Littelfuse 021906.3MXAP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021906.3MXAP is a 6.3 A, 250 V AC slow blow glass cartridge fuse in 5mm x 20mm form factor, requiring a holder for installation. This fuse is designed for circuit protection in AC and DC applications with a breaking capacity of 150 A at rated voltage. The part is active in production with full international compliance certifications including UL, CE, CSA, and VDE. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and response characteristics to ensure direct functional replacement in protected circuits.

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
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 021906.3MXAP is determined by the following mandatory parameters:

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

All substitute parts listed below meet these core electrical and mechanical criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications do not preclude substitution when the above parameters are identical.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage AC (V)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
021906.3MXAP	Littelfuse Inc.	219XA	6.3	250	5mm x 20mm	Slow Blow	150 A	1093.035	0.0117	1561
021306.3MXP	Littelfuse Inc.	213	6.3	250	5mm x 20mm	Slow Blow	63 A	600	0.0095	1719
021806.3HXP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63 A	198.5	0.0076	1600
021806.3MXBP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63 A	198.5	0.0076	1768
021806.3MXF34P	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63 A	198.5	0.0076	1499
021806.3MXP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63 A	198.5	0.0076	2743
021806.3TXP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63 A	198.5	0.0076	990
021906.3MXABP	Littelfuse Inc.	219XA	6.3	250	5mm x 20mm	Slow Blow	150 A	1093.035	0.0117	1551
061806.3MXP	Littelfuse Inc.	618	6.3	250	5mm x 20mm	Slow Blow	63 A	198.5	0.0076	1753
0034.2524	SCHURTER Inc.	FSM 5x20	6.3	250	5mm x 20mm	Medium Blow	1 kA	159	N/A	1767
5ET 6.3-R	Bel Fuse Inc.	5ET	6.3	250	5mm x 20mm	Slow Blow	150 A	658	0.009	64646

Engineering Selection Recommendations

Littelfuse Series 219XA (021906.3MXAP and 021906.3MXABP): These parts share identical electrical and mechanical specifications with matching 150 A breaking capacity and 1093.035 melting I²t. Both carry full international compliance including UL, CE, CSA, PSE, SEMKO, and VDE certifications. Selection between these two is based on inventory availability and packaging requirements.

Littelfuse Series 218 (021806.3HXP, 021806.3MXBP, 021806.3MXF34P, 021806.3MXP, 021806.3TXP): These parts meet all core electrical and mechanical substitution criteria with 63 A breaking capacity and 198.5 melting I²t. All variants carry CCC, CE, CSA, PSE, SEMKO, and VDE certifications. The 021806.3MXP variant offers the highest inventory level (2743 pcs) among Series 218 options.

Littelfuse Series 213 (021306.3MXP): Meets all substitution parameters with 63 A breaking capacity and 600 melting I²t. Carries BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE certifications.

Littelfuse Series 618 (061806.3MXP): Meets all substitution parameters with 63 A breaking capacity and 198.5 melting I²t. Carries CCC, CE, CSA, UR, and VDE certifications.

Bel Fuse 5ET 6.3-R: Meets all core electrical and mechanical substitution criteria with 150 A breaking capacity and 658 melting I²t. Carries CCC, CE, CSA, cURus, SEMKO, and VDE certifications. Offers the highest inventory availability (64646 pcs).

SCHURTER 0034.2524: This ceramic cartridge fuse meets current, voltage, and package requirements but differs in fuse type (ceramic vs. glass) and response time (medium blow vs. slow blow). Use only when ceramic construction and medium blow response are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can I substitute a Littelfuse Series 218 fuse for the 021906.3MXAP?

A: Yes. Series 218 parts (021806.3HXP, 021806.3MXBP, 021806.3MXF34P, 021806.3MXP, 021806.3TXP) meet all mandatory substitution criteria: 6.3 A current rating, 250 V AC voltage rating, 5mm x 20mm package, glass cartridge type, and slow blow response. The difference in breaking capacity (63 A vs. 150 A) and melting I²t does not prevent substitution when circuit protection requirements are met.

Q: What is the difference between the 021906.3MXAP and 021906.3MXABP?

A: Both parts are from the Littelfuse 219XA series and are electrically and mechanically identical. They share the same 6.3 A rating, 250 V AC voltage, 5mm x 20mm package, 150 A breaking capacity, and 1093.035 melting I²t. Selection is based on inventory availability and packaging preferences.

Q: Can I use the SCHURTER 0034.2524 as a substitute?

A: The SCHURTER 0034.2524 meets the current (6.3 A), voltage (250 V AC), and package (5mm x 20mm) requirements. However, it differs in two key parameters: fuse type (ceramic instead of glass) and response time (medium blow instead of slow blow). Use this part only if your application specifically permits ceramic construction and medium blow response characteristics.

Q: Why do some substitute parts have lower breaking capacity than the 021906.3MXAP?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The 021906.3MXAP has 150 A breaking capacity, while many Series 218 variants have 63 A. Both values are sufficient for standard circuit protection applications. Selection depends on the maximum fault current expected in your specific circuit.

Q: Which substitute offers the best inventory availability?

A: The Bel Fuse 5ET 6.3-R offers the highest inventory level at 64,646 pcs. Among Littelfuse options, the 021806.3MXP (Series 218) provides 2,743 pcs, the highest availability within the Littelfuse product line.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the 021906.3MXAP environmental requirement.

Q: What certifications should I verify for my specific application?

A: All substitute parts carry multiple international certifications including CCC, CE, CSA, PSE, SEMKO, and VDE. Verify that the specific certifications required by your application region and standards are present on the selected substitute part.

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