GMD-630-R Equivalent & Substitute Parts

Part Overview

The GMD-630-R is a 630 mA, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm package manufactured by Eaton - Electronics Division. This fuse requires a holder for installation and is designed for circuit protection applications requiring slow-blow response characteristics. The part is active in production status. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, fuse type, and response time characteristics to ensure direct functional replacement in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	630 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A

Substitute Part Grouping Explanation

Substitute parts for the GMD-630-R are grouped into two categories based on electrical and mechanical compatibility:

Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts BK/GMD-630-R, BK/GDC-630MA, BK/S506-630-R, BK1/S506-630-R, and S506-630-R share identical current ratings (630 mA), voltage ratings (250 V AC), fuse type (cartridge glass), response time (slow blow), and package dimensions (5mm x 20mm). These parts are interchangeable based on matching all critical electrical and mechanical parameters.

Cross-Manufacturer Equivalents: Parts from Littelfuse Inc. (0218.630HXP, 0218.630MXP, 0218.630TXP) and SCHURTER Inc. (0034.3115, 0034.3772) meet the same electrical specifications (630 mA, 250 V AC, slow blow, 5mm x 20mm package). These parts are functionally equivalent despite differences in melting I²t values and approval agencies, as they satisfy the core substitution criteria of current rating, voltage rating, fuse type, response time, and physical dimensions.

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Package (mm)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Approval Agency
GMD-630-R	Eaton	630	250	Slow Blow	5x20	35	3.1	0.629	CSA, UL
BK/GMD-630-R	Eaton	630	250	Slow Blow	5x20	35	3.1	0.629	CSA, UL
BK/GDC-630MA	Eaton	630	250	Slow Blow	5x20	35	1.33	0.186	cULus, IMQ
BK/S506-630-R	Eaton	630	250	Slow Blow	5x20	35	1.33	0.186	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
BK1/S506-630-R	Eaton	630	250	Slow Blow	5x20	35	1.33	0.186	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
S506-630-R	Eaton	630	250	Slow Blow	5x20	35	1.33	0.186	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
0218.630HXP	Littelfuse	630	250	Slow Blow	5x20	35	4.675	0.275	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0218.630MXP	Littelfuse	630	250	Slow Blow	5x20	35	4.675	0.275	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0218.630TXP	Littelfuse	630	250	Slow Blow	5x20	35	4.675	0.275	CCC, CE, CSA, KC, SEMKO, UL, VDE
0034.3115	SCHURTER	630	250	Slow Blow	5x20	35	4.35	Not Specified	CCC, cURus, VDE
0034.3772	SCHURTER	630	250	Slow Blow	5x20	35	3.62	Not Specified	cULus

Engineering Selection Recommendations

Eaton Direct Equivalents: BK/GMD-630-R is a direct equivalent to GMD-630-R with identical electrical and mechanical specifications. BK/GDC-630MA, BK/S506-630-R, BK1/S506-630-R, and S506-630-R are Eaton alternatives with matching core parameters. The S506 series variants (BK/S506-630-R, BK1/S506-630-R, S506-630-R) provide expanded approval agency coverage including BSI, CCC, cULus, IMQ, SEMKO, and VDE, making them suitable for applications requiring broader international compliance.

Littelfuse Alternatives: The 0218 series (0218.630HXP, 0218.630MXP, 0218.630TXP) from Littelfuse meets all core electrical and mechanical requirements. These parts carry CSA and UL approvals matching the original GMD-630-R, with additional certifications including CE, K-MARK, and SEMKO. Operating temperature range is specified as -55°C to 125°C.

SCHURTER Alternatives: The 0034.3115 (FST 5x20 series) and 0034.3772 (FSL 5x20 series) from SCHURTER meet electrical and mechanical specifications. The 0034.3115 carries cURus and VDE approvals with -55°C to 125°C operating range. The 0034.3772 carries cULus approval with -40°C to 85°C operating range.

Selection should be based on required approval agencies, operating temperature range, and application-specific compliance requirements. All listed parts are active in production status.

Frequently Asked Questions (FAQ)

Q: What makes a part a valid substitute for the GMD-630-R?

A: A substitute part must match the following core parameters: 630 mA current rating, 250 V AC voltage rating, slow-blow response time, cartridge glass fuse type, and 5mm x 20mm physical dimensions. All listed substitute parts meet these criteria.

Q: Are Littelfuse and SCHURTER parts direct replacements for the Eaton GMD-630-R?

A: Yes. Littelfuse (0218 series) and SCHURTER (0034 series) parts are functionally equivalent substitutes. They share identical electrical ratings, response characteristics, and physical dimensions. Differences in melting I²t values and DC cold resistance do not prevent substitution when core electrical and mechanical parameters match.

Q: What is the significance of different melting I²t values among substitute parts?

A: Melting I²t is a thermal characteristic that affects fuse response behavior under specific fault conditions. While substitute parts show variation in this parameter (ranging from 1.33 to 4.675), all parts maintain the same 630 mA current rating and slow-blow response classification. Application requirements determine whether specific I²t values are critical.

Q: Do all substitute parts carry the same approval certifications?

A: No. The original GMD-630-R carries CSA and UL approvals. Substitute parts carry varying approval combinations: Eaton S506 series includes BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE; Littelfuse 0218 series includes CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE; SCHURTER parts include CCC, cURus, VDE, or cULus. Select parts based on required certifications for your application.

Q: Can I use BK/GDC-630MA as a substitute for GMD-630-R?

A: Yes. BK/GDC-630MA is a parametric equivalent from Eaton with matching current rating (630 mA), voltage rating (250 V AC), response time (slow blow), and package dimensions (5mm x 20mm). It carries cULus and IMQ approvals.

Q: What is the difference between the S506 series variants (BK/S506-630-R, BK1/S506-630-R, S506-630-R)?

A: All three S506 variants share identical electrical and mechanical specifications. The primary difference is inventory availability: BK1/S506-630-R has the highest stock level at 10,840 pieces, followed by BK/S506-630-R at 922 pieces, and S506-630-R at 706 pieces. All carry the same approval agencies.

Q: Are there operating temperature differences between substitute parts?

A: Yes. The original GMD-630-R does not specify an operating temperature range. Littelfuse 0218 series specifies -55°C to 125°C. SCHURTER 0034.3115 specifies -55°C to 125°C, while 0034.3772 specifies -40°C to 85°C. Verify operating temperature requirements for your application.

Q: Can I substitute a Littelfuse part for an Eaton part in a design already qualified with Eaton components?

A: Substitution is electrically and mechanically valid based on matching core parameters. However, design qualification and compliance requirements may necessitate re-evaluation if the original design specifies Eaton as the sole approved manufacturer or if specific approval agencies are mandated.

Q: What does "Requires Holder" mean for the GMD-630-R and its substitutes?

A: All listed parts are cartridge fuses that require a separate fuse holder for installation. They are not self-contained units. Ensure your application includes an appropriate 5mm x 20mm fuse holder compatible with the fuse cartridge.

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