Equivalent & Substitute Parts for GMD-2.5-R

Part Overview

The GMD-2.5-R is a 2.5 A, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for 5mm x 20mm holder applications and requires an external fuse holder for installation. The part is active in production with 812 pieces currently in stock. Alternative equivalent and substitute parts are necessary to support supply chain flexibility, accommodate regional certification requirements, and provide options when primary inventory is unavailable.

Key Parameters

Parameter	Value
Current Rating	2.5 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	100 A
Melting I²t	94
DC Cold Resistance	0.0905 Ohms
RoHS Status	ROHS3 Compliant
Approval Agencies	CSA, PSE/JET, UL

Substitute Part Grouping Explanation

Substitution of the GMD-2.5-R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 2.5 A
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package / Case: 5mm x 20mm
Mounting Type: Requires Holder

Secondary Consideration Parameters:

Breaking Capacity @ Rated Voltage
Melting I²t
DC Cold Resistance
Approval Agency certifications

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical characteristics and breaking capacity (100 A), including BK/GMD-2.5-R from Eaton and 023902.5HXP and 023902.5MXP from Littelfuse.

Parametric Equivalents: Parts meeting all mandatory matching parameters but with reduced breaking capacity (35 A) and different melting I²t values, including Eaton series GDC and S506, and Littelfuse 021802.5HXP.

All substitute parts maintain the same physical dimensions (0.205" Dia x 0.787" L / 5.20mm x 20.00mm) and are ROHS3 compliant.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage (V AC)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies	Inventory (Pcs)
GMD-2.5-R	Eaton	2.5	250	100	94	0.0905	CSA, PSE/JET, UL	812
BK/GMD-2.5-R	Eaton	2.5	250	100	94	0.0905	CSA, PSE/JET, UL	1255
BK/GDC-2.5A	Eaton	2.5	250	35	59.4	0.0255	cULus, IMQ, MITI/JET	1043
BK/S506-2.5-R	Eaton	2.5	250	35	59.4	0.0255	BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE	3012
BK1/S506-2.5-R	Eaton	2.5	250	35	59.4	0.0255	BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE	2678
GDC-2.5A	Eaton	2.5	250	35	59.4	0.0255	cURus, IMQ, MITI/JET	922
S506-2.5-R	Eaton	2.5	250	35	59.4	0.0255	BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE	816
023902.5HXP	Littelfuse	2.5	250	100	79.705	0.0583	CE, CSA, KC, PSE, UL	2200
023902.5MXP	Littelfuse	2.5	250	100	79.705	0.0583	CE, CSA, KC, PSE, UL	3140
021802.5HXP	Littelfuse	2.5	250	35	23.25	0.0219	CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE	21272
0034.3121	SCHURTER Inc.	2.5	250	35	21.9	Not Provided	CCC, cURus, PSE/JET, VDE	2136

Engineering Selection Recommendations

For Direct Replacement with Identical Electrical Performance:

Select BK/GMD-2.5-R when higher inventory availability is required while maintaining identical breaking capacity (100 A) and melting I²t (94). Both parts carry CSA, PSE/JET, and UL certifications. The BK/GMD-2.5-R variant offers 1255 pieces in stock compared to 812 for the base GMD-2.5-R.

Littelfuse 023902.5HXP and 023902.5MXP are direct electrical equivalents with 100 A breaking capacity. These parts carry CE, CSA, KC, PSE, and UL certifications. The 023902.5MXP has the highest inventory availability at 3140 pieces. Operating temperature range is specified as -55°C to 125°C for Littelfuse parts.

For Applications Accepting Reduced Breaking Capacity:

Eaton S506 series (BK/S506-2.5-R, BK1/S506-2.5-R, S506-2.5-R) and GDC series (BK/GDC-2.5A, GDC-2.5A) are parametric equivalents with 35 A breaking capacity. These parts are suitable for applications where the lower breaking capacity is acceptable. The S506 series carries the broadest certification scope: BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, and VDE. BK/S506-2.5-R offers the highest inventory among this group at 3012 pieces.

