Littelfuse 02191.25M Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 02191.25M is a 1.25 A, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 5mm x 20mm holder mounting. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original part is no longer available through standard distribution channels.

Key Parameters

Parameter	Value
Current Rating	1.25 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitute parts for the 02191.25M are selected based on matching electrical and mechanical parameters. All substitute parts maintain the same current rating (1.25 A), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (slow blow), and operating temperature range (-55°C to 125°C).

The substitute parts are organized into two series groups:

Series 213 (02131.25MXBP, 02131.25MXP, 02131.25TXP): Active status parts with RoHS3 compliance and higher melting I²t values (27.15).

Series 218 (02181.25HXP, 02181.25MXBP, 02181.25MXP, 02181.25TXP, 02181.25VXP): Active status parts with RoHS3 compliance and lower melting I²t values (12.65).

Series 219XA (02191.25MXABP, 02191.25MXAF5P): Active status parts with RoHS3 compliance, matching the original 219 series lineage with 150 A breaking capacity and 27.15 melting I²t.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Current (A)	Voltage (V AC)	Package	Response	Breaking Capacity (A)	Melting I²t	RoHS	Inventory (Pcs)
02191.25M	Littelfuse Inc.	219	Obsolete	1.25	250	5mm x 20mm	Slow Blow	150	5.8	Non-compliant	1067
02131.25MXBP	Littelfuse Inc.	213	Active	1.25	250	5mm x 20mm	Slow Blow	35	27.15	RoHS3 Compliant	1061
02131.25MXP	Littelfuse Inc.	213	Active	1.25	250	5mm x 20mm	Slow Blow	35	27.15	RoHS3 Compliant	3448
02131.25TXP	Littelfuse Inc.	213	Active	1.25	250	5mm x 20mm	Slow Blow	35	27.15	RoHS3 Compliant	842
02181.25HXP	Littelfuse Inc.	218	Active	1.25	250	5mm x 20mm	Slow Blow	35	12.65	RoHS3 Compliant	5238
02181.25MXBP	Littelfuse Inc.	218	Active	1.25	250	5mm x 20mm	Slow Blow	35	12.65	RoHS3 Compliant	1054
02181.25MXP	Littelfuse Inc.	218	Active	1.25	250	5mm x 20mm	Slow Blow	35	12.65	RoHS3 Compliant	4296
02181.25TXP	Littelfuse Inc.	218	Active	1.25	250	5mm x 20mm	Slow Blow	35	12.65	RoHS3 Compliant	1155
02181.25VXP	Littelfuse Inc.	218	Active	1.25	250	5mm x 20mm	Slow Blow	35	12.65	RoHS3 Compliant	715
02191.25MXABP	Littelfuse Inc.	219XA	Active	1.25	250	5mm x 20mm	Slow Blow	150	27.15	RoHS3 Compliant	1121
02191.25MXAF5P	Littelfuse Inc.	219XA	Active	1.25	250	5mm x 20mm	Slow Blow	150	27.15	RoHS3 Compliant	854

Engineering Selection Recommendations

All substitute parts listed are active status components with RoHS3 compliance, addressing regulatory requirements for new designs and procurement. The original 02191.25M is obsolete and non-RoHS compliant.

For applications requiring 150 A breaking capacity matching the original part specification, select from Series 219XA parts: 02191.25MXABP or 02191.25MXAF5P. These maintain the original breaking capacity while providing RoHS3 compliance and active product status.

For applications where 35 A breaking capacity is acceptable, Series 213 and Series 218 parts provide active alternatives. Series 213 parts (02131.25MXBP, 02131.25MXP, 02131.25TXP) feature higher melting I²t values (27.15). Series 218 parts (02181.25HXP, 02181.25MXBP, 02181.25MXP, 02181.25TXP, 02181.25VXP) feature lower melting I²t values (12.65).

All substitute parts maintain identical current rating, voltage rating, package dimensions, response time, and operating temperature range as the original part.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 02191.25M?

A: All listed substitute parts share the same electrical specifications (1.25 A, 250 V AC) and mechanical form factor (5mm x 20mm). Physical interchangeability is confirmed. Differences in breaking capacity and melting I²t values must be evaluated against circuit protection requirements.

Q: What is the difference between Series 213, 218, and 219XA?

A: Series 213 and 218 parts have 35 A breaking capacity, while Series 219XA parts maintain 150 A breaking capacity matching the original 02191.25M. Series 213 has melting I²t of 27.15, Series 218 has melting I²t of 12.65, and Series 219XA has melting I²t of 27.15.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are RoHS3 compliant. The original 02191.25M is RoHS non-compliant.

Q: What does melting I²t indicate?

A: Melting I²t is a thermal characteristic that defines the fuse's response to overcurrent conditions. Lower values indicate faster thermal response; higher values indicate slower thermal response within the slow-blow category.

Q: Which substitute part has the highest inventory availability?

A: The 02181.25HXP (Series 218) has the highest inventory with 5,238 pieces in stock.

Q: Do all parts require the same holder?

A: Yes. All parts are 5mm x 20mm cartridge fuses requiring a compatible 5mm x 20mm fuse holder.

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