Equivalent & Substitute Parts for GMD-1.6-R

Part Overview

The GMD-1.6-R is a 1.6 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 is classified as Active product status. The part requires a dedicated fuse holder for installation and is compliant with ROHS3 standards. Equivalent and substitute parts are necessary to address inventory availability, regional certification requirements, and application-specific performance characteristics such as breaking capacity and melting I²t values.

Key Parameters

Parameter	Value
Current Rating	1.6 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	27
DC Cold Resistance	0.124 Ohms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the GMD-1.6-R is determined by strict equivalence in the following parameters:

Primary Substitution Criteria:

Current Rating: 1.6 A (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)
Mounting Type: Requires Holder (exact match required)

Secondary Performance Parameters:

Breaking Capacity @ Rated Voltage: 35 A to 100 A (acceptable range)
Melting I²t: 2.93 to 87 (acceptable range based on application requirements)
DC Cold Resistance: 0.0336 to 0.124 Ohms (acceptable range)

All substitute parts listed maintain identical electrical and mechanical specifications for the primary criteria. Variations in breaking capacity and melting I²t reflect different series designs and approval agency certifications, which do not prevent functional substitution when application requirements are met.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency	Inventory (Pcs)
GMD-1.6-R	Eaton - Electronics Division	GMD	1.6	250	5mm x 20mm	100	27	0.124	CSA, PSE/JET, UL	1054
BK/GMD-1.6-R	Eaton - Electronics Division	GMD	1.6	250	5mm x 20mm	100	27	0.124	CSA, PSE/JET, UL	1804
BK/GDC-1.6A	Eaton - Electronics Division	GDC	1.6	250	5mm x 20mm	35	21.7	0.0425	cULus, IMQ, MITI/JET	1676
BK/S506-1.6-R	Eaton - Electronics Division	S506	1.6	250	5mm x 20mm	35	21.7	0.0425	BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE	1072
S506-1.6-R	Eaton - Electronics Division	S506	1.6	250	5mm x 20mm	35	21.7	0.0425	BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE	639
023901.6HXP	Littelfuse Inc.	239	1.6	250	5mm x 20mm	100	30.43	0.1205	CE, CSA, KC, PSE, UL	2100
023901.6MXP	Littelfuse Inc.	239	1.6	250	5mm x 20mm	100	30.43	0.1205	CE, CSA, KC, PSE, UL	5626
021801.6MXP	Littelfuse Inc.	218	1.6	250	5mm x 20mm	35	23.35	0.0336	CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE	2622
0034.3119	SCHURTER Inc.	FST 5x20	1.6	250	5mm x 20mm	35	10.5	Not Provided	CCC, cURus, PSE/JET, VDE	8955
0034.3778	SCHURTER Inc.	FSL 5x20	1.6	250	5mm x 20mm	100	2.93	Not Provided	cULus	1764
0034.5045	SCHURTER Inc.	FTT 5x20	1.6	250	5mm x 20mm	35	87	Not Provided	cURus	1025

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Eaton - Electronics Division):

BK/GMD-1.6-R is the direct equivalent to GMD-1.6-R with identical electrical and mechanical specifications. This part carries the same approval agencies (CSA, PSE/JET, UL) and is recommended as the primary substitute when GMD-1.6-R inventory is unavailable. Inventory availability is higher at 1804 pieces.

Parametric Equivalents (Eaton - Electronics Division):

BK/GDC-1.6A, BK/S506-1.6-R, and S506-1.6-R are parametric equivalents with reduced breaking capacity (35 A versus 100 A) and lower melting I²t values. These parts are suitable for applications where the lower breaking capacity meets circuit protection requirements. BK/S506-1.6-R and S506-1.6-R offer expanded approval agency coverage including BSI, CCC, CURUS, SEMKO, and VDE, making them suitable for international applications requiring these certifications.

Direct Manufacturer Equivalents (Littelfuse Inc.):

023901.6HXP and 023901.6MXP are direct equivalents from Littelfuse Inc. with 100 A breaking capacity matching the GMD-1.6-R. Both parts carry CSA and UL approvals. 023901.6MXP has significantly higher inventory (5626 pieces) and is recommended when Littelfuse sourcing is preferred. Operating temperature range is specified as -55°C to 125°C.