Littelfuse 021802.5HXP is a parametric equivalent with 35 A breaking capacity and the highest total inventory availability at 21272 pieces. This part carries CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE certifications.

SCHURTER 0034.3121 is a parametric equivalent with 35 A breaking capacity and carries CCC, cURus, PSE/JET, and VDE certifications.

Regional Certification Considerations:

For applications requiring VDE certification, select from Eaton S506 series, Littelfuse 021802.5HXP, or SCHURTER 0034.3121.

For applications requiring CCC certification, select from Eaton S506 series, Littelfuse 021802.5HXP, or SCHURTER 0034.3121.

For applications requiring K-MARK certification, Littelfuse 021802.5HXP is the only option.

Frequently Asked Questions (FAQ)

Q: Can BK/GMD-2.5-R be used as a direct replacement for GMD-2.5-R?

A: Yes. BK/GMD-2.5-R is a direct equivalent with identical electrical parameters: 2.5 A current rating, 250 V AC voltage rating, 100 A breaking capacity, 94 melting I²t, and 0.0905 Ohms DC cold resistance. Both parts carry the same certifications (CSA, PSE/JET, UL) and use the same 5mm x 20mm package.

Q: What is the difference between the 100 A and 35 A breaking capacity options?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing the fuse element or holder. The GMD-2.5-R and its direct equivalents (BK/GMD-2.5-R, Littelfuse 023902.5HXP, 023902.5MXP) have 100 A breaking capacity. Parametric equivalents (Eaton GDC and S506 series, Littelfuse 021802.5HXP, SCHURTER 0034.3121) have 35 A breaking capacity. Selection depends on the maximum fault current expected in the application circuit.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The main part GMD-2.5-R is ROHS3 compliant. Littelfuse 021802.5HXP and SCHURTER 0034.3121 do not specify RoHS status in the provided data but are listed as substitutes in the original part documentation.

Q: What is the significance of melting I²t values?

A: Melting I²t is a thermal characteristic that indicates the energy required to melt the fuse element. Lower melting I²t values indicate faster response to overcurrent conditions. The GMD-2.5-R has a melting I²t of 94. Parametric equivalents have lower values (59.4 for Eaton GDC/S506, 79.705 for Littelfuse 023902.5 series, 23.25 for Littelfuse 021802.5HXP, 21.9 for SCHURTER 0034.3121). Application requirements determine whether a lower melting I²t is acceptable.

Q: Can I use Littelfuse 021802.5HXP in place of GMD-2.5-R?

A: Littelfuse 021802.5HXP is a parametric equivalent, not a direct equivalent. It matches the mandatory parameters (2.5 A, 250 V AC, slow-blow, 5mm x 20mm) but has reduced breaking capacity (35 A versus 100 A) and significantly lower melting I²t (23.25 versus 94). Use this part only if the application circuit has a maximum fault current below 35 A and the faster response time is acceptable or beneficial.

Q: Which substitute part has the best availability?

A: Littelfuse 021802.5HXP has the highest inventory at 21272 pieces. Among direct equivalents with 100 A breaking capacity, Littelfuse 023902.5MXP has 3140 pieces in stock.

Q: Do all parts fit the same 5mm x 20mm holder?

A: Yes. All listed parts have identical physical dimensions (0.205" Dia x 0.787" L / 5.20mm x 20.00mm) and require the same holder type. Physical compatibility is guaranteed across all substitute parts.

Q: What certifications are most important for my application?

A: Certification requirements depend on the end application and target market. UL certification is standard for North American applications. CSA certification is required for Canadian applications. VDE certification is required for European applications. PSE/JET certification is required for Japanese applications. CCC certification is required for Chinese applications. Review your application requirements and select a part with the appropriate certifications from the Approval Agencies column in the Parameter Comparison table.

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