Equivalent & Substitute Parts for BK/GMA-100MA

Part Overview

The BK/GMA-100MA is a 100 mA, 250 V AC/DC fast-blow glass cartridge fuse with 5mm x 20mm dimensions, manufactured by Eaton - Electronics Division. This component is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain circuit protection functionality in applications where the original part is no longer available through standard distribution channels. All substitute parts listed maintain identical electrical ratings and mechanical form factors required for direct replacement in fuse holder assemblies.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution eligibility for the BK/GMA-100MA is determined by strict equivalence across the following parameters:

Critical Substitution Parameters:

Current Rating: 100 mA (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: Fast Blow (exact match required)
Breaking Capacity @ Rated Voltage: 35A (exact match required)

All substitute parts listed meet these criteria. Secondary parameters including melting I²t, DC cold resistance, RoHS compliance status, and approval agencies vary among substitutes but do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Product Status	RoHS Status
BK/GMA-100MA	Eaton	100	250	5x20mm	Fast Blow	35	Obsolete	Non-compliant
BK/GMA-100-R	Eaton	100	250	5x20mm	Fast Blow	35	Active	ROHS3 Compliant
BK/GDB-100MA	Eaton	100	250	5x20mm	Fast Blow	35	Active	RoHS Compliant
BK/S500-100-R	Eaton	100	250	5x20mm	Fast Blow	35	Active	ROHS3 Compliant
BK1/S500-100-R	Eaton	100	250	5x20mm	Fast Blow	35	Active	RoHS Compliant
GDB-100MA	Eaton	100	250	5x20mm	Fast Blow	35	Active	RoHS Compliant
GMA-100-R	Eaton	100	250	5x20mm	Fast Blow	35	Active	ROHS3 Compliant
S500-100-R	Eaton	100	250	5x20mm	Fast Blow	35	Active	ROHS3 Compliant
0235.100HXP	Littelfuse	100	250	5x20mm	Fast Blow	35	Active	ROHS3 Compliant
0235.100MXP	Littelfuse	100	250	5x20mm	Fast Blow	35	Active	ROHS3 Compliant
0235.100VXP	Littelfuse	100	250	5x20mm	Fast Blow	35	Active	ROHS3 Compliant

Engineering Selection Recommendations

Eaton Electronics Division Substitutes (Active Status):

The Eaton GMA series substitutes BK/GMA-100-R and GMA-100-R maintain the same series designation as the obsolete BK/GMA-100MA. Both are active products with ROHS3 compliance and CSA/PSE/UL certifications. BK/GMA-100-R is available in bulk packaging with 1321 units in stock.

The Eaton GDB series (BK/GDB-100MA, GDB-100MA) and S500 series (BK/S500-100-R, BK1/S500-100-R, S500-100-R) provide alternative active substitutes from the same manufacturer. All maintain identical electrical and mechanical specifications. The S500 series variants offer the highest inventory availability, with BK1/S500-100-R providing 1825 units in stock.

Littelfuse Substitutes (Active Status):

The Littelfuse 235 series (0235.100HXP, 0235.100MXP, 0235.100VXP) provides cross-manufacturer equivalents with active product status and ROHS3 compliance. These parts carry CE, CSA, KC, and UL certifications with operating temperature range of -55°C to 125°C. All three variants are in active production with combined inventory exceeding 3300 units.

Compliance Considerations:

The original BK/GMA-100MA is RoHS non-compliant. All listed substitutes are RoHS compliant (either RoHS or ROHS3 designation), supporting modern procurement requirements. Selection should prioritize active-status parts to ensure long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can BK/GMA-100MA be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts maintain identical current rating (100 mA), voltage rating (250 V AC), package dimensions (5mm x 20mm), response time (fast blow), and breaking capacity (35A). Direct mechanical and electrical interchangeability is confirmed for all substitutes within standard fuse holder assemblies.

Q: What is the difference between Eaton GMA, GDB, and S500 series fuses?

A: All three series meet the electrical and mechanical requirements for substitution. The primary differences are melting I²t values and DC cold resistance. GMA series exhibits melting I²t of 0.0001 with 7.84 Ohms DC resistance. GDB and S500 series show melting I²t of 0.003 with 3.8 Ohms DC resistance. These secondary characteristics do not affect functional substitution within the specified 100 mA, 250 V fast-blow application.

Q: Are Littelfuse 235 series fuses compatible with Eaton fuse holders?

A: Yes. Littelfuse 0235.100HXP, 0235.100MXP, and 0235.100VXP maintain the identical 5mm x 20mm cartridge form factor and are designed for standard fuse holder assemblies. Mechanical compatibility is confirmed across manufacturers.

Q: What is the significance of the "-R" designation in part numbers like BK/GMA-100-R?

A: The "-R" suffix indicates bulk packaging format. This designation does not affect electrical or mechanical specifications. Parts with and without the "-R" suffix are functionally equivalent.

Q: Should RoHS compliance status influence substitute selection?

A: RoHS compliance is a regulatory and procurement requirement rather than a functional electrical parameter. The original BK/GMA-100MA is RoHS non-compliant. All listed substitutes are RoHS compliant. For new designs and modern supply chains, RoHS-compliant substitutes are required. For legacy system maintenance, functional equivalence remains the primary criterion.

Q: What is the difference between 0235.100HXP, 0235.100MXP, and 0235.100VXP?

A: All three Littelfuse variants maintain identical electrical ratings (100 mA, 250 V AC, fast blow, 35A breaking capacity) and mechanical dimensions (5mm x 20mm). The letter designations (H, M, V) represent internal series variations that do not affect substitution eligibility. Selection can be based on inventory availability and packaging preferences.

Q: Are there inventory considerations for substitute selection?

A: Inventory levels vary among substitutes. BK1/S500-100-R offers the highest availability at 1825 units. Littelfuse 0235.100MXP provides 1475 units. For applications requiring immediate availability, these options present the strongest supply position.

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