GDC-100MA Equivalent & Substitute Parts Reference

Part Overview

The GDC-100MA is a 100 mA, 250 V AC/DC slow blow glass cartridge fuse in 5mm x 20mm package format manufactured by Eaton - Electronics Division. This component is classified as Active product status and requires a fuse holder for installation. Glass cartridge fuses of this specification are widely used in industrial control circuits, power distribution equipment, and consumer electronics requiring overcurrent protection. 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	Criticality for Substitution
Current Rating	100 mA	Critical - Must Match Exactly
Voltage Rating (AC)	250 V	Critical - Must Match or Exceed
Fuse Type	Cartridge, Glass	Critical - Determines Holder Compatibility
Package / Case	5mm x 20mm	Critical - Physical Fit Requirement
Response Time	Slow Blow	Critical - Circuit Protection Characteristic
Breaking Capacity @ Rated Voltage	35 A minimum	Important - Safety Rating
Mounting Type	Requires Holder	Critical - Installation Method
DC Cold Resistance	2.8 Ohms (reference)	Secondary - Performance Variation
Melting I²t	0.045 (reference)	Secondary - Thermal Characteristic

Substitute Part Grouping Explanation

Substitute parts for GDC-100MA are grouped into three categories based on electrical and mechanical equivalence:

Category 1: Direct Eaton GDC Series Equivalents These parts maintain identical electrical specifications and are manufactured by the same supplier (Eaton - Electronics Division). Substitution is based on matching current rating (100 mA), voltage rating (250 V AC), response time (Slow Blow), and package dimensions (5mm x 20mm). Parts in this category: BK/GDC-100MA.

Category 2: Eaton S506 Series Equivalents These parts are manufactured by Eaton - Electronics Division under the S506 series designation. They match all critical parameters: 100 mA current rating, 250 V AC voltage rating, Slow Blow response, 5mm x 20mm package, and 35 A breaking capacity. Parts in this category: BK/S506-100-R, BK1/S506-100-R, S506-100-R.

Category 3: Cross-Manufacturer Equivalents These parts are manufactured by SCHURTER Inc. and Littelfuse Inc. and meet all critical electrical and mechanical parameters. Substitution is valid based on: 100 mA current rating, 250 V AC voltage rating, Slow Blow response, 5mm x 20mm package dimensions, 35 A or higher breaking capacity, and appropriate approval certifications. Parts in this category: 0034.3107, 0034.5607.11, 0218.100HXP, 0218.100MXP, 0218.100TXP, 0219.100MXAP.

Critical Substitution Parameters:

Current Rating: 100 mA (exact match required)
Voltage Rating: 250 V AC minimum (exact match)
Response Time: Slow Blow (exact match)
Package: 5mm x 20mm (exact match)
Fuse Type: Cartridge, Glass (exact match)
Breaking Capacity: 35 A minimum

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
GDC-100MA	Eaton	GDC	100	250	Slow Blow	5x20mm	35	0.045	2.8	Active
BK/GDC-100MA	Eaton	GDC	100	250	Slow Blow	5x20mm	35	0.045	2.8	Active
BK/S506-100-R	Eaton	S506	100	250	Slow Blow	5x20mm	35	0.045	2.8	Active
BK1/S506-100-R	Eaton	S506	100	250	Slow Blow	5x20mm	35	0.045	2.8	Active
S506-100-R	Eaton	S506	100	250	Slow Blow	5x20mm	35	0.045	2.8	Active
0034.3107	SCHURTER	FST 5x20	100	250	Slow Blow	5x20mm	35	0.107	—	Active
0034.5607.11	SCHURTER	SMD-FST	100	250	Slow Blow	5x20mm	35	0.107	—	Active
0218.100HXP	Littelfuse	218	100	250	Slow Blow	5x20mm	35	0.0482	8.905	Active
0218.100MXP	Littelfuse	218	100	250	Slow Blow	5x20mm	35	0.0482	8.905	Active
0218.100TXP	Littelfuse	218	100	250	Slow Blow	5x20mm	35	0.079	6.018	Active
0219.100MXAP	Littelfuse	219XA	100	250	Slow Blow	5x20mm	150	0.079	6.018	Active

Engineering Selection Recommendations

Eaton GDC and S506 Series Selection All Eaton-manufactured substitutes (BK/GDC-100MA, BK/S506-100-R, BK1/S506-100-R, S506-100-R) are direct functional equivalents to GDC-100MA. These parts carry identical electrical ratings, mechanical dimensions, and response characteristics. Selection among these Eaton variants is based on availability and approval certifications. All Eaton S506 variants carry expanded international certifications (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE) compared to the base GDC series, providing broader geographic compliance coverage.

