GDC-250MA Equivalent & Substitute Parts Reference

Part Overview

The GDC-250MA is a 250 mA, 250 V AC/DC slow blow glass cartridge fuse in 5mm x 20mm package format manufactured by Eaton - Electronics Division. This component requires a fuse holder for installation and is classified as Active product status. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same package specification, enabling direct functional replacement in circuit protection applications.

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
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for GDC-250MA is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

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

All substitute parts listed maintain these seven core parameters. Secondary parameters including melting I²t, DC cold resistance, approval agencies, and operating temperature ranges are provided for engineering evaluation but do not disqualify substitution when primary criteria are met.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (Amps)	Voltage Rating - AC (V)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency	Operating Temperature	RoHS Status
GDC-250MA	Eaton - Electronics Division	GDC	0.250	250	Slow Blow	5mm x 20mm	35	0.265	0.64	cURus, IMQ	Not specified	Not specified
BK/GDC-250MA	Eaton - Electronics Division	GDC	0.250	250	Slow Blow	5mm x 20mm	35	0.265	0.64	cULus, IMQ	Not specified	ROHS3 Compliant
BK/GMD-250-R	Eaton - Electronics Division	GMD	0.250	250	Slow Blow	5mm x 20mm	35	0.4	3.455	CSA, UL	Not specified	ROHS3 Compliant
BK/S506-250-R	Eaton - Electronics Division	S506	0.250	250	Slow Blow	5mm x 20mm	35	0.265	0.64	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	Not specified	ROHS3 Compliant
S506-250-R	Eaton - Electronics Division	S506	0.250	250	Slow Blow	5mm x 20mm	35	0.265	0.64	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	Not specified	ROHS3 Compliant
0034.3111	SCHURTER Inc.	FST 5x20	0.250	250	Slow Blow	5mm x 20mm	35	0.238	Not specified	CCC, cURus, VDE	-55°C ~ 125°C	ROHS3 Compliant
0034.5037	SCHURTER Inc.	FTT 5x20	0.250	250	Slow Blow	5mm x 20mm	35	2.53	Not specified	cURus	-40°C ~ 85°C	ROHS3 Compliant
0034.5611.11	SCHURTER Inc.	SMD-FST	0.250	250	Slow Blow	5mm x 20mm	35	0.238	Not specified	cURus, VDE	-55°C ~ 125°C	ROHS3 Compliant
0218.250HXP	Littelfuse Inc.	218	0.250	250	Slow Blow	5mm x 20mm	35	0.5405	1.0495	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	-55°C ~ 125°C	ROHS3 Compliant
0218.250MXP	Littelfuse Inc.	218	0.250	250	Slow Blow	5mm x 20mm	35	0.5405	1.0495	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	-55°C ~ 125°C	ROHS3 Compliant
0218.250TXP	Littelfuse Inc.	218	0.250	250	Slow Blow	5mm x 20mm	35	0.5405	1.0495	CCC, CE, CSA, KC, SEMKO, UL, VDE	-55°C ~ 125°C	ROHS3 Compliant

Engineering Selection Recommendations

Eaton GDC Series (Same Manufacturer): BK/GDC-250MA maintains identical electrical and mechanical specifications to GDC-250MA with added ROHS3 compliance documentation. This represents the direct equivalent within the same product line.

Eaton GMD Series: BK/GMD-250-R meets all primary substitution criteria. Secondary parameter differences include elevated melting I²t (0.4 vs. 0.265) and DC cold resistance (3.455 vs. 0.64 Ohms). Approval agencies differ (CSA, UL vs. cURus, IMQ). Selection depends on circuit design tolerance for these secondary characteristics.

Eaton S506 Series: BK/S506-250-R and S506-250-R both maintain identical primary and secondary electrical parameters to GDC-250MA with expanded approval agency coverage (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE). Both carry ROHS3 compliance.

SCHURTER FST/FTT/SMD-FST Series: 0034.3111, 0034.5037, and 0034.5611.11 meet all primary criteria. Melting I²t values vary (0.238 to 2.53). Operating temperature ranges are specified (-55°C ~ 125°C or -40°C ~ 85°C). All carry ROHS3 compliance. Selection based on application temperature requirements and melting I²t tolerance.

Littelfuse 218 Series: 0218.250HXP, 0218.250MXP, and 0218.250TXP meet all primary criteria with identical melting I²t (0.5405) and DC cold resistance (1.0495 Ohms). All specify operating temperature range -55°C ~ 125°C and carry comprehensive approval agency coverage including UL, CSA, VDE, and CCC. All ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can GDC-250MA be replaced with any of the listed substitute parts?

A: Yes. All listed parts maintain the seven critical primary parameters: 250 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, glass cartridge type, slow blow response, 35A breaking capacity, and holder-mount requirement. Functional substitution is supported across all listed alternatives.

Q: What is the significance of melting I²t differences between substitute parts?

A: Melting I²t is a secondary parameter that characterizes thermal energy absorption before fuse element melting. GDC-250MA specifies 0.265. Substitutes range from 0.238 to 2.53. Circuit designs with specific I²t tolerance requirements must verify compatibility with the selected substitute. Differences do not disqualify substitution when primary parameters match.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry ROHS3 Compliant status. The original GDC-250MA does not specify RoHS status in provided documentation.

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

A: UL, CSA, and VDE certifications are standard for North American and European industrial markets. Littelfuse 218 series parts (0218.250HXP, 0218.250MXP, 0218.250TXP) carry all three. Eaton S506 series parts carry CSA, UL, and VDE. SCHURTER parts carry cURus and VDE. Selection depends on target market regulatory requirements.

Q: Can operating temperature range affect substitution decisions?

A: Operating temperature is a secondary parameter. GDC-250MA does not specify operating temperature range. Littelfuse and SCHURTER parts specify -55°C ~ 125°C or -40°C ~ 85°C ranges. Applications requiring operation outside standard temperature ranges should select parts with matching or broader temperature specifications.

Q: Is DC cold resistance a critical substitution parameter?

A: DC cold resistance is a secondary parameter. GDC-250MA specifies 0.64 Ohms. Substitutes range from 0.64 to 3.455 Ohms. Circuits with specific resistance-dependent characteristics must verify compatibility. Most general-purpose applications tolerate this variation.

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

A: Both series maintain identical primary electrical parameters and melting I²t (0.265). S506 series carries expanded approval agency coverage (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE vs. cURus, IMQ for GDC). Both are Active status products. Selection depends on required certifications.

Q: Are Littelfuse 218 series parts interchangeable with each other?

A: Yes. 0218.250HXP, 0218.250MXP, and 0218.250TXP maintain identical electrical specifications, melting I²t (0.5405), DC cold resistance (1.0495 Ohms), operating temperature (-55°C ~ 125°C), and ROHS3 compliance. Approval agency coverage differs slightly (0218.250TXP includes KC certification). All three are functionally equivalent.

Q: Does package dimension tolerance affect substitution?

A: All substitute parts specify identical package dimensions: 0.205" Dia x 0.787" L (5.20mm x 20.00mm). Physical compatibility with existing fuse holders is maintained across all substitutes.

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