Littelfuse 021301.6MXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021301.6MXP is a 1.6 A, 250 V AC/DC glass cartridge fuse in a 5mm x 20mm package with slow-blow response characteristics. This fuse is designed for applications requiring overcurrent protection in industrial and commercial equipment. The part maintains Active product status and is RoHS3 compliant. Substitute parts become necessary when the primary part is unavailable, when specific approval agency certifications are required for regional compliance, or when alternative series options provide equivalent electrical performance with different mechanical or thermal characteristics.

Key Parameters

Parameter	Value
Current Rating	1.6 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 ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 021301.6MXP is determined by strict equivalence across the following parameters: current rating (1.6 A), voltage rating (250 V AC), fuse type (cartridge glass), physical package (5mm x 20mm), response time (slow blow), and mounting requirement (requires holder). All listed substitute parts match these core electrical and mechanical specifications. Differences in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications do not disqualify a part from substitution but indicate performance variations in specific application contexts. Operating temperature range variations and series designation changes reflect manufacturing differences within the same functional category.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Operating Temp (°C)	Inventory (Pcs)
021301.6MXP	Littelfuse Inc.	213	1.6	250	35	44.2	0.0551	-55 ~ 125	1001
021301.6TXP	Littelfuse Inc.	213	1.6	250	35	44.2	0.0551	-55 ~ 125	904
021801.6HXP	Littelfuse Inc.	218	1.6	250	35	23.35	0.0336	-55 ~ 125	1213
021801.6MXP	Littelfuse Inc.	218	1.6	250	35	23.35	0.0336	-55 ~ 125	2622
021801.6TXP	Littelfuse Inc.	218	1.6	250	35	23.35	0.0336	-55 ~ 125	704
021901.6MXABP	Littelfuse Inc.	219XA	1.6	250	150	44.2	0.0551	-55 ~ 125	2757
021901.6MXAP	Littelfuse Inc.	219XA	1.6	250	150	44.2	0.0551	-55 ~ 125	2200
023901.6HXP	Littelfuse Inc.	239	1.6	250	100	30.43	0.1205	-55 ~ 125	2100
023901.6MXP	Littelfuse Inc.	239	1.6	250	100	30.43	0.1205	-55 ~ 125	5626
061801.6MXP	Littelfuse Inc.	618	1.6	250	35	23.35	0.0336	-55 ~ 125	10400
0034.3778	SCHURTER Inc.	FSL 5x20	1.6	250	100	2.93	—	-40 ~ 85	1764

Engineering Selection Recommendations

All Littelfuse substitute parts (Series 213, 218, 219XA, 239, and 618) maintain identical electrical ratings and physical dimensions to the 021301.6MXP. Selection among Littelfuse options depends on approval agency requirements: Series 213 and 219XA variants include BSI certification; Series 218 variants include K-MARK and UL certifications; Series 239 variants include KC and UL certifications; Series 618 includes UR and VDE certifications. The 021901.6MXABP and 021901.6MXAP (Series 219XA) provide the highest breaking capacity at 150 A, suitable for applications with elevated fault current levels. The SCHURTER 0034.3778 (FSL 5x20 series) is a manufacturer-recommended alternative with cULus certification and a reduced operating temperature range of -40°C to 85°C; this part exhibits significantly lower melting I²t (2.93) and should be selected only when SCHURTER certification is explicitly required or when the narrower temperature range is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts for the 021301.6MXP without circuit modification?

A: Yes. All Littelfuse substitute parts listed maintain the same 1.6 A current rating, 250 V voltage rating, slow-blow response, and 5mm x 20mm physical package. Direct substitution in the fuse holder is mechanically and electrically compatible. The SCHURTER 0034.3778 is also physically and electrically compatible but operates within a narrower temperature range (-40°C to 85°C versus -55°C to 125°C).

Q: What is the significance of different breaking capacity ratings?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The 021301.6MXP has a 35 A breaking capacity. Littelfuse Series 219XA variants (021901.6MXABP, 021901.6MXAP) provide 150 A breaking capacity, and Series 239 variants provide 100 A. Higher breaking capacity does not affect normal operation but provides enhanced safety margin in high-fault-current environments. Lower breaking capacity is not a limitation for applications with fault currents below the rated value.

Q: How do approval agency certifications affect part selection?

A: Approval agencies (BSI, CCC, CE, CSA, UL, VDE, etc.) certify fuse performance according to regional standards. Equipment designed for specific markets may require fuses with corresponding certifications. The 021301.6MXP includes BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE certifications. Substitute parts with overlapping certifications are suitable for the same markets. The SCHURTER 0034.3778 carries cULus certification and is appropriate for North American applications requiring UL/CSA compliance.

Q: What does melting I²t represent, and why does it vary among substitutes?

A: Melting I²t is a thermal energy parameter indicating the fuse element's response to overcurrent. The 021301.6MXP has a melting I²t of 44.2. Series 218 and 618 variants have 23.35, Series 239 has 30.43, and SCHURTER has 2.93. Lower I²t values indicate faster response to overcurrent. All values are within the slow-blow category and are suitable for general-purpose protection. Selection based on I²t is application-specific and depends on circuit protection coordination requirements.

Q: Is the SCHURTER 0034.3778 a direct equivalent?

A: The SCHURTER 0034.3778 is electrically and mechanically compatible with identical current, voltage, and package specifications. However, it operates within a narrower temperature range (-40°C to 85°C) compared to the 021301.6MXP (-55°C to 125°C). Select the SCHURTER part only when the operating environment remains within -40°C to 85°C and when cULus certification is required or preferred.

Q: Which substitute offers the best inventory availability?

A: The Littelfuse 061801.6MXP (Series 618) has the highest inventory at 10,400 pieces. The 023901.6MXP (Series 239) has 5,626 pieces. Both are suitable direct substitutes with full electrical and mechanical compatibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message