDB-50MA is a 50 mA fast-blow glass cartridge fuse rated for 250 V AC/DC operation in a 5mm x 20mm form factor, manufactured by Eaton - Electronics Division. This component requires a compatible fuse holder for installation and is currently in active production status. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional characteristics to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Specification
Current Rating	50 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitute parts for the GDB-50MA are qualified based on the following critical parameters that must match exactly:

Mandatory Matching Parameters:

Current Rating: 50 mA
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Response Time: Fast Blow
Package / Case: 5mm x 20mm
Breaking Capacity @ Rated Voltage: 35A
Mounting Type: Requires Holder

All four identified substitute parts meet these mandatory criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, and operating temperature ranges do not affect functional interchangeability for the primary circuit protection function.

Parameter Comparison

Parameter	GDB-50MA (Eaton)	BK/S500-50-R (Eaton)	0034.1529 (SCHURTER)	0217.050HXP (Littelfuse)	0217.050MXP (Littelfuse)
Current Rating (Amps)	50 mA	50 mA	50 mA	50 mA	50 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A	35A	35A	35A	35A
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
Product Status	Active	Active	Active	Active	Active
Melting I²t	0.0002	0.0002	0.00025	0.00019	0.00019
DC Cold Resistance	17 Ohms	17 Ohms	Not specified	15.2 Ohms	15.2 Ohms

Engineering Selection Recommendations

Primary Selection (Eaton Ecosystem): BK/S500-50-R from Eaton - Electronics Division maintains identical electrical and mechanical specifications to the GDB-50MA with RoHS Compliant status and MSL 1 rating. This part is suitable for direct replacement within existing Eaton-qualified designs.

Secondary Selection (Multi-Certification): 0217.050HXP and 0217.050MXP from Littelfuse Inc. provide broader international certification coverage including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approvals. Both parts are ROHS3 Compliant and REACH Unaffected. These parts are appropriate for applications requiring expanded regulatory compliance documentation.

Tertiary Selection (European Compliance): 0034.1529 from SCHURTER Inc. offers CCC, cURus, and VDE certifications with ROHS3 Compliant status. This part is suitable for European market applications and designs requiring VDE approval.

All substitute parts are in active production status with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can BK/S500-50-R be used as a direct replacement for GDB-50MA? A: Yes. Both parts are manufactured by Eaton - Electronics Division and share identical current rating (50 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (35A). Physical installation in the same fuse holder is confirmed.

Q: What is the difference between the Littelfuse 0217.050HXP and 0217.050MXP models? A: Both parts are functionally equivalent with identical electrical and mechanical specifications. The designation difference reflects internal Littelfuse product line categorization. Both are suitable for the GDB-50MA application.

Q: Are there compliance differences between substitute options? A: Yes. The Littelfuse parts (0217.050HXP and 0217.050MXP) carry broader international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) compared to the Eaton BK/S500-50-R (no certifications listed). The SCHURTER 0034.1529 carries CCC, cURus, and VDE certifications. Select based on your application's regulatory requirements.

Q: Does melting I²t variation affect substitution suitability? A: Melting I²t values range from 0.0002 to 0.00025 across all parts. All values fall within the fast-blow fuse category and do not affect interchangeability for standard 50 mA circuit protection applications.

Q: Can these fuses be used without a holder? A: No. All parts in this group, including the GDB-50MA, are cartridge-type fuses that require a compatible 5mm x 20mm fuse holder for installation and operation.

Q: What inventory levels are available for each substitute? A: GDB-50MA: 20,099 pcs; BK/S500-50-R: 691 pcs; 0034.1529: 689 pcs; 0217.050HXP: 3,075 pcs; 0217.050MXP: 2,300 pcs.

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