Littelfuse 023502.5MXP Glass Cartridge Fuse 2.5A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 023502.5MXP is a fast-blow glass cartridge fuse rated 2.5A at 250VAC, housed in a 5mm x 20mm form factor requiring a fuse holder for installation. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (2.5A), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), physical package (5mm x 20mm), and mounting requirement (holder-based installation). Variations in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications do not disqualify parts from substitution provided all primary electrical and mechanical parameters remain identical. Parts are grouped by manufacturer and series designation.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
023502.5MXP	Littelfuse Inc.	235	2.5	250	Fast Blow	5x20mm	100	5.445	0.0437	Active
023502.5HXP	Littelfuse Inc.	235	2.5	250	Fast Blow	5x20mm	100	5.445	0.0437	Active
021702.5HXP	Littelfuse Inc.	217	2.5	250	Fast Blow	5x20mm	35	9.46	0.0334	Active
021702.5MXP	Littelfuse Inc.	217	2.5	250	Fast Blow	5x20mm	35	9.46	0.0334	Active
061702.5MXP	Littelfuse Inc.	617	2.5	250	Fast Blow	5x20mm	35	9.46	0.0334	Active
5MF 2.5-R	Bel Fuse Inc.	5MF	2.5	250	Fast Blow	5x20mm	200	7.6	0.037	Active
5SF 2.5-R	Bel Fuse Inc.	5SF	2.5	250	Fast Blow	5x20mm	35	10	0.026	Active
BK/GDB-2.5A	Eaton - Electronics Division	GDB	2.5	250	Fast Blow	5x20mm	35	6.1	0.034	Active
BK/GMA-2.5-R	Eaton - Electronics Division	GMA	2.5	250	Fast Blow	5x20mm	100	4.9	0.046	Active
BK/S500-2.5-R	Eaton - Electronics Division	S500	2.5	250	Fast Blow	5x20mm	35	6.1	0.034	Active
BK1/GMA-2.5-R	Eaton - Electronics Division	GMA	2.5	250	Fast Blow	5x20mm	100	4.9	0.046	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and meet the core electrical and mechanical requirements of the 023502.5MXP. Selection among substitutes should be based on certification requirements specific to the application. The Littelfuse 235 series (023502.5MXP and 023502.5HXP) carry CE, CSA, KC, PSE, and UL approvals. The Littelfuse 217 and 617 series expand certification coverage to include BSI, CCC, and VDE. Bel Fuse 5MF 2.5-R provides the highest breaking capacity at 200A with CE, CSA, cULus, and PSE certifications. Eaton GMA and S500 series parts offer broad international certification including CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE. Component selection should align with the specific regulatory and safety certifications required by the end application and regional market.

Frequently Asked Questions (FAQ)

Q: Can 023502.5HXP directly replace 023502.5MXP? A: Yes. Both parts are Littelfuse Series 235 glass cartridge fuses with identical electrical ratings (2.5A, 250VAC), response time (fast blow), and physical dimensions (5x20mm). Both require a fuse holder and operate across -55°C to 125°C. Inventory availability differs, with 023502.5HXP offering higher stock levels.

Q: What is the difference between Littelfuse Series 235, 217, and 617? A: All three series meet the 2.5A, 250VAC, 5x20mm specifications. Series 235 (023502.5MXP/HXP) provides 100A breaking capacity. Series 217 (021702.5HXP/MXP) and 617 (061702.5MXP) reduce breaking capacity to 35A and differ in approval agency certifications. Series 217 and 617 include additional international certifications (BSI, CCC, VDE) beyond the Series 235 baseline.

Q: Are Bel Fuse and Eaton parts compatible with Littelfuse fuse holders? A: All substitute parts maintain the 5mm x 20mm physical package and require holder-based installation identical to the 023502.5MXP. Physical compatibility with existing fuse holders is assured by dimensional equivalence. Electrical performance differences (breaking capacity, melting I²t, DC resistance) do not affect mechanical fit.

Q: Which substitute offers the highest breaking capacity? A: Bel Fuse 5MF 2.5-R provides 200A breaking capacity, compared to 100A for Littelfuse Series 235 and Eaton GMA series, and 35A for Littelfuse Series 217/617, Bel Fuse 5SF, Eaton GDB, and Eaton S500.

Q: What certifications are common across all substitutes? A: CE and CSA certifications are present across all listed parts. UL or cULus certification is available in all substitutes. Additional certifications vary by manufacturer and series, with Eaton S500 and Littelfuse 217 offering the broadest international approval coverage including CCC, VDE, SEMKO, and IMQ.

Q: Does operating temperature range differ among substitutes? A: All parts specify -55°C to 125°C operating temperature range, with the exception of Eaton parts (GDB, GMA, S500, BK1/GMA) where operating temperature is not specified in the provided data. Littelfuse and Bel Fuse parts maintain the full -55°C to 125°C range.

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