SCHURTER FST Series Selection SCHURTER parts 0034.3107 and 0034.5607.11 meet all critical substitution parameters with identical current, voltage, package, and response time specifications. These parts feature extended operating temperature range (-55°C to 125°C) and higher melting I²t values (0.107 versus 0.045). SCHURTER parts carry CCC, cURus, and VDE certifications. Selection of SCHURTER equivalents is appropriate when extended temperature performance or specific regional certifications are required.

Littelfuse 218 and 219XA Series Selection Littelfuse parts 0218.100HXP, 0218.100MXP, 0218.100TXP, and 0219.100MXAP meet all critical electrical and mechanical parameters. Littelfuse 218 series parts (0218.100HXP, 0218.100MXP, 0218.100TXP) carry comprehensive international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) and extended operating temperature range (-55°C to 125°C). The 0219.100MXAP variant offers higher breaking capacity (150 A versus 35 A), providing enhanced safety margin in high-fault-current applications. DC cold resistance values vary among Littelfuse variants (6.018 to 8.905 Ohms), reflecting different internal construction but maintaining functional equivalence for circuit protection.

Compliance and Certification Considerations All substitute parts maintain Active product status. Selection should account for required regional certifications: UL/cULus for North America, CE for European Union, CCC for China, and VDE for European industrial applications. Littelfuse and SCHURTER parts provide broader certification coverage than base Eaton GDC series, supporting global deployment scenarios.

Frequently Asked Questions (FAQ)

Q: Can GDC-100MA be directly replaced with BK/GDC-100MA? A: Yes. BK/GDC-100MA is a direct equivalent manufactured by Eaton - Electronics Division with identical electrical specifications (100 mA, 250 V AC), response time (Slow Blow), package dimensions (5mm x 20mm), and breaking capacity (35 A). Both parts require the same fuse holder and provide equivalent circuit protection.

Q: What is the difference between Eaton S506 variants (BK/S506-100-R, BK1/S506-100-R, S506-100-R)? A: All three S506 variants are electrically and mechanically identical to GDC-100MA. The designations reflect different packaging or distribution channels. Selection among these variants is based on availability and regional certification requirements. All S506 variants carry expanded international certifications (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE).

Q: Are SCHURTER and Littelfuse fuses compatible with the same holder as GDC-100MA? A: Yes. SCHURTER (0034.3107, 0034.5607.11) and Littelfuse (0218.100HXP, 0218.100MXP, 0218.100TXP, 0219.100MXAP) parts share identical 5mm x 20mm package dimensions and cartridge glass construction, ensuring mechanical compatibility with standard 5x20mm fuse holders designed for GDC-100MA.

Q: Why do Littelfuse parts show different DC cold resistance values? A: DC cold resistance variation (6.018 to 8.905 Ohms) reflects different internal element construction among Littelfuse 218 and 219XA series variants. These differences do not affect circuit protection function or substitution validity, as all parts maintain identical current rating (100 mA), voltage rating (250 V AC), and response time (Slow Blow).

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. Variations among substitutes (0.045 to 0.107) reflect different internal construction but do not affect substitution validity when all other critical parameters match. All listed substitutes maintain the same current rating and response time, ensuring equivalent circuit protection performance.

Q: Can 0219.100MXAP be used instead of GDC-100MA despite its higher breaking capacity (150 A)? A: Yes. The 0219.100MXAP is a valid substitute with identical current rating (100 mA), voltage rating (250 V AC), response time (Slow Blow), and package dimensions (5mm x 20mm). The higher breaking capacity (150 A versus 35 A) provides additional safety margin and does not compromise circuit protection function. This part is suitable for applications requiring enhanced fault-current handling capability.

Q: Which substitute part offers the broadest international certification coverage? A: Littelfuse 0218.100HXP and 0218.100MXP carry the most comprehensive certification portfolio: CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. These certifications support deployment across North America (UL), European Union (CE, VDE), China (CCC), and other regulated markets.

Q: Are there operating temperature differences between GDC-100MA and its substitutes? A: GDC-100MA does not specify an operating temperature range. SCHURTER (0034.3107, 0034.5607.11) and Littelfuse (0218.100HXP, 0218.100MXP, 0218.100TXP, 0219.100MXAP) parts specify -55°C to 125°C operating range. When extended temperature performance is required, SCHURTER or Littelfuse substitutes are recommended.

Q: What inventory availability should be considered when selecting a substitute? A: Current inventory levels are: GDC-100MA (921 pcs), BK/GDC-100MA (1929 pcs), S506-100-R (729 pcs), BK1/S506-100-R (1501 pcs), 0034.3107 (4715 pcs), 0218.100MXP (10490 pcs), 0219.100MXAP (3061 pcs). Littelfuse 0218.100MXP offers the highest stock level for immediate availability requirements.

Q: Is RoHS3 compliance a factor in substitute selection? A: All substitute parts listed carry RoHS3 Compliant status, matching the compliance profile of GDC-100MA. This ensures environmental and regulatory equivalence across all substitutes for applications requiring RoHS certification.

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