Littelfuse 032602.5H Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 032602.5H is a 2.5 A, 250 V AC ceramic cartridge fuse in the 326 series, designed for 3AB and 3AG holder applications with 1/4" x 1-1/4" dimensions. This part is classified as obsolete. Substitute parts are necessary to maintain circuit protection functionality in applications where the original part is no longer available. Active alternatives from Littelfuse and other manufacturers provide equivalent or enhanced electrical characteristics while maintaining mechanical compatibility with standard fuse holders.

Key Parameters

Parameter	032602.5H
Current Rating	2.5 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	136
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
DC Cold Resistance	0.083 Ohms
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (mechanical compatibility required)
Fuse Type: Cartridge, Ceramic or Glass (both acceptable for this application)
Response Time: Slow Blow (exact match required)

Substitute parts are grouped into two categories:

Category 1: Littelfuse Ceramic Cartridge Fuses (Active Status) Parts 032602.5HXP, 032602.5MXCCP, 032602.5MXP, and 032602.5VXP are direct parametric equivalents with enhanced DC voltage ratings (125 V DC) and improved compliance certifications. These parts maintain identical AC voltage and current ratings while offering RoHS3 compliance and extended operating temperature ranges.

Category 2: Alternative Manufacturers Part BK/MDA-2-1/2-R and MDA-2-1/2-R from Eaton Electronics Division are ceramic cartridge fuses meeting the same current, voltage, and mechanical specifications. These parts feature higher breaking capacity (200 A) and lower melting I²t values (7.2).

Category 3: Glass Cartridge Fuse Part 0001.2528 from SCHURTER Inc. is a glass cartridge fuse with identical current and AC voltage ratings. This part differs in fuse material (glass vs. ceramic), DC voltage rating (63 V), and melting I²t (18), but maintains mechanical compatibility and slow-blow response characteristics.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Fuse Type	Breaking Capacity	Melting I²t	Product Status	RoHS Status
032602.5H	Littelfuse Inc.	2.5	250	—	Ceramic	100 A	136	Obsolete	Non-compliant
032602.5HXP	Littelfuse Inc.	2.5	250	125	Ceramic	100 A AC, 10 kA DC	136	Active	ROHS3 Compliant
032602.5MXCCP	Littelfuse Inc.	2.5	250	125	Ceramic	100 A AC, 10 kA DC	136	Active	ROHS3 Compliant
032602.5MXP	Littelfuse Inc.	2.5	250	125	Ceramic	100 A AC, 10 kA DC	136	Active	ROHS3 Compliant
032602.5VXP	Littelfuse Inc.	2.5	250	125	Ceramic	100 A AC, 10 kA DC	136	Active	ROHS3 Compliant
BK/MDA-2-1/2-R	Eaton - Electronics Division	2.5	250	—	Ceramic	200 A	7.2	Active	ROHS3 Compliant
MDA-2-1/2-R	Eaton - Electronics Division	2.5	250	—	Ceramic	200 A	7.2	Active	ROHS3 Compliant
0001.2528	SCHURTER Inc.	2.5	250	63	Glass	1.5 kA AC, 20 kA DC	18	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Littelfuse 326 Series - Active Status)

Parts 032602.5HXP, 032602.5MXCCP, 032602.5MXP, and 032602.5VXP are the preferred substitutes. These parts maintain identical current and AC voltage ratings, preserve the melting I²t characteristic (136), and offer active product status with RoHS3 compliance. All four parts are certified by CE, CSA, UL, and PSE, with extended operating temperature ranges (-55°C to 125°C). The addition of 125 V DC rating provides enhanced circuit protection capability for mixed AC/DC applications.

Secondary Substitutes (Eaton MDA Series - Active Status)

Parts BK/MDA-2-1/2-R and MDA-2-1/2-R from Eaton Electronics Division are active alternatives with identical current and AC voltage ratings. These parts feature higher breaking capacity (200 A) and lower melting I²t (7.2), indicating faster response to overcurrent conditions. Certification includes CE, CSA, and UL. These parts are suitable for applications where faster fuse response is acceptable.

Alternative Material (SCHURTER Glass Cartridge - Active Status)

Part 0001.2528 is a glass cartridge fuse with identical current and AC voltage ratings. The glass construction differs from the ceramic material of the original part. This substitute features lower melting I²t (18) and higher breaking capacity (1.5 kA AC, 20 kA DC). Selection of this part requires confirmation that glass fuse characteristics are compatible with the application circuit design.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 032602.5H?

A: All listed substitute parts maintain the same current rating (2.5 A), AC voltage rating (250 V), and mechanical package (3AB, 3AG, 1/4" x 1-1/4"). They are mechanically compatible with standard fuse holders. However, differences in melting I²t and breaking capacity affect response characteristics. Verify that the substitute part's electrical characteristics are appropriate for your specific circuit protection requirements.

Q: What is the difference between ceramic and glass fuse types?

A: Ceramic fuses (032602.5H, 032602.5HXP, 032602.5MXCCP, 032602.5MXP, 032602.5VXP, BK/MDA-2-1/2-R, MDA-2-1/2-R) and glass fuses (0001.2528) differ in construction material and electrical characteristics. Glass fuses typically have lower melting I²t values and different breaking capacities. Material selection depends on application-specific circuit protection requirements.

Q: Why do the Littelfuse active parts have DC voltage ratings when the original 032602.5H does not?

A: The Littelfuse active substitutes (032602.5HXP, 032602.5MXCCP, 032602.5MXP, 032602.5VXP) include 125 V DC ratings, indicating certification for both AC and DC applications. The original 032602.5H does not specify a DC rating. This enhancement provides broader application compatibility without affecting AC performance.

Q: What does melting I²t indicate?

A: Melting I²t is a measure of the fuse's thermal energy absorption capacity before melting. Lower values indicate faster response to overcurrent. The original part has melting I²t of 136, while Eaton MDA series parts have 7.2, and SCHURTER glass fuses have 18. Selection depends on the required response speed for your circuit protection application.

Q: Are all substitute parts RoHS compliant?

A: The original 032602.5H is RoHS non-compliant. All active substitute parts listed (Littelfuse 326 series, Eaton MDA series, and SCHURTER 0001.2528) are ROHS3 compliant, meeting current environmental standards.

Q: What certifications should I verify for my application?

A: The original 032602.5H carries CSA and UL certifications. Littelfuse active substitutes include CE, CSA, K-MARK, PSE, and UL certifications. Eaton MDA series parts include CE, CSA, and UL. SCHURTER 0001.2528 carries cURus certification. Confirm that the substitute part's certification portfolio meets your application and regional requirements.

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