Littelfuse 061801.6MXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 061801.6MXP is a 1.6 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm package format, 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 design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific certification requirements for target applications.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 061801.6MXP is determined by strict equivalence across the following parameters: current rating (1.6 A), voltage rating (250 V AC), response time (slow blow), physical package (5mm x 20mm), fuse type (cartridge glass), and mounting requirement (requires holder). All identified substitute parts maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications do not disqualify parts from substitution eligibility but may influence selection based on application-specific requirements.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)
061801.6MXP	Littelfuse Inc.	618	1.6	250	Slow Blow	5x20mm	35	23.35	0.0336	10400
021301.6MXP	Littelfuse Inc.	213	1.6	250	Slow Blow	5x20mm	35	44.2	0.0551	1001
021301.6TXP	Littelfuse Inc.	213	1.6	250	Slow Blow	5x20mm	35	44.2	0.0551	904
021801.6HXP	Littelfuse Inc.	218	1.6	250	Slow Blow	5x20mm	35	23.35	0.0336	1213
021801.6MXP	Littelfuse Inc.	218	1.6	250	Slow Blow	5x20mm	35	23.35	0.0336	2622
021801.6TXP	Littelfuse Inc.	218	1.6	250	Slow Blow	5x20mm	35	23.35	0.0336	704
021901.6MXABP	Littelfuse Inc.	219XA	1.6	250	Slow Blow	5x20mm	150	44.2	0.0551	2757
021901.6MXAP	Littelfuse Inc.	219XA	1.6	250	Slow Blow	5x20mm	150	44.2	0.0551	2200
023901.6HXP	Littelfuse Inc.	239	1.6	250	Slow Blow	5x20mm	100	30.43	0.1205	2100
023901.6MXP	Littelfuse Inc.	239	1.6	250	Slow Blow	5x20mm	100	30.43	0.1205	5626
0034.3119	SCHURTER Inc.	FST 5x20	1.6	250	Slow Blow	5x20mm	35	10.5	—	8955

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical equivalence to the 061801.6MXP across current rating, voltage, response time, and physical dimensions. Selection among substitutes should be based on the following criteria:

Littelfuse Series 218 parts (021801.6HXP, 021801.6MXP, 021801.6TXP) share identical melting I²t (23.35) and DC cold resistance (0.0336 Ω) with the main part, providing closest thermal and electrical performance match. These parts carry expanded certification coverage including K-MARK, PSE, SEMKO, and UL approvals.

Littelfuse Series 213 parts (021301.6MXP, 021301.6TXP) feature higher melting I²t (44.2) and DC cold resistance (0.0551 Ω), with broader approval agency coverage including BSI and PSE certifications.

Littelfuse Series 219XA parts (021901.6MXABP, 021901.6MXAP) provide elevated breaking capacity (150 A versus 35 A) with identical melting I²t (44.2) and DC cold resistance (0.0551 Ω) to Series 213. These parts are suitable for applications requiring higher fault current withstand capability.

Littelfuse Series 239 parts (023901.6HXP, 023901.6MXP) offer intermediate breaking capacity (100 A) with melting I²t of 30.43 and elevated DC cold resistance (0.1205 Ω). Certification scope is limited to CE, CSA, KC, PSE, and UL.

SCHURTER FST 5x20 (0034.3119) is a cross-manufacturer equivalent from an alternative supplier, maintaining core electrical specifications with breaking capacity of 35 A and melting I²t of 10.5. This part carries CCC, cURus, PSE/JET, and VDE certifications.

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts be used interchangeably with the 061801.6MXP?

A: Yes, all listed parts are electrically and mechanically equivalent based on current rating (1.6 A), voltage rating (250 V AC), response time (slow blow), and physical package (5mm x 20mm). Selection should account for application-specific requirements regarding breaking capacity, thermal response characteristics, and required certifications.

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

A: Melting I²t represents the thermal energy required to melt the fuse element. The 061801.6MXP has a melting I²t of 23.35. Series 213 and 219XA parts have higher values (44.2), while Series 239 has 30.43, and SCHURTER FST has 10.5. These differences affect the fuse's response to transient overcurrent conditions and should be evaluated against circuit protection requirements.

Q: Are there certification differences that affect substitution?

A: Yes. The 061801.6MXP carries CCC, CE, CSA, UR, and VDE approvals. Series 218 substitutes add K-MARK, PSE, SEMKO, and UL. Series 213 adds BSI and PSE. Series 239 is limited to CE, CSA, KC, PSE, and UL. SCHURTER 0034.3119 carries CCC, cURus, PSE/JET, and VDE. Verify that substitute certifications meet target market and application requirements.

Q: What does breaking capacity mean, and why do some substitutes have higher values?

A: Breaking capacity is the maximum fault current the fuse can safely interrupt at rated voltage. The 061801.6MXP has 35 A breaking capacity. Series 219XA substitutes provide 150 A, Series 239 provides 100 A. Higher breaking capacity does not affect normal operation but provides enhanced protection in high-fault-current environments. Selection should match circuit fault current levels.

Q: Can I use a SCHURTER part as a substitute for a Littelfuse part?

A: Yes. The SCHURTER 0034.3119 maintains electrical and mechanical equivalence across all core parameters. However, verify that SCHURTER certifications (CCC, cURus, PSE/JET, VDE) satisfy application and regional requirements, as they differ from Littelfuse certification profiles.

Q: Does DC cold resistance variation affect substitution suitability?

A: DC cold resistance affects voltage drop across the fuse during normal operation. The 061801.6MXP has 0.0336 Ω. Series 213 and 219XA have 0.0551 Ω (higher), Series 239 has 0.1205 Ω (significantly higher), and SCHURTER data is not provided. In low-voltage or high-current applications, higher resistance may introduce measurable voltage drop. Evaluate circuit tolerance for this parameter.

Q: Are all substitutes in active product status?

A: Yes, all listed substitute parts are classified as Active product status, indicating current manufacturing and availability.

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