GMD-4-R Equivalent & Substitute Parts Reference

Part Overview

The GMD-4-R is a 4 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm package format manufactured by Eaton - Electronics Division. This fuse requires a holder for installation and is designed for general-purpose circuit protection applications. The part maintains Active product status with 911 pieces in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	4 A
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	200 A
Melting I²t	300
DC Cold Resistance	0.048 Ohms
RoHS Status	ROHS3 Compliant
Approval Agencies	PSE/Jet, UL

Substitute Part Grouping Explanation

Substitute parts for GMD-4-R are classified into two categories based on electrical and mechanical parameter alignment:

Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts BK/GMD-4-R, BK/GDC-4A, BK/S506-4-R, and GDC-4A are manufactured by Eaton and share identical current rating (4 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and package dimensions (5mm x 20mm). These parts are mechanically and electrically interchangeable with GMD-4-R. Variations exist in breaking capacity, melting I²t values, and approval certifications, which determine suitability for specific application requirements.

Parametric Equivalents (Multi-Manufacturer): Parts from Littelfuse Inc. (0239004.MXP, 0239004.HXP) and SCHURTER Inc. (0034.3123, 0034.5049, 0034.5623.11, 0213004.MXP) match the core substitution criteria: 4 A current rating, cartridge glass fuse type, slow-blow response, and 5mm x 20mm package format. The Littelfuse parts operate at 125 V AC, which differs from the 250 V AC rating of GMD-4-R and requires application-specific voltage compatibility verification. SCHURTER parts maintain 250 V AC rating and are fully compatible with GMD-4-R electrical specifications.

Substitution Logic: All substitute parts maintain identical current rating (4 A), fuse type (cartridge glass), response time (slow blow), and mechanical package (5mm x 20mm). Voltage rating, breaking capacity, melting I²t, and approval certifications are the primary differentiators. Parts with matching 250 V AC voltage rating and equivalent or higher breaking capacity are direct substitutes. Parts with lower voltage ratings (125 V AC) are suitable only for applications operating within their voltage specification.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Fuse Type	Response	Package	Breaking Capacity (A)	Melting I²t	Approval Agencies
GMD-4-R	Eaton	4	250	Cartridge, Glass	Slow Blow	5x20mm	200	300	PSE/Jet, UL
BK/GMD-4-R	Eaton	4	250	Cartridge, Glass	Slow Blow	5x20mm	200	300	PSE/Jet, UL
BK/GDC-4A	Eaton	4	250	Cartridge, Glass	Slow Blow	5x20mm	40	71.8	cULus, IMQ, MITI/JET
BK/S506-4-R	Eaton	4	250	Cartridge, Glass	Slow Blow	5x20mm	40	71.8	BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE
GDC-4A	Eaton	4	250	Cartridge, Glass	Slow Blow	5x20mm	40	71.8	cURus, IMQ, MITI/JET
0239004.MXP	Littelfuse	4	125	Cartridge, Glass	Slow Blow	5x20mm	10000	270.703	CE, CSA, KC, PSE, UL
0239004.HXP	Littelfuse	4	125	Cartridge, Glass	Slow Blow	5x20mm	10000	270.703	CE, CSA, KC, PSE, UL
0034.3123	SCHURTER	4	250	Cartridge, Glass	Slow Blow	5x20mm	40	68.3	CCC, cURus, PSE/JET, VDE
0034.5049	SCHURTER	4	250	Cartridge, Glass	Slow Blow	5x20mm	35	410	cURus
0034.5623.11	SCHURTER	4	250	Cartridge, Glass	Slow Blow	5x20mm	40	68.3	cURus, VDE
0213004.MXP	Littelfuse	4	250	Cartridge, Glass	Slow Blow	5x20mm	40	226.505	BSI, CCC, CE, CSA, PSE, SEMKO, UR, VDE

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Specifications): BK/GMD-4-R is the direct equivalent to GMD-4-R, manufactured by the same supplier (Eaton) with identical electrical ratings, breaking capacity, and melting I²t characteristics. This part is recommended when maintaining exact specification compliance is required.

