GMD-400-R Equivalent & Substitute Parts

Part Overview

The GMD-400-R is a 400 mA, 250 V AC/DC slow blow glass cartridge fuse in a 5mm x 20mm package manufactured by Eaton - Electronics Division. This component is classified as Active product status and requires a fuse holder for installation. Glass cartridge fuses of this specification are used in circuit protection applications where controlled current interruption and thermal response characteristics are critical. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and approval agency certifications.

Key Parameters

Parameter	Value
Current Rating	400 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-400-R are qualified based on the following criteria:

Electrical Parameters (Mandatory Match):

Current Rating: 400 mA
Voltage Rating (AC): 250 V
Response Time: Slow Blow
Breaking Capacity @ Rated Voltage: 35A

Mechanical Parameters (Mandatory Match):

Package / Case: 5mm x 20mm
Fuse Type: Cartridge, Glass
Mounting Type: Requires Holder

Compliance Parameters:

RoHS Status: ROHS3 Compliant
Product Status: Active

All substitute parts listed meet these core requirements. Variations in secondary parameters such as Melting I²t, DC Cold Resistance, and operating temperature ranges do not disqualify substitution when primary electrical and mechanical specifications are identical. Approval agency certifications vary by manufacturer and regional requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (Amps)	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency	Inventory (Pcs)
GMD-400-R	Eaton - Electronics Division	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.2	1.505	CSA, UL	1002
BK/GMD-400-R	Eaton - Electronics Division	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.2	1.505	CSA, UL	1769
BK/S506-400-R	Eaton - Electronics Division	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.872	0.31	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	969
BK1/S506-400-R	Eaton - Electronics Division	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.872	0.31	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	2077
S506-400-R	Eaton - Electronics Division	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.872	0.31	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	686
0239.400MXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.49	1.475	CE, CSA, KC, UL	2059
0034.3113	SCHURTER Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.768	Not Provided	CCC, cURus, VDE	2229
0034.3770	SCHURTER Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.337	Not Provided	cULus	866
0034.5039	SCHURTER Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35A	5.2	Not Provided	cURus	1136
0034.5613.11	SCHURTER Inc.	400 mA	250 V	Slow Blow	5mm x 20mm	35A	0.768	Not Provided	cURus, VDE	1828
0213.400MXP	Littelfuse	400 mA	250 V	Slow Blow	5mm x 20mm	35A	1.36	0.535	BSI, CCC, CE, CSA, SEMKO, UR, VDE	1252

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Eaton - Electronics Division):

BK/GMD-400-R is a direct equivalent to GMD-400-R with identical electrical and mechanical specifications, including Melting I²t of 1.2 and DC Cold Resistance of 1.505 Ohms. Both carry CSA and UL approvals. This part is suitable for direct replacement without circuit redesign.

Parametric Equivalents (Eaton S506 Series):

BK/S506-400-R, BK1/S506-400-R, and S506-400-R are parametric equivalents from Eaton's S506 series. These parts match all mandatory electrical and mechanical parameters. The S506 series carries expanded approval agency certifications including BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE. Melting I²t is 0.872 and DC Cold Resistance is 0.31 Ohms, representing different thermal response characteristics within the slow blow classification.

Cross-Manufacturer Substitutes (Littelfuse):

0239.400MXP and 0213.400MXP from Littelfuse Inc. meet all mandatory electrical and mechanical specifications. Both are ROHS3 compliant and carry CSA and UL approvals. Operating temperature range extends to -55°C to 125°C. Melting I²t values are 1.49 and 1.36 respectively, within acceptable slow blow parameters.

Cross-Manufacturer Substitutes (SCHURTER):

0034.3113, 0034.3770, 0034.5039, and 0034.5613.11 from SCHURTER Inc. meet all mandatory electrical and mechanical specifications. These parts carry regional certifications including cURus and VDE. Melting I²t values range from 0.337 to 5.2, representing variations in thermal response within the slow blow classification. Operating temperature ranges vary by series.

Selection Criteria:

For applications requiring UL certification: GMD-400-R, BK/GMD-400-R, 0239.400MXP, 0213.400MXP
For applications requiring VDE certification: BK/S506-400-R, BK1/S506-400-R, S506-400-R, 0034.3113, 0034.3770, 0034.5039, 0034.5613.11, 0213.400MXP
For applications requiring extended temperature range (-55°C to 125°C): 0239.400MXP, 0213.400MXP, 0034.5613.11
For highest inventory availability: BK1/S506-400-R (2077 Pcs), 0034.3113 (2229 Pcs), 0239.400MXP (2059 Pcs)

Frequently Asked Questions (FAQ)

Q: Can I substitute BK/S506-400-R for GMD-400-R in my circuit?

A: Yes. Both parts share identical current rating (400 mA), voltage rating (250 V AC), response time (Slow Blow), package dimensions (5mm x 20mm), and breaking capacity (35A). The primary difference is the Melting I²t value (0.872 vs 1.2) and DC Cold Resistance (0.31 vs 1.505 Ohms), which represent different thermal response characteristics within the slow blow fuse classification. Both are ROHS3 compliant and carry CSA certification.

Q: What is the difference between Melting I²t values in these substitute parts?

A: Melting I²t is a thermal characteristic that indicates the energy required to melt the fuse element. Lower values indicate faster thermal response, while higher values indicate slower thermal response. All listed substitutes are classified as Slow Blow fuses and meet the 400 mA, 250 V specification. The variation in Melting I²t (ranging from 0.337 to 5.2) reflects different internal fuse element designs across manufacturers and series, but all remain functionally equivalent for the specified electrical parameters.

Q: Are SCHURTER parts (0034.3113, 0034.3770, etc.) direct replacements for Eaton GMD-400-R?

A: Yes, from an electrical and mechanical standpoint. All SCHURTER parts listed match the mandatory specifications: 400 mA current rating, 250 V voltage rating, Slow Blow response time, 5mm x 20mm package, and 35A breaking capacity. However, approval agency certifications differ. SCHURTER parts carry cURus and/or VDE certifications rather than UL. Verify that your application's regulatory requirements accept these certifications before substitution.

Q: Can I use 0034.5039 (Melting I²t 5.2) instead of GMD-400-R (Melting I²t 1.2)?

A: Yes, from a specification matching perspective. Both parts are 400 mA, 250 V, Slow Blow, 5mm x 20mm glass cartridge fuses with 35A breaking capacity. The higher Melting I²t value of 0034.5039 indicates a slower thermal response within the slow blow classification. This substitution is valid if your circuit design accommodates the thermal response characteristics of the FTT 5x20 series.

Q: What is the difference between 0239.400MXP and 0213.400MXP from Littelfuse?

A: Both parts are 400 mA, 250 V, Slow Blow, 5mm x 20mm glass cartridge fuses from Littelfuse. The primary differences are series designation (239 vs 213) and Melting I²t values (1.49 vs 1.36). Both carry CSA and UL approvals, are ROHS3 compliant, and support operating temperatures from -55°C to 125°C. Both are functionally equivalent for the specified electrical parameters.

Q: Do all substitute parts require the same fuse holder as GMD-400-R?

A: Yes. All listed substitute parts are 5mm x 20mm glass cartridge fuses that require a holder for installation. The mechanical package dimensions are identical across all substitutes, ensuring compatibility with standard 5mm x 20mm fuse holders.

Q: Which substitute part has the highest inventory availability?

A: SCHURTER 0034.3113 has the highest inventory with 2229 pieces in stock, followed by Littelfuse 0239.400MXP with 2059 pieces and Eaton BK1/S506-400-R with 2077 pieces.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the GMD-400-R specification.

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