Similar Manufacturer Part (Littelfuse Inc.):

021801.6MXP is a similar part with reduced breaking capacity (35 A) and lower melting I²t (23.35). This part offers expanded approval agency coverage including CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE. Operating temperature range is -55°C to 125°C. Inventory is 2622 pieces.

Parametric Equivalents (SCHURTER Inc.):

0034.3119 (FST 5x20 series), 0034.3778 (FSL 5x20 series), and 0034.5045 (FTT 5x20 series) are parametric equivalents from SCHURTER Inc. with varying breaking capacities and melting I²t values. 0034.3119 has the highest inventory (8955 pieces) and is suitable for applications with 35 A breaking capacity requirement. 0034.3778 offers 100 A breaking capacity with cULus approval. 0034.5045 provides 35 A breaking capacity with cURus approval and the highest melting I²t value (87).

Selection Criteria by Application:

For applications requiring 100 A breaking capacity with standard certifications, select from GMD-1.6-R, BK/GMD-1.6-R, 023901.6HXP, 023901.6MXP, or 0034.3778.

For applications requiring 35 A breaking capacity with expanded international certifications, select from BK/GDC-1.6A, BK/S506-1.6-R, S506-1.6-R, 021801.6MXP, 0034.3119, or 0034.5045.

For applications requiring specific operating temperature ranges, note that Littelfuse and SCHURTER parts specify -55°C to 125°C or -40°C to 85°C ranges, while Eaton parts do not specify operating temperature limits.

Frequently Asked Questions (FAQ)

Q: Can BK/GMD-1.6-R be used as a direct replacement for GMD-1.6-R?

A: Yes. BK/GMD-1.6-R is a direct manufacturer equivalent with identical current rating (1.6 A), voltage rating (250 V AC), package (5mm x 20mm), breaking capacity (100 A), melting I²t (27), and approval agencies (CSA, PSE/JET, UL). No circuit modifications are required.

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

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing the fuse holder or creating a hazard. The GMD-1.6-R and its direct equivalents (BK/GMD-1.6-R, 023901.6HXP, 023901.6MXP, 0034.3778) have 100 A breaking capacity. The parametric equivalents (BK/GDC-1.6A, BK/S506-1.6-R, S506-1.6-R, 021801.6MXP, 0034.3119, 0034.5045) have 35 A breaking capacity. Selection depends on the maximum fault current expected in the application circuit.

Q: Are SCHURTER parts compatible with the same fuse holder as GMD-1.6-R?

A: Yes. All substitute parts listed maintain the 5mm x 20mm package specification and require the same holder type. Physical dimensions are identical at 0.205" diameter x 0.787" length.

Q: Which substitute part has the highest inventory availability?

A: SCHURTER 0034.3119 has the highest inventory at 8955 pieces. Littelfuse 023901.6MXP has 5626 pieces. Both are suitable for high-volume procurement.

Q: Can I substitute a 35 A breaking capacity fuse for a 100 A breaking capacity fuse?

A: Substitution is possible only if the application circuit fault current does not exceed 35 A. If the circuit is designed for 100 A breaking capacity, using a 35 A fuse may result in nuisance fuse operation or inadequate fault protection. Verify circuit requirements before substitution.

Q: What approval agencies are required for my application?

A: Approval agency requirements depend on the target market and application. For North American applications, CSA and UL are standard. For European applications, CE, VDE, and SEMKO are common. For Asian markets, PSE/JET (Japan), CCC (China), and K-MARK (Korea) are required. Select a substitute part that includes all required approval agencies for your target market.

Q: What is the difference between melting I²t values?

A: Melting I²t is a measure of the thermal energy required to melt the fuse element. Higher I²t values indicate slower response to overcurrent conditions. GMD-1.6-R has I²t of 27. Substitute parts range from 2.93 (0034.3778) to 87 (0034.5045). Selection depends on circuit protection requirements and tolerance for inrush current during normal operation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. All parts are also REACH unaffected or not applicable, confirming compliance with environmental regulations.

Q: What is the operating temperature range for GMD-1.6-R?

A: Operating temperature is not specified for GMD-1.6-R. Littelfuse parts specify -55°C to 125°C. SCHURTER parts specify -40°C to 85°C or -55°C to 125°C depending on series. If operating temperature range is critical for your application, select a substitute part with specified temperature limits.

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