GMD-250-R Equivalent & Substitute Parts Reference

Part Overview

The GMD-250-R is a 250 mA, 250 V AC/DC slow blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for applications requiring overcurrent protection in a 5mm x 20mm form factor and operates with a breaking capacity of 35A at rated voltage. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same fuse category, package dimensions, and approval certifications.

Key Parameters

Parameter	Value
Current Rating	250 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 GMD-250-R are classified based on strict equivalence of electrical and mechanical parameters. All substitute parts maintain the following critical specifications:

Current Rating: 250 mA
Voltage Rating: 250 V AC
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package Dimensions: 5mm x 20mm
Breaking Capacity: 35A at rated voltage
Mounting Type: Requires Holder

Substitution is valid when these parameters are identical. Secondary parameters such as melting I²t, DC cold resistance, and operating temperature range may vary within acceptable engineering tolerances for the fuse category. Approval agencies and certifications are documented to support application-specific compliance requirements.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Approval Agencies	Operating Temperature
GMD-250-R	Eaton	GMD	250	250	Slow Blow	5x20mm	35	0.4	3.455	CSA, UL	Not specified
BK/GMD-250-R	Eaton	GMD	250	250	Slow Blow	5x20mm	35	0.4	3.455	CSA, UL	Not specified
BK/GDC-250MA	Eaton	GDC	250	250	Slow Blow	5x20mm	35	0.265	0.64	cULus, IMQ	Not specified
BK/S506-250-R	Eaton	S506	250	250	Slow Blow	5x20mm	35	0.265	0.64	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	Not specified
S506-250-R	Eaton	S506	250	250	Slow Blow	5x20mm	35	0.265	0.64	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	Not specified
0239.250MXP	Littelfuse	239	250	250	Slow Blow	5x20mm	35	0.34	3.07	CE, CSA, KC, UL	-55°C ~ 125°C
0218.250TXP	Littelfuse	218	250	250	Slow Blow	5x20mm	35	0.5405	1.0495	CCC, CE, CSA, KC, SEMKO, UL, VDE	-55°C ~ 125°C
0034.3111	SCHURTER	FST 5x20	250	250	Slow Blow	5x20mm	35	0.238	Not specified	CCC, cURus, VDE	-55°C ~ 125°C
0034.5037	SCHURTER	FTT 5x20	250	250	Slow Blow	5x20mm	35	2.53	Not specified	cURus	-40°C ~ 85°C
0034.5611.11	SCHURTER	SMD-FST	250	250	Slow Blow	5x20mm	35	0.238	Not specified	cURus, VDE	-55°C ~ 125°C
0218.250HXP	Littelfuse	218	250	250	Slow Blow	5x20mm	35	0.5405	1.0495	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	-55°C ~ 125°C

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Eaton - Electronics Division)

BK/GMD-250-R is a direct equivalent to GMD-250-R with identical electrical and mechanical specifications. Both parts carry CSA and UL certifications and are suitable for direct substitution in applications where Eaton GMD series fuses are specified.

Parametric Equivalents (Eaton Series)

BK/GDC-250MA, BK/S506-250-R, and S506-250-R maintain all critical electrical and mechanical parameters. These parts differ in melting I²t and DC cold resistance characteristics. BK/S506-250-R and S506-250-R carry expanded certification coverage including BSI, CCC, IMQ, SEMKO, UR, and VDE, supporting broader international application requirements.

Littelfuse Alternatives

0239.250MXP, 0218.250TXP, and 0218.250HXP are parametric equivalents from Littelfuse Inc. All three maintain 250 mA, 250 V, slow blow characteristics in 5x20mm packages with 35A breaking capacity. Operating temperature range is specified as -55°C to 125°C. Certifications include CE, CSA, UL, and regional marks (KC, K-MARK, SEMKO, VDE, CCC). Melting I²t and DC cold resistance values differ from the GMD-250-R baseline.

SCHURTER Alternatives

0034.3111, 0034.5037, and 0034.5611.11 are parametric equivalents from SCHURTER Inc. All maintain core electrical and mechanical specifications. Operating temperature ranges vary: 0034.3111 and 0034.5611.11 support -55°C to 125°C; 0034.5037 supports -40°C to 85°C. Certifications include cURus, VDE, and CCC. Melting I²t values show greater variation in this group.

Selection Basis

Selection among equivalent parts should be based on:

Required approval certifications for the target application
Operating temperature range compatibility
Availability and inventory status
Melting I²t and DC cold resistance tolerance requirements specific to the circuit design

All listed parts are Active status and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can GMD-250-R be replaced with BK/GMD-250-R?

A: Yes. BK/GMD-250-R is a direct manufacturer equivalent with identical specifications, certifications, and performance characteristics. Both are manufactured by Eaton - Electronics Division and carry CSA and UL approvals.

Q: What is the difference between GMD-250-R and BK/GDC-250MA?

A: Both parts maintain identical current rating (250 mA), voltage rating (250 V AC), response time (slow blow), package dimensions (5x20mm), and breaking capacity (35A). The GDC series differs in melting I²t (0.265 vs. 0.4) and DC cold resistance (0.64 vs. 3.455 Ohms). GDC carries cULus and IMQ certifications versus CSA and UL for GMD.

Q: Are Littelfuse 0218.250TXP and 0218.250HXP interchangeable?

A: Both Littelfuse parts are from the 218 series with identical electrical and mechanical parameters. They share the same melting I²t (0.5405) and DC cold resistance (1.0495 Ohms). The primary difference is certification coverage: 0218.250HXP includes K-MARK certification in addition to the certifications held by 0218.250TXP.

Q: What is the operating temperature range for GMD-250-R?

A: The operating temperature range is not specified in the provided data for GMD-250-R. Littelfuse and SCHURTER alternatives specify -55°C to 125°C (except SCHURTER 0034.5037, which specifies -40°C to 85°C).

Q: Can SCHURTER 0034.5037 be used in applications requiring -55°C operation?

A: No. SCHURTER 0034.5037 specifies an operating temperature range of -40°C to 85°C, which does not support -55°C operation. Alternative SCHURTER parts 0034.3111 and 0034.5611.11 support -55°C to 125°C.

Q: What certifications does BK/S506-250-R carry?

A: BK/S506-250-R carries BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE certifications, providing broad international compliance coverage.

Q: How do melting I²t values affect fuse selection?

A: Melting I²t is a thermal characteristic that determines fuse response time under specific overcurrent conditions. GMD-250-R has a melting I²t of 0.4. Equivalent parts range from 0.238 (SCHURTER FST and SMD-FST series) to 2.53 (SCHURTER FTT series). Selection should be based on circuit-specific thermal requirements and coordination with other protective devices.

Q: Are all listed substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant.

Q: What is the package requirement for all these fuses?

A: All fuses require a holder. The physical package is 5mm x 20mm (0.205" diameter x 0.787" length). The fuse cannot be used without an appropriate 5x20mm fuse holder.

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