Littelfuse 19411250001 Ceramic Fuse 1.25A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 19411250001 is a 1.25A 250VAC ceramic cartridge fuse in 5x20mm form factor, designed for fast-blow protection in AC/DC circuits. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse requires a holder for installation and is certified for multiple international standards including cURus, SEMKO, and VDE.

Key Parameters

Parameter	Value
Current Rating	1.25 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Package / Case	5mm x 20mm
Response Time	Fast Blow
Breaking Capacity @ Rated Voltage	1.5kA
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution for the Littelfuse 19411250001 is determined by strict equivalence across the following parameters:

Current Rating: 1.25 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Fast Blow (exact match required)
Breaking Capacity @ Rated Voltage: 1.5kA (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these criteria. Differences in melting I²t values, DC cold resistance, operating temperature ranges, and approval agencies are noted but do not prevent functional substitution when the above parameters are identical.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating AC (V)	Package / Case	Response Time	Breaking Capacity (kA)	Melting I²t	Product Status
19411250001	Littelfuse Inc.	1.25	250	5mm x 20mm	Fast Blow	1.5	0.7	Obsolete
02161.25HXP	Littelfuse Inc.	1.25	250	5mm x 20mm	Fast Blow	1.5	0.48	Active
02161.25MXP	Littelfuse Inc.	1.25	250	5mm x 20mm	Fast Blow	1.5	0.48	Active
02161.25MXBP	Littelfuse Inc.	1.25	250	5mm x 20mm	Fast Blow	1.5	0.48	Active
02161.25TXP	Littelfuse Inc.	1.25	250	5mm x 20mm	Fast Blow	1.5	0.48	Active
02161.25VXP	Littelfuse Inc.	1.25	250	5mm x 20mm	Fast Blow	1.5	0.48	Active
0001.1005	SCHURTER Inc.	1.25	250	5mm x 20mm	Fast Blow	1.5	0.538	Active
BK/GDA-1.25A	Eaton - Electronics Division	1.25	250	5mm x 20mm	Fast Blow	1.5	0.313	Active
BK/S501-1.25-R	Eaton - Electronics Division	1.25	250	5mm x 20mm	Fast Blow	1.5	0.313	Active
BK1/S501-1.25-R	Eaton - Electronics Division	1.25	250	5mm x 20mm	Fast Blow	1.5	0.313	Active
FCD-1.25A	OptiFuse	1.25	250	5mm x 20mm	Fast Blow	1.5	0.4489	Active

Engineering Selection Recommendations

All listed substitute parts meet the core electrical and mechanical parameters required for direct replacement of the Littelfuse 19411250001. Selection should be based on the following factors:

Littelfuse Series 216 Parts (02161.25HXP, 02161.25MXP, 02161.25MXBP, 02161.25TXP, 02161.25VXP): These are active Littelfuse products from the same manufacturer as the obsolete part. They provide the most direct substitution path with expanded approval certifications including CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE. Operating temperature range is -55°C to 125°C.

SCHURTER 0001.1005: An active ceramic fuse from the SP 5x20 series with certifications from CCC, cURus, KC, and VDE. Operating temperature range is -55°C to 125°C. Melting I²t of 0.538 is closer to the original part's 0.7 value.

Eaton GDA and S501 Series (BK/GDA-1.25A, BK/S501-1.25-R, BK1/S501-1.25-R): Active Eaton products with certifications from CCC, SEMKO, UL, and cULus. These parts have lower melting I²t values (0.313) and do not specify operating temperature ranges in the provided data.

OptiFuse FCD-1.25A: An active ceramic fuse certified to IEC 60127 with operating temperature range of -55°C to 125°C. This part includes 250V DC voltage rating in addition to AC rating. Melting I²t is 0.4489.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the Littelfuse 19411250001?

A: Yes. All listed parts meet the mandatory electrical and mechanical parameters: 1.25A current rating, 250V AC voltage rating, 5x20mm package, fast-blow response, 1.5kA breaking capacity, and cartridge ceramic type requiring a holder. Physical dimensions and mounting requirements are identical.

Q: What is the significance of different melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. The original part has a melting I²t of 0.7, while substitutes range from 0.313 to 0.538. Lower values result in faster response to overcurrent conditions. Selection should consider the specific circuit protection requirements of your application.

Q: Why is the original part obsolete?

A: The Littelfuse 19411250001 is classified as obsolete. The active Littelfuse Series 216 parts (02161.25HXP, 02161.25MXP, 02161.25MXBP, 02161.25TXP, 02161.25VXP) represent the current product line for this specification.

Q: Do all substitute parts have the same approval certifications?

A: No. Approval certifications vary by manufacturer and part number. Littelfuse Series 216 parts include CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE. SCHURTER 0001.1005 includes CCC, cURus, KC, and VDE. Eaton parts include CCC, SEMKO, UL, and cULus. OptiFuse FCD-1.25A is certified to IEC 60127. Verify that the selected part meets the certification requirements of your target market or application.

Q: What is the operating temperature range for these fuses?

A: Littelfuse Series 216, SCHURTER 0001.1005, and OptiFuse FCD-1.25A all specify -55°C to 125°C operating temperature range. Eaton parts do not specify operating temperature in the provided data.

Q: Are these fuses RoHS compliant?

A: Yes. All listed parts are RoHS3 compliant or RoHS compliant, meeting environmental regulations for lead and other restricted substances.

Q: Can I use the OptiFuse FCD-1.25A if my circuit requires DC voltage protection?

A: The OptiFuse FCD-1.25A is rated for both 250V AC and 250V DC, making it suitable for AC/DC applications. Other listed parts are specified for AC voltage; verify DC requirements with the respective manufacturer before selecting for DC-only applications.

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