GDC-1.6A Equivalent & Substitute Parts

Part Overview

The GDC-1.6A is a 1.6 A, 250 V AC/DC slow blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 5mm x 20mm holder applications and is currently in active production status. Substitute parts are identified when equivalent electrical and mechanical parameters are required for circuit protection applications where the original part number is unavailable or when alternative manufacturer options are needed for supply chain continuity.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitute parts for the GDC-1.6A are grouped based on strict equivalence of the following critical parameters:

Primary Equivalence Criteria:

Current Rating: 1.6 A
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Package / Case: 5mm x 20mm
Response Time: Slow Blow
Mounting Type: Requires Holder

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in secondary parameters such as Breaking Capacity, Melting I²t, DC Cold Resistance, and approval agencies are noted but do not disqualify a part from substitution eligibility when primary parameters are identical.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status
GDC-1.6A	Eaton - Electronics Division	GDC	1.6	250	5mm x 20mm	Slow Blow	35	21.7	0.0425	Active
BK/GDC-1.6A	Eaton - Electronics Division	GDC	1.6	250	5mm x 20mm	Slow Blow	35	21.7	0.0425	Active
BK/GMD-1.6-R	Eaton - Electronics Division	GMD	1.6	250	5mm x 20mm	Slow Blow	100	27	0.124	Active
BK/S506-1.6-R	Eaton - Electronics Division	S506	1.6	250	5mm x 20mm	Slow Blow	35	21.7	0.0425	Active
GMD-1.6-R	Eaton - Electronics Division	GMD	1.6	250	5mm x 20mm	Slow Blow	100	27	0.124	Active
S506-1.6-R	Eaton - Electronics Division	S506	1.6	250	5mm x 20mm	Slow Blow	35	21.7	0.0425	Active
021301.6MXP	Littelfuse Inc.	213	1.6	250	5mm x 20mm	Slow Blow	35	44.2	0.0551	Active
0034.3119	SCHURTER Inc.	FST 5x20	1.6	250	5mm x 20mm	Slow Blow	35	10.5	Not Provided	Active
0034.3778	SCHURTER Inc.	FSL 5x20	1.6	250	5mm x 20mm	Slow Blow	100	2.93	Not Provided	Active
0034.5045	SCHURTER Inc.	FTT 5x20	1.6	250	5mm x 20mm	Slow Blow	35	87	Not Provided	Active
0034.5619.11	SCHURTER Inc.	SMD-FST	1.6	250	5mm x 20mm	Slow Blow	35	10.5	Not Provided	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and are manufactured by established component suppliers. Selection among equivalent parts should be based on the following factors:

Eaton - Electronics Division Parts (GDC, GMD, S506 Series): BK/GDC-1.6A, BK/GMD-1.6-R, BK/S506-1.6-R, GMD-1.6-R, and S506-1.6-R are direct Eaton alternatives with identical or enhanced electrical characteristics. These parts carry compliance certifications including cULus, CSA, UL, BSI, CCC, IMQ, PSE/JET, SEMKO, and VDE. The GMD series variants (BK/GMD-1.6-R and GMD-1.6-R) feature higher breaking capacity (100 A versus 35 A) and increased melting I²t values.

Littelfuse Inc. 021301.6MXP: This part maintains identical current, voltage, and package specifications with active product status. It carries comprehensive compliance certifications including BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE. Operating temperature range is specified as -55°C to 125°C. Melting I²t is 44.2, which differs from the GDC-1.6A value of 21.7.

SCHURTER Inc. Parts (FST, FSL, FTT, SMD-FST Series): SCHURTER alternatives include 0034.3119, 0034.3778, 0034.5045, and 0034.5619.11. All maintain the required 1.6 A, 250 V, 5mm x 20mm specifications. These parts carry compliance certifications from cULus, cURus, CCC, PSE/JET, and VDE. Operating temperature ranges vary between -40°C to 85°C and -55°C to 125°C. Melting I²t values range from 2.93 to 87, indicating different thermal response characteristics within the slow blow category.

All substitute parts are RoHS3 compliant and REACH unaffected. Selection should account for specific application requirements regarding breaking capacity, thermal response characteristics, and required compliance certifications.

Frequently Asked Questions (FAQ)

Q: What are the core parameters that determine if a part can substitute for the GDC-1.6A?

A: The following parameters must match exactly: 1.6 A current rating, 250 V AC voltage rating, cartridge glass fuse type, 5mm x 20mm package dimensions, slow blow response time, and holder-based mounting type. All listed substitute parts meet these criteria.

Q: Can I use a substitute part with a different breaking capacity?

A: Breaking capacity is a secondary parameter that does not prevent substitution when primary electrical and mechanical specifications are identical. However, application-specific requirements may necessitate consideration of breaking capacity values. The GDC-1.6A has a 35 A breaking capacity, while GMD and FSL variants offer 100 A breaking capacity.

Q: Are all substitute parts physically compatible with the same holder?

A: Yes. All substitute parts maintain the identical 5mm x 20mm package dimension (0.205" Dia x 0.787" L), ensuring mechanical compatibility with standard 5mm x 20mm fuse holders.

Q: What is the significance of melting I²t values in the parameter comparison?

A: Melting I²t represents the thermal energy required to melt the fuse element and is a characteristic of the specific fuse design. While all listed parts are classified as slow blow, melting I²t values vary across manufacturers and series. This parameter does not affect substitution eligibility but may influence thermal response behavior in specific circuit applications.

Q: Which substitute parts have the widest operating temperature range?

A: Littelfuse 021301.6MXP, SCHURTER 0034.3119, and SCHURTER 0034.5619.11 all specify an operating temperature range of -55°C to 125°C, providing the widest temperature tolerance among the listed alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance status and are REACH unaffected, meeting current environmental and regulatory requirements.

Q: What compliance certifications should I verify for my specific application?

A: The GDC-1.6A carries cURus, IMQ, and MITI/JET certifications. Substitute parts carry varying certification combinations including cULus, CSA, UL, BSI, CCC, CE, PSE, SEMKO, UR, VDE, and CCC. Verify that the selected substitute part carries the specific certifications required by your application or regional standards.

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