Equivalent & Substitute Parts for BK1/GMA-2-R Glass Cartridge Fuse

Part Overview

The BK1/GMA-2-R is a 2 A, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This fast-blow fuse is designed for applications requiring circuit protection in a 5mm x 20mm form factor with a breaking capacity of 100 A at rated voltage. The part is active in production and widely stocked (1446 pcs available). Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and regulatory compliance standards.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Breaking Capacity @ Rated Voltage	100 A
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (100% Electrical & Mechanical Compatibility): Parts that match all critical parameters: 2 A current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package, 100 A breaking capacity, and glass cartridge construction. These parts are interchangeable without circuit redesign.

Similar Substitutes (Compatible with Parameter Variance): Parts that match core electrical ratings (2 A, 250 V AC, fast-blow, 5mm x 20mm) but differ in breaking capacity (35 A instead of 100 A) or melting I²t characteristics. These parts are suitable for applications where the lower breaking capacity is acceptable.

The substitution logic is based strictly on:

Current Rating (Amps): 2 A
Voltage Rating (AC): 250 V
Response Time: Fast Blow
Package / Case: 5mm x 20mm
Fuse Type: Cartridge, Glass
Mounting Type: Requires Holder

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Approval Agency	Inventory (Pcs)	Classification
BK1/GMA-2-R	Eaton - Electronics Division	2	250	Fast Blow	5mm x 20mm	100	3.1	0.066	CSA, PSE, UL	1446	Main Part
0235002.MXP	Littelfuse Inc.	2	250	Fast Blow	5mm x 20mm	100	2.645	0.0603	CE, CSA, KC, PSE, UL	9994	Direct Substitute
0235002.VXP	Littelfuse Inc.	2	250	Fast Blow	5mm x 20mm	100	2.645	0.0603	CE, CSA, K-MARK, PSE, UL	1048	Direct Substitute
0034.3877	SCHURTER Inc.	2	250	Fast Blow	5mm x 20mm	100	2.93	—	cULus	1840	Direct Substitute
0235002.HXP	Littelfuse Inc.	2	250	Fast Blow	5mm x 20mm	100	2.645	0.0603	CE, CSA, KC, PSE, UL	1478	Similar Substitute
0217002.MXP	Littelfuse Inc.	2	250	Fast Blow	5mm x 20mm	35	5.73	0.0416	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	30200	Similar Substitute
0217002.HXP	Littelfuse Inc.	2	250	Fast Blow	5mm x 20mm	35	5.73	0.0416	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	3823	Similar Substitute
0217002.TXP	Littelfuse Inc.	2	250	Fast Blow	5mm x 20mm	35	5.73	0.0416	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	775	Similar Substitute
0034.1519	SCHURTER Inc.	2	250	Fast Blow	5mm x 20mm	35	5.28	—	CCC, cURus, PSE/JET, VDE	20622	Similar Substitute

Engineering Selection Recommendations

Direct Substitutes (Recommended for Drop-In Replacement):

The following parts are electrically and mechanically equivalent to BK1/GMA-2-R and require no circuit modification:

0235002.MXP (Littelfuse 235 Series): Highest inventory availability (9994 pcs). Meets CE, CSA, KC, PSE, and UL certifications. Melting I²t of 2.645 provides faster response than the main part. Operating temperature range -55°C to 125°C.
0235002.VXP (Littelfuse 235 Series): Identical electrical specifications to 0235002.MXP with K-MARK certification addition. Lower inventory (1048 pcs).
0034.3877 (SCHURTER FSK 5x20 Series): Meets cULus certification. Melting I²t of 2.93 closely matches the main part. Operating temperature range -40°C to 85°C. Inventory of 1840 pcs.

Similar Substitutes (Conditional Use):

The following parts match all electrical and mechanical parameters except breaking capacity (35 A vs. 100 A):

0217002.MXP (Littelfuse 217 Series): Highest inventory among similar substitutes (30200 pcs). Comprehensive certification coverage (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE). Lower DC cold resistance (0.0416 Ω) and higher melting I²t (5.73). Operating temperature -55°C to 125°C. Suitable for applications where 35 A breaking capacity is sufficient.
0217002.HXP and 0217002.TXP (Littelfuse 217 Series): Identical specifications to 0217002.MXP with varying inventory levels (3823 pcs and 775 pcs respectively).
0034.1519 (SCHURTER FSF 5x20 Series): Highest inventory among SCHURTER options (20622 pcs). Certifications include CCC, cURus, PSE/JET, and VDE. Operating temperature -55°C to 125°C. Melting I²t of 5.28.

Selection Criteria:

Use direct substitutes when the circuit design specifies 100 A breaking capacity.
Use similar substitutes only when application analysis confirms that 35 A breaking capacity is acceptable.
Verify regulatory compliance requirements match the target application region.
Consider inventory availability and lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 0217002.MXP as a direct replacement for BK1/GMA-2-R?

A: 0217002.MXP is electrically compatible (2 A, 250 V AC, fast-blow, 5mm x 20mm) but has a lower breaking capacity of 35 A compared to the main part's 100 A. Use this part only if your circuit design analysis confirms that 35 A breaking capacity is adequate for the application.

Q: What is the difference between direct and similar substitutes?

A: Direct substitutes (0235002.MXP, 0235002.VXP, 0034.3877) match all electrical and mechanical parameters including the 100 A breaking capacity. Similar substitutes (0217002 series, 0034.1519) have a reduced breaking capacity of 35 A but maintain the same current rating, voltage rating, response time, and package dimensions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the main part's environmental compliance status.

Q: Which substitute has the best inventory availability?

A: 0217002.MXP (Littelfuse 217 Series) has the highest inventory at 30200 pcs. Among direct substitutes, 0235002.MXP offers the best availability at 9994 pcs.

Q: Do the substitute parts have different operating temperature ranges?

A: Yes. The main part (BK1/GMA-2-R) does not specify an operating temperature range. Direct substitutes 0235002.MXP and 0235002.VXP operate from -55°C to 125°C. SCHURTER 0034.3877 operates from -40°C to 85°C. Similar substitutes from Littelfuse 217 series and SCHURTER 0034.1519 operate from -55°C to 125°C. Verify temperature requirements for your application.

Q: What is the significance of melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values (like 2.645 in Littelfuse 235 series) indicate faster response to overcurrent. Higher values (like 5.73 in Littelfuse 217 series) indicate slower response. The main part has a melting I²t of 3.1. Direct substitutes have comparable or slightly lower values, ensuring similar protection characteristics.

Q: Can I mix different substitute parts in the same circuit?

A: All parts listed are designed for the same 5mm x 20mm holder and have identical current and voltage ratings. However, for circuit consistency and predictable behavior, use the same part number throughout a design unless application analysis specifically allows for variation.

Q: Which certifications should I prioritize for my application?

A: Select parts based on your target market and regulatory requirements. UL and CSA certifications are standard for North American applications. CE marking is required for European markets. PSE certification is required for Japanese markets. Littelfuse 235 series (0235002.MXP, 0235002.VXP) and 217 series offer comprehensive multi-region certification coverage.

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