Littelfuse 021302.5MXP Glass Cartridge Fuse 2.5A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 021302.5MXP is a 2.5A 250VAC glass cartridge fuse in 5x20mm form factor, classified as a slow-blow fuse requiring a holder for installation. This component is active in production and widely used in industrial and consumer electronics for circuit protection. Equivalent and substitute parts are identified when designs require alternative sourcing, inventory optimization, or compliance with specific regional certifications.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 021302.5MXP is determined by strict equivalence in the following parameters: current rating (2.5A), voltage rating (250VAC), fuse type (cartridge glass), response time (slow blow), and physical package (5x20mm). All identified substitutes maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and regional approval agencies do not disqualify substitution when the primary protection characteristics remain identical. Parts are grouped by manufacturer and series designation.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (VAC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Operating Temp (°C)
021302.5MXP	Littelfuse Inc.	213	2.5	250	Slow Blow	5x20mm	35	138	0.0305	-55 ~ 125
021802.5HXP	Littelfuse	218	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	-55 ~ 125
021802.5TXP	Littelfuse Inc.	218	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	-55 ~ 125
021902.5MXAP	Littelfuse	219XA	2.5	250	Slow Blow	5x20mm	150	138	0.0305	-55 ~ 125
023902.5HXP	Littelfuse	239	2.5	250	Slow Blow	5x20mm	100	79.705	0.0583	-55 ~ 125
023902.5MXP	Littelfuse	239	2.5	250	Slow Blow	5x20mm	100	79.705	0.0583	-55 ~ 125
0034.3780	SCHURTER Inc.	FSL 5x20	2.5	250	Slow Blow	5x20mm	100	9.45	—	-40 ~ 85
GDC-2.5A	Eaton - Electronics Division	GDC	2.5	250	Slow Blow	5x20mm	35	59.4	0.0255	—
0034.3121	SCHURTER Inc.	FST 5x20	2.5	250	Slow Blow	5x20mm	35	21.9	—	-55 ~ 125
0034.5621.11	SCHURTER Inc.	SMD-FST	2.5	250	Slow Blow	5x20mm	35	21.9	—	-55 ~ 125
0034.5717.11	SCHURTER Inc.	SMD-FTT	2.5	250	Slow Blow	5x20mm	35	258	—	-55 ~ 125

Engineering Selection Recommendations

All listed substitutes maintain electrical and mechanical compatibility with the 021302.5MXP based on identical current, voltage, response time, and package specifications. Selection among substitutes should be based on the following criteria:

Littelfuse Series (213, 218, 219XA, 239): These parts share manufacturer lineage with the primary component. Series 218 and 219XA variants offer extended breaking capacity (35A to 150A) while maintaining identical melting I²t characteristics. Series 239 parts provide intermediate breaking capacity (100A) with different thermal response profiles. All Littelfuse substitutes maintain the full operating temperature range (-55°C to 125°C) and ROHS3 compliance.

SCHURTER Series (FSL, FST, SMD-FST, SMD-FTT): These parts provide cross-manufacturer equivalence with varying melting I²t values and breaking capacities. FST and SMD-FST series (0034.3121, 0034.5621.11) offer identical 35A breaking capacity and 21.9 melting I²t. FSL series (0034.3780) provides 100A breaking capacity but operates within a narrower temperature range (-40°C to 85°C). SMD-FTT series (0034.5717.11) features significantly higher melting I²t (258) for specialized slow-blow applications.

Eaton GDC-2.5A: This part matches the primary component's 35A breaking capacity and provides equivalent thermal response. Operating temperature range is not specified in available data.

Regional certification requirements should guide final selection. The 021302.5MXP carries BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE approvals. Littelfuse substitutes maintain overlapping certification coverage. SCHURTER parts carry cURus and VDE certifications. Eaton GDC-2.5A holds cURus, IMQ, and MITI/JET approvals.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 021802.5HXP for the 021302.5MXP? A: Yes. Both parts share identical current (2.5A), voltage (250VAC), response time (slow blow), and package (5x20mm) specifications. The 021802.5HXP operates across the same temperature range and maintains ROHS3 compliance. Melting I²t differs (23.25 vs. 138), but this does not affect substitution eligibility for the specified protection function.

Q: What is the difference between Littelfuse Series 213 and Series 218? A: Both series provide 2.5A 250VAC slow-blow protection in 5x20mm packages. Series 218 variants (021802.5HXP, 021802.5TXP) feature lower melting I²t (23.25) compared to Series 213 (138), resulting in faster thermal response. Breaking capacity remains 35A for both series.

Q: Can I use a SCHURTER part instead of Littelfuse? A: Yes, provided the electrical specifications match. SCHURTER FST (0034.3121) and SMD-FST (0034.5621.11) series maintain 2.5A, 250VAC, slow-blow characteristics in 5x20mm packages. Both support the full -55°C to 125°C operating range. Verify regional certification requirements, as SCHURTER parts carry different approval agency markings than Littelfuse.

Q: Does breaking capacity affect substitution? A: Breaking capacity does not disqualify substitution when current, voltage, response time, and package remain identical. The 021302.5MXP specifies 35A breaking capacity. Substitutes with higher breaking capacity (100A or 150A) provide equivalent or superior performance. Lower breaking capacity substitutes are not listed.

Q: What is melting I²t and does it matter for substitution? A: Melting I²t quantifies the thermal energy required to melt the fuse element. Variations in melting I²t among substitutes reflect different thermal response profiles within the slow-blow classification. All listed parts maintain slow-blow response time. Melting I²t differences do not prevent substitution when primary electrical parameters match.

Q: Are all substitutes ROHS3 compliant? A: Littelfuse substitutes (Series 213, 218, 219XA, 239) and SCHURTER substitutes (FST, SMD-FST, SMD-FTT) are ROHS3 compliant. Eaton GDC-2.5A compliance status is not specified in available data. Verify compliance documentation for specific applications.

Q: Can I use the 021902.5MXAP (Series 219XA) with 150A breaking capacity? A: Yes. The 021902.5MXAP maintains 2.5A, 250VAC, slow-blow, 5x20mm specifications identical to the primary part. The elevated breaking capacity (150A vs. 35A) does not affect substitution eligibility and provides enhanced fault tolerance. Note that MSL rating differs (1 vs. Not Applicable).

Q: What certifications should I verify before substitution? A: The 021302.5MXP carries BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE approvals. Verify that your selected substitute carries certifications required by your regional market and application standards. Littelfuse substitutes maintain overlapping coverage. SCHURTER and Eaton parts carry different certification sets.

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