Littelfuse 021306.3MXP Glass Cartridge Fuse 6.3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 021306.3MXP is a 6.3 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor, designed for applications requiring slow-blow response characteristics. This Series 213 fuse is an active product with full regulatory compliance across multiple international standards. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and approval agency certifications to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
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 critical parameters:

Current Rating: 6.3 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Configuration: Requires Holder (exact match required)

Parts are grouped into two categories based on Breaking Capacity and Melting I²t characteristics:

Category A (Standard Breaking Capacity 63A): Littelfuse Series 218 variants (021806.3HXP, 021806.3MXBP, 021806.3MXF34P, 021806.3MXP, 021806.3TXP), Littelfuse Series 618 (061806.3MXP), and SCHURTER FST 5x20 series (0034.3125, 0034.5625.11). These parts share identical electrical performance with the main part.

Category B (Enhanced Breaking Capacity 150A): Littelfuse Series 219XA variants (021906.3MXABP, 021906.3MXAP). These parts provide higher breaking capacity and melting I²t values while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
021306.3MXP	Littelfuse	213	6.3	250	5x20mm	Slow Blow	63	600	0.0095	Active
021806.3HXP	Littelfuse	218	6.3	250	5x20mm	Slow Blow	63	198.5	0.0076	Active
021806.3MXBP	Littelfuse	218	6.3	250	5x20mm	Slow Blow	63	198.5	0.0076	Active
021806.3MXF34P	Littelfuse	218	6.3	250	5x20mm	Slow Blow	63	198.5	0.0076	Active
021806.3MXP	Littelfuse	218	6.3	250	5x20mm	Slow Blow	63	198.5	0.0076	Active
021806.3TXP	Littelfuse	218	6.3	250	5x20mm	Slow Blow	63	198.5	0.0076	Active
021906.3MXABP	Littelfuse	219XA	6.3	250	5x20mm	Slow Blow	150	1093.035	0.0117	Active
021906.3MXAP	Littelfuse	219XA	6.3	250	5x20mm	Slow Blow	150	1093.035	0.0117	Active
061806.3MXP	Littelfuse	618	6.3	250	5x20mm	Slow Blow	63	198.5	0.0076	Active
0034.3125	SCHURTER	FST 5x20	6.3	250	5x20mm	Slow Blow	63	190	—	Active
0034.5625.11	SCHURTER	SMD-FST	6.3	250	5x20mm	Slow Blow	63	190	—	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and are ROHS3 compliant. Selection between Category A and Category B substitutes depends on application breaking capacity requirements:

Category A substitutes (Littelfuse Series 218, Series 618, and SCHURTER FST series) are direct functional equivalents with 63 A breaking capacity, matching the original 021306.3MXP specification. These parts are suitable for standard circuit protection applications where breaking capacity of 63 A is specified or required.

Category B substitutes (Littelfuse Series 219XA variants) provide enhanced breaking capacity of 150 A and higher melting I²t values. These parts are suitable for applications requiring higher fault current interruption capability while maintaining identical 6.3 A, 250 V AC/DC ratings and 5x20mm form factor.

Approval agency certifications vary across substitute parts. The original 021306.3MXP carries BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE approvals. Verify that selected substitute parts carry certifications required by your application's regulatory framework and end-use market.

Frequently Asked Questions (FAQ)

Q: Can I use a Series 219XA fuse (021906.3MXABP or 021906.3MXAP) as a direct replacement for the 021306.3MXP?

A: Yes. Both parts share identical current rating (6.3 A), voltage rating (250 V AC), package dimensions (5x20mm), response time (slow blow), and mounting configuration (requires holder). The Series 219XA variants provide higher breaking capacity (150 A vs. 63 A) and higher melting I²t, making them suitable for applications with higher fault current levels. Verify that your application's circuit design and holder specifications support the Series 219XA variant.

Q: What is the difference between Littelfuse Series 218 and Series 213 fuses?

A: Both series share identical electrical ratings (6.3 A, 250 V AC), package dimensions (5x20mm), and response time (slow blow). The primary differences are in melting I²t values and approval agency certifications. Series 218 variants have melting I²t of 198.5 compared to Series 213's 600, and Series 218 carries UL and K-MARK approvals not present on the original part. Selection depends on your specific application requirements and regulatory certifications needed.

Q: Are SCHURTER 0034.3125 and 0034.5625.11 fuses compatible with Littelfuse holders?

A: Both SCHURTER parts match the 5x20mm form factor and all electrical specifications (6.3 A, 250 V AC, slow blow response). Mechanical compatibility with specific Littelfuse holders depends on holder design tolerances. Verify holder specifications before substitution.

Q: Why do some substitute parts have different DC cold resistance values?

A: DC cold resistance variations (ranging from 0.0076 Ω to 0.0117 Ω) reflect differences in internal element design across series and manufacturers. These variations do not affect functional interchangeability for circuit protection applications at the specified 6.3 A, 250 V AC rating. All parts maintain the same response time classification (slow blow) and breaking capacity within their respective categories.

Q: Can I substitute a 63 A breaking capacity fuse with a 150 A breaking capacity fuse?

A: Yes. The 150 A breaking capacity fuses (Series 219XA) provide enhanced fault current interruption capability. This substitution is suitable when your application may experience higher fault currents than the original 63 A specification. Verify that your circuit design and application requirements support the higher breaking capacity rating.

Q: What approval agencies are critical for my application?

A: Approval agency requirements depend on your end-use market and regulatory framework. The original 021306.3MXP carries BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE certifications. Review your application's regulatory requirements and select a substitute part carrying the necessary certifications. Not all substitute parts carry identical certification sets.

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