Equivalent & Substitute Parts for GDC-1A

Part Overview

The GDC-1A is a 1 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm package format manufactured by Eaton - Electronics Division. This fuse requires a holder for installation and is designed for general-purpose circuit protection applications. The part maintains active product status with 722 pieces in current inventory. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional equivalence in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	1 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	35 A
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitute parts for the GDC-1A are classified based on strict equivalence of the following critical parameters:

Primary Equivalence Criteria:

Current Rating: 1 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)
Breaking Capacity @ Rated Voltage: 35 A (exact match required)

Secondary Considerations:

Melting I²t values vary across substitute parts but remain within acceptable ranges for the 1 A, 250 V classification
DC Cold Resistance values differ but do not affect functional substitution at rated specifications
Approval agencies vary by manufacturer but all parts maintain active product status
RoHS3 compliance and REACH status are consistent across all substitutes

All listed substitute parts meet the primary equivalence criteria and are suitable for direct replacement in applications requiring GDC-1A functionality.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
GDC-1A	Eaton - Electronics Division	GDC	1	250	5x20mm	Slow Blow	35	6.45	0.0757	722
BK/GDC-1A	Eaton - Electronics Division	GDC	1	250	5x20mm	Slow Blow	35	6.45	0.0757	1455
BK/GMD-1-R	Eaton - Electronics Division	GMD	1	250	5x20mm	Slow Blow	35	12	0.3065	1307
BK/S506-1-R	Eaton - Electronics Division	S506	1	250	5x20mm	Slow Blow	35	6.45	0.0757	1618
GMD-1-R	Eaton - Electronics Division	GMD	1	250	5x20mm	Slow Blow	35	12	0.3065	853
S506-1-R	Eaton - Electronics Division	S506	1	250	5x20mm	Slow Blow	35	6.45	0.0757	781
0213001.MXP	Littelfuse Inc.	213	1	250	5x20mm	Slow Blow	35	19.2	0.1165	10400
0034.3117	SCHURTER Inc.	FST 5x20	1	250	5x20mm	Slow Blow	35	3.3	Not Specified	7410
0034.3117.G	SCHURTER Inc.	FST 5x20	1	250	5x20mm	Slow Blow	35	3.3	Not Specified	3721
0034.3775	SCHURTER Inc.	FSL 5x20	1	250	5x20mm	Slow Blow	35	4.52	Not Specified	1350
0034.5043	SCHURTER Inc.	FTT 5x20	1	250	5x20mm	Slow Blow	35	19.4	Not Specified	972

Engineering Selection Recommendations

Eaton - Electronics Division Substitutes (GDC, GMD, S506 Series):

The BK/GDC-1A, BK/S506-1-R, and S506-1-R parts are direct parametric equivalents to the GDC-1A with identical electrical characteristics and melting I²t values. These parts maintain the same DC cold resistance and are suitable for applications where the original GDC-1A specification is required. The BK/GMD-1-R and GMD-1-R variants feature higher melting I²t values (12 versus 6.45) and increased DC cold resistance (0.3065 versus 0.0757 Ohms), which may affect thermal response characteristics in specific circuit designs.

Littelfuse 0213001.MXP:

This part meets all primary equivalence criteria with 1 A, 250 V, 5x20mm specifications and 35 A breaking capacity. The melting I²t value of 19.2 is higher than the GDC-1A baseline. Operating temperature range is specified as -55°C to 125°C. This part carries extensive international approvals including BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE. Inventory availability is highest among all substitutes at 10,400 pieces.

SCHURTER Inc. Substitutes (FST, FSL, FTT Series):

SCHURTER parts 0034.3117, 0034.3117.G, 0034.3775, and 0034.5043 all meet primary equivalence criteria. Melting I²t values range from 3.3 to 19.4. Operating temperature ranges vary: FST and FSL series operate at -55°C to 125°C and -40°C to 85°C respectively. FTT series operates at -40°C to 85°C. All SCHURTER parts maintain RoHS3 compliance and REACH unaffected status. Approval agencies differ by series: FST and FSL carry CCC, cURus, PSE/JET, and VDE certifications; FTT carries cURus certification.

Selection Basis:

Part selection should be based on: (1) required approval certifications for the target application, (2) operating temperature range requirements, (3) inventory availability, and (4) melting I²t characteristics appropriate to the circuit protection design. All listed parts are active products suitable for direct substitution within the specified electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can all listed substitute parts replace the GDC-1A in any application?

A: All substitute parts match the primary equivalence criteria: 1 A current rating, 250 V AC voltage rating, 5x20mm package, slow-blow response, and 35 A breaking capacity. However, approval certifications and operating temperature ranges differ by manufacturer and series. Verify that the substitute part carries the required certifications for your specific application (UL, CSA, VDE, CCC, etc.) and operates within the specified temperature range.

Q: What is the significance of different melting I²t values among the substitutes?

A: Melting I²t represents the thermal energy required to melt the fuse element. The GDC-1A has a melting I²t of 6.45. Substitutes range from 3.3 (SCHURTER FST series) to 19.4 (SCHURTER FTT series). While all parts are rated for 1 A at 250 V, different I²t values affect the thermal response curve. Parts with lower I²t values respond faster to overcurrent conditions; parts with higher I²t values tolerate longer overcurrent durations. Select based on circuit protection requirements.

Q: Are there differences in DC cold resistance among the substitutes?

A: Yes. The GDC-1A and most Eaton substitutes have DC cold resistance of 0.0757 Ohms. Eaton GMD series parts (BK/GMD-1-R, GMD-1-R) have 0.3065 Ohms. Littelfuse 0213001.MXP has 0.1165 Ohms. SCHURTER parts do not specify DC cold resistance. In low-voltage, high-current applications, higher DC cold resistance may introduce measurable voltage drop across the fuse element.

Q: Which substitute has the best inventory availability?

A: Littelfuse 0213001.MXP has the highest inventory at 10,400 pieces. Among Eaton parts, BK/S506-1-R has 1,618 pieces. Among SCHURTER parts, 0034.3117 has 7,410 pieces. Inventory levels should be verified at time of procurement.

Q: What approval certifications does the GDC-1A carry?

A: The GDC-1A carries cURus, IMQ, and MITI/JET approvals. Substitute parts carry different certification combinations. BK/GDC-1A carries cULus, IMQ, and MITI/JET. BK/S506-1-R carries BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, and VDE. Littelfuse 0213001.MXP carries BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE. SCHURTER parts carry subsets of CCC, cURus, cULus, PSE/JET, and VDE. Select based on required certifications for your target market.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant. The GDC-1A does not specify RoHS status in the provided data. All substitutes carry REACH unaffected status where specified.

Q: What is the operating temperature range for the GDC-1A?

A: The GDC-1A does not specify an operating temperature range in the provided data. Littelfuse 0213001.MXP operates at -55°C to 125°C. SCHURTER FST series operates at -55°C to 125°C. SCHURTER FSL and FTT series operate at -40°C to 85°C. Verify temperature requirements for your application and select accordingly.

Q: Can I use a substitute part with a different melting I²t if the current and voltage ratings match?

A: Matching current and voltage ratings ensures the fuse will not blow under normal operating conditions. However, melting I²t affects the fuse response to overcurrent conditions. A substitute with significantly different I²t may alter circuit protection characteristics. Consult circuit protection design specifications to confirm I²t compatibility.

Q: Are the 5x20mm dimensions identical across all substitute parts?

A: Yes. All substitute parts are specified as 5mm x 20mm (0.205" Dia x 0.787" L). Physical dimensions are identical and compatible with standard 5x20mm fuse holders.

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