Littelfuse 021806.3MXEP Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 021806.3MXEP is a 6.3 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm axial package configuration. This component is classified as Active product status and is designed for through-hole mounting applications requiring overcurrent protection in industrial and commercial equipment. Equivalent and substitute parts are identified when identical electrical ratings, mechanical dimensions, and functional characteristics are maintained across different manufacturers or product series.

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 (Axial)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 021806.3MXEP 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)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

All substitute parts listed below meet these core electrical and mechanical criteria. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and dimensional tolerances do not preclude substitution when primary parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Operating Temperature (°C)	RoHS Status
021806.3MXEP	Littelfuse Inc.	6.3	250	Slow Blow	5mm x 20mm	63	198.5	0.0076	-55 ~ 125	ROHS3 Compliant
021306.3MXEP	Littelfuse Inc.	6.3	250	Slow Blow	5mm x 20mm	63	600	0.0095	-55 ~ 125	ROHS3 Compliant
021906.3MXAEP	Littelfuse Inc.	6.3	250	Slow Blow	5mm x 20mm	150	1093.035	0.0117	-55 ~ 125	ROHS3 Compliant
0034.3125.PT	SCHURTER Inc.	6.3	250	Slow Blow	5mm x 20mm	63	190	—	-55 ~ 125	ROHS3 Compliant
0034.3125.TR	SCHURTER Inc.	6.3	250	Slow Blow	5mm x 20mm	63	190	—	-55 ~ 125	ROHS3 Compliant
5STP 6.3-R	Bel Fuse Inc.	6.3	250	Slow Blow	5mm x 20mm	63	160	0.008	-55 ~ 125	ROHS3 Compliant
BK/S506-V-6.3-R	Eaton - Electronics Division	6.3	250	Slow Blow	5mm x 20mm	63	237.6	0.0071	-55 ~ 125	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance. Selection among equivalent parts should be based on:

Approval agency certifications required for the target application (CCC, CE, CSA, UL, VDE, etc.)
Packaging format availability (Bulk, Cut Tape)
Inventory availability and lead time
DC cold resistance tolerance requirements for specific circuit designs
Breaking capacity specifications if application demands exceed 63 A rating

The Littelfuse 021906.3MXAEP offers enhanced breaking capacity (150 A) compared to the main part (63 A), suitable for applications requiring higher fault current withstand capability. The SCHURTER 0034.3125 series provides two packaging options (Bulk and Cut Tape) for procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can 021306.3MXEP replace 021806.3MXEP directly? A: Yes. Both parts share identical electrical ratings (6.3 A, 250 V AC), fuse type (Cartridge, Glass), response time (Slow Blow), and package dimensions (5mm x 20mm). The difference in melting I²t (600 vs. 198.5) reflects series variation but does not affect substitution eligibility for equivalent protection.

Q: What is the difference between SCHURTER 0034.3125.PT and 0034.3125.TR? A: Both parts are electrically and mechanically identical. The difference is packaging format: .PT denotes Bulk packaging, while .TR denotes Cut Tape (CT) packaging. Selection depends on procurement and assembly requirements.

Q: Is 021906.3MXAEP suitable as a substitute for 021806.3MXEP? A: Yes. The 021906.3MXAEP meets all core substitution criteria. It offers higher breaking capacity (150 A vs. 63 A), which provides additional fault current protection margin without affecting normal operation.

Q: Can I use Bel Fuse 5STP 6.3-R or Eaton BK/S506-V-6.3-R as replacements? A: Yes. Both parts are direct substitutes meeting all electrical and mechanical requirements. Verify that required approval certifications (CCC, CE, CSA, VDE, etc.) align with your application standards before selection.

Q: Are there packaging considerations when substituting between manufacturers? A: Yes. Littelfuse parts are available in Bulk packaging. SCHURTER offers both Bulk (PT) and Cut Tape (TR) options. Bel Fuse and Eaton supply Bulk packaging. Confirm packaging compatibility with your assembly process before procurement.

Q: What approval agencies certify these substitute parts? A: All parts carry multiple certifications. Common certifications include CCC, CE, CSA, VDE, and SEMKO. Littelfuse 021906.3MXAEP and Eaton BK/S506-V-6.3-R include UL certification. Verify specific certifications required for your application region and equipment standard.

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