GMD-800-R Equivalent & Substitute Parts Reference

Part Overview

The GMD-800-R is an 800 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 with CSA and UL approval certifications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and approval agency compliance to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	800 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the GMD-800-R are classified into two categories based on parametric equivalence:

Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts BK/GMD-800-R, BK/GDC-800MA, BK/S506-800-R, BK1/S506-800-R, and S506-800-R share identical electrical ratings (800 mA, 250 V AC), mechanical dimensions (5mm x 20mm), response time classification (slow-blow), and breaking capacity (35A). These parts differ in series designation and internal resistance characteristics but maintain functional interchangeability within the same manufacturer ecosystem.

Cross-Manufacturer Parametric Equivalents: Parts from Littelfuse Inc. (0239.800MXP) and SCHURTER Inc. (0034.3116, 0034.3774, 0034.5042, 0034.5616.11) meet the core substitution criteria: 800 mA current rating, 250 V AC voltage rating, 5mm x 20mm package dimensions, slow-blow response time, and 35A breaking capacity. These parts are interchangeable based on electrical and mechanical parameters, though they may differ in melting I²t values, DC cold resistance, operating temperature ranges, and approval agency certifications.

Substitution Logic: All listed parts maintain the mandatory parameters of 800 mA current rating, 250 V AC voltage rating, 5mm x 20mm physical dimensions, slow-blow response classification, and 35A breaking capacity. Differences in melting I²t, DC cold resistance, and approval certifications do not prevent functional substitution but should be evaluated against specific application requirements and regulatory compliance needs.

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Package (mm)	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies
GMD-800-R	Eaton	800	250	5x20	Slow Blow	35	6.6	0.4475	CSA, UL
BK/GMD-800-R	Eaton	800	250	5x20	Slow Blow	35	6.6	0.4475	CSA, UL
BK/GDC-800MA	Eaton	800	250	5x20	Slow Blow	35	2.78	0.129	cULus, IMQ
BK/S506-800-R	Eaton	800	250	5x20	Slow Blow	35	2.78	0.129	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
BK1/S506-800-R	Eaton	800	250	5x20	Slow Blow	35	2.78	0.129	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
S506-800-R	Eaton	800	250	5x20	Slow Blow	35	2.78	0.129	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
0239.800MXP	Littelfuse	800	250	5x20	Slow Blow	35	7.565	0.4155	CE, CSA, KC, UL
0034.3116	SCHURTER	800	250	5x20	Slow Blow	35	3.85	Not Specified	CCC, cURus, VDE
0034.3774	SCHURTER	800	250	5x20	Slow Blow	35	5.12	Not Specified	cULus
0034.5042	SCHURTER	800	250	5x20	Slow Blow	35	19.6	Not Specified	cURus
0034.5616.11	SCHURTER	800	250	5x20	Slow Blow	35	3.85	Not Specified	cURus, VDE

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility): BK/GMD-800-R and BK/GDC-800MA are direct Eaton equivalents with identical electrical and mechanical specifications to the GMD-800-R. Both parts maintain active production status and carry CSA/UL or cULus/IMQ certifications. BK/GMD-800-R is the closest functional equivalent with matching melting I²t and DC cold resistance values.

Secondary Substitutes (Eaton S506 Series): BK/S506-800-R, BK1/S506-800-R, and S506-800-R provide expanded approval agency coverage including BSI, CCC, SEMKO, and VDE certifications. These parts maintain identical electrical ratings and mechanical dimensions but feature lower melting I²t (2.78 versus 6.6) and reduced DC cold resistance (0.129 versus 0.4475 Ohms). Selection of S506 series parts is appropriate for applications requiring broader international regulatory compliance.

Cross-Manufacturer Alternatives: Littelfuse 0239.800MXP and SCHURTER parts (0034.3116, 0034.3774, 0034.5042, 0034.5616.11) are functionally equivalent based on core electrical and mechanical parameters. Littelfuse 0239.800MXP offers operating temperature range specification (-55°C to 125°C) and CE certification. SCHURTER parts provide varying melting I²t characteristics (3.85 to 19.6) and temperature ranges (-40°C to 85°C or -55°C to 125°C). Selection among cross-manufacturer alternatives depends on specific application temperature requirements and regulatory compliance mandates.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and EAR99 export classification. Applications requiring CSA certification should prioritize GMD-800-R, BK/GMD-800-R, or S506 series parts. Applications requiring UL certification should select GMD-800-R, BK/GMD-800-R, or Littelfuse 0239.800MXP. Applications requiring VDE certification should select S506 series or SCHURTER parts.