For 250 V AC Applications with Reduced Breaking Capacity: BK/GDC-4A, BK/S506-4-R, GDC-4A, 0034.3123, 0034.5049, 0034.5623.11, and 0213004.MXP are suitable substitutes for applications where breaking capacity of 35-40 A is acceptable. These parts maintain 250 V AC voltage rating and 4 A current rating. BK/S506-4-R and 0213004.MXP offer the broadest approval certifications (BSI, CCC, CE, CSA, PSE, SEMKO, VDE), making them suitable for international applications. SCHURTER parts (0034.3123, 0034.5623.11) provide PSE/JET and VDE certifications, supporting Asian and European market requirements.

For 125 V AC Applications: 0239004.MXP and 0239004.HXP are suitable only for circuits operating at 125 V AC or lower. These Littelfuse parts provide 10 kA breaking capacity and broad certifications (CE, CSA, KC, PSE, UL). These parts must not be used in 250 V AC circuits.

Inventory Availability Consideration: SCHURTER 0034.3123 maintains the highest inventory level (58,155 pieces), followed by Littelfuse 0239004.HXP (6,788 pieces), providing supply chain flexibility for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can BK/GDC-4A replace GMD-4-R in all applications? A: BK/GDC-4A matches the 4 A current rating, 250 V AC voltage rating, cartridge glass fuse type, slow-blow response, and 5mm x 20mm package of GMD-4-R. However, breaking capacity differs: GMD-4-R provides 200 A while BK/GDC-4A provides 40 A. This substitution is suitable for applications where 40 A breaking capacity is sufficient. Applications requiring 200 A breaking capacity must use GMD-4-R or BK/GMD-4-R.

Q: Are Littelfuse 0239004.MXP and 0239004.HXP interchangeable with GMD-4-R? A: These Littelfuse parts are not direct substitutes for GMD-4-R. While they share identical current rating (4 A), fuse type (cartridge glass), response time (slow blow), and package dimensions (5mm x 20mm), they operate at 125 V AC instead of 250 V AC. These parts are suitable only for circuits operating at 125 V AC or lower and must not be used in 250 V AC applications.

Q: What is the difference between SCHURTER 0034.3123 and 0034.5623.11? A: Both parts are SCHURTER 4 A, 250 V AC slow-blow glass cartridge fuses in 5mm x 20mm package. They differ in melting I²t (0034.3123: 68.3 vs. 0034.5623.11: 68.3) and approval certifications. 0034.3123 holds CCC, cURus, PSE/JET, and VDE certifications, while 0034.5623.11 holds cURus and VDE certifications. Both are electrically equivalent and mechanically interchangeable.

Q: Does GMD-4-R require a specific holder type? A: GMD-4-R is a cartridge fuse requiring a holder for installation. The 5mm x 20mm package dimension specifies the holder compatibility. Any standard 5mm x 20mm fuse holder is mechanically compatible. All substitute parts listed maintain identical 5mm x 20mm dimensions and are compatible with the same holder types.

Q: Which substitute part offers the broadest international certification coverage? A: 0213004.MXP (Littelfuse) and BK/S506-4-R (Eaton) offer the most comprehensive approval certifications. 0213004.MXP holds BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE certifications. BK/S506-4-R holds BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, and VDE certifications. Both parts are suitable for applications requiring multi-regional compliance.

Q: Can I use 0034.5049 as a substitute if breaking capacity is not a critical parameter? A: 0034.5049 is a SCHURTER 4 A, 250 V AC slow-blow glass cartridge fuse in 5mm x 20mm package with 35 A breaking capacity and 410 melting I²t. It is mechanically and electrically compatible with GMD-4-R for applications where 35 A breaking capacity is acceptable. However, this part holds only cURus certification, limiting its use to applications within cURus compliance scope.

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