Littelfuse 021806.3VXP Glass Cartridge Fuse 6.3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 021806.3VXP is a 6.3 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor. This component is classified as Active product status and requires a fuse holder for installation. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and regulatory compliance certifications. Alternative models may be necessary due to inventory availability, regional certification requirements, or specific application compliance mandates.

Key Parameters

Parameter	Value
Current Rating	6.3 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	63 A
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (6.3 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and physical dimensions (5mm x 20mm). All substitute parts listed maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications are noted but do not disqualify substitution when the primary electrical and dimensional parameters match. Series designation and packaging configuration remain consistent across all qualified substitutes.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
021806.3VXP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	951
021306.3MXP	Littelfuse Inc.	213	6.3	250	63	600	0.0095	1719
021806.3HXP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	1600
021806.3MXBP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	1768
021806.3MXF34P	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	1499
021806.3MXP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	2743
021806.3TXP	Littelfuse Inc.	218	6.3	250	63	198.5	0.0076	1990
021906.3MXABP	Littelfuse Inc.	219XA	6.3	250	150	1093.035	0.0117	1551
021906.3MXAP	Littelfuse Inc.	219XA	6.3	250	150	1093.035	0.0117	1561
061806.3MXP	Littelfuse Inc.	618	6.3	250	63	198.5	0.0076	1753
0034.3125	SCHURTER Inc.	FST 5x20	6.3	250	63	190	Not Specified	59595

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical specifications (6.3 A, 250 V AC) and physical dimensions (5mm x 20mm) required for direct substitution with the 021806.3VXP. Selection among Littelfuse Series 218 variants (021806.3HXP, 021806.3MXBP, 021806.3MXF34P, 021806.3MXP, 021806.3TXP) is interchangeable based on inventory availability and regional certification requirements. The 021306.3MXP (Series 213) provides equivalent performance with higher melting I²t (600 versus 198.5) and is suitable where thermal response characteristics permit. The 219XA series parts (021906.3MXABP, 021906.3MXAP) feature elevated breaking capacity (150 A) and melting I²t (1093.035) and are applicable in circuits requiring enhanced fault current handling. The SCHURTER 0034.3125 (FST 5x20 series) offers the highest inventory availability (59,595 pcs) and is suitable for applications where cross-manufacturer sourcing is acceptable. All parts maintain ROHS3 compliance and operate across the -55°C to 125°C temperature range. Approval agency certifications vary by part number; verify regional compliance requirements (CCC, CE, CSA, UL, VDE, PSE, SEMKO, KC, UR, K-MARK, cURus, JET) against application specifications before final selection.

Frequently Asked Questions (FAQ)

Q: Can 021806.3MXP be used as a direct replacement for 021806.3VXP? A: Yes. Both parts share identical electrical ratings (6.3 A, 250 V AC), response time (slow blow), physical dimensions (5mm x 20mm), melting I²t (198.5), and DC cold resistance (0.0076 Ohms). Series 218 designation confirms compatibility.

Q: What is the difference between Series 218 and Series 219XA fuses? A: Series 219XA parts (021906.3MXABP, 021906.3MXAP) feature higher breaking capacity (150 A versus 63 A) and significantly higher melting I²t (1093.035 versus 198.5). These characteristics indicate enhanced fault current handling capability. Selection depends on circuit fault current requirements.

Q: Is the SCHURTER 0034.3125 compatible with the 021806.3VXP application? A: Yes, provided the application accepts cross-manufacturer sourcing. The SCHURTER part matches all critical parameters: 6.3 A current rating, 250 V AC voltage rating, slow-blow response, 5mm x 20mm dimensions, and 63 A breaking capacity. Melting I²t is 190 (versus 198.5), representing a negligible difference.

Q: Why do some parts list higher melting I²t values? A: Melting I²t indicates thermal energy absorption before fuse element melting. Higher values (such as 600 in the 021306.3MXP or 1093.035 in the 219XA series) reflect different fuse element designs and response characteristics. Selection must align with circuit protection requirements and thermal response specifications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance status, consistent with the 021806.3VXP.

Q: What approval agencies are relevant for my application? A: Approval agency certifications vary by part number. Common certifications across the substitute list include CCC, CE, CSA, PSE, SEMKO, and VDE. Verify that your selected part carries certifications required by your regional standards and application specifications.

Q: Can I substitute 021306.3MXP (Series 213) for 021806.3VXP (Series 218)? A: Yes, from an electrical and dimensional standpoint. However, the 021306.3MXP exhibits higher melting I²t (600 versus 198.5), indicating slower thermal response. Confirm that the application circuit protection scheme accommodates this thermal characteristic difference.

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