Frequently Asked Questions (FAQ)

Q: Can BK/GDC-800MA be used as a direct replacement for GMD-800-R?

A: BK/GDC-800MA is electrically and mechanically equivalent with identical 800 mA, 250 V AC ratings and 5mm x 20mm dimensions. However, it differs in melting I²t (2.78 versus 6.6) and DC cold resistance (0.129 versus 0.4475 Ohms). Substitution is valid for applications where these parameter differences do not affect circuit protection performance. Verify approval agency requirements; BK/GDC-800MA carries cULus and IMQ certifications versus CSA and UL for GMD-800-R.

Q: What is the difference between Eaton S506 series and GMD series fuses?

A: Both series maintain identical electrical ratings (800 mA, 250 V AC), mechanical dimensions (5mm x 20mm), and response time classification (slow-blow). S506 series parts feature lower melting I²t (2.78) and DC cold resistance (0.129 Ohms) compared to GMD series (6.6 and 0.4475 Ohms respectively). S506 series carries broader international certifications (BSI, CCC, SEMKO, VDE) versus GMD series (CSA, UL). Selection depends on application-specific thermal characteristics and regulatory compliance requirements.

Q: Are SCHURTER fuses interchangeable with Eaton GMD-800-R?

A: SCHURTER parts 0034.3116, 0034.3774, 0034.5042, and 0034.5616.11 are parametrically equivalent based on 800 mA current rating, 250 V AC voltage rating, 5mm x 20mm package dimensions, and slow-blow response time. However, they differ significantly in melting I²t values (3.85 to 19.6 versus 6.6 for GMD-800-R) and approval certifications. Substitution is valid for applications where melting I²t variation does not compromise circuit protection. Verify that application regulatory requirements align with SCHURTER certification coverage (cURus, VDE, cULus).

Q: What does melting I²t indicate and why does it vary among equivalent fuses?

A: Melting I²t is the thermal energy required to melt the fuse element, expressed in ampere-squared-seconds. It determines the fuse's response speed to overcurrent conditions. Variations in melting I²t among 800 mA fuses reflect different internal element designs and materials. GMD-800-R (6.6), Littelfuse 0239.800MXP (7.565), and SCHURTER 0034.5042 (19.6) represent different thermal response profiles. Selection should match application requirements for overcurrent detection speed and thermal tolerance.

Q: Can Littelfuse 0239.800MXP replace GMD-800-R in all applications?

A: Littelfuse 0239.800MXP is electrically and mechanically equivalent with matching 800 mA, 250 V AC ratings and 5mm x 20mm dimensions. It provides operating temperature range specification (-55°C to 125°C) and CE certification. Melting I²t (7.565) is comparable to GMD-800-R (6.6). Substitution is valid for applications where CE and CSA/KC certifications satisfy regulatory requirements. Verify that application approval agency mandates do not specifically require CSA or UL certification exclusive to GMD-800-R.

Q: What is the significance of DC cold resistance differences among substitute parts?

A: DC cold resistance affects voltage drop across the fuse during normal circuit operation. GMD-800-R and Littelfuse 0239.800MXP exhibit higher DC cold resistance (0.4475 and 0.4155 Ohms respectively) compared to Eaton S506 series and SCHURTER parts (0.129 Ohms). Lower resistance reduces power dissipation and heat generation. Selection should consider circuit design tolerance for voltage drop and thermal management requirements. Applications with tight voltage regulation specifications may require lower-resistance alternatives.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance status. This ensures compatibility with regulatory requirements for hazardous substance restrictions in electronic equipment. ROHS3 compliance is consistent across GMD-800-R, Eaton S506 series, Littelfuse 0239.800MXP, and SCHURTER parts.

Q: What approval agencies are most relevant for industrial circuit protection applications?

A: CSA, UL, cULus, and VDE are primary approval agencies for industrial circuit protection. GMD-800-R carries CSA and UL certifications. Eaton S506 series carries BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE certifications. Littelfuse 0239.800MXP carries CE, CSA, KC, and UL certifications. SCHURTER parts carry varying combinations of cURus, VDE, and cULus certifications. Selection should align with target market regulatory requirements and equipment certification mandates.

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