Littelfuse 028506.3MXP Ceramic Fuse 6.3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 028506.3MXP is a ceramic cartridge fuse rated for 6.3 A at 250 V AC with slow-blow response characteristics. This fuse is designed for applications requiring overcurrent protection in 5mm x 20mm holder configurations. The part maintains active product status with 1083 units in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance parameters to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Package / Case	5mm x 20mm
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	1.5 kA
Operating Temperature Range	-55°C to 125°C
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical 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, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity @ Rated Voltage: 1.5 kA (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)

Substitute parts are grouped into two categories:

Category 1: Littelfuse Series 215 & 285 Ceramic Cartridge Fuses — Parts 021506.3HXP, 021506.3MXP, 021506.3TXP, and 028506.3HXP meet all critical electrical and mechanical parameters. These parts are direct parametric equivalents with identical current, voltage, package, and response characteristics.

Category 2: SCHURTER SPT & SMD-SPT Ceramic Cartridge Fuses — Parts 0001.2512, 0001.2512.G, and 0001.2712.11 match all critical parameters with the addition of 150 V DC voltage rating capability. These parts provide equivalent AC performance with extended DC voltage protection.

Category 3: Bel Fuse & OptiFuse Ceramic Cartridge Fuses — Parts 0659C6300-12, TCC-6.3A, and TCD-6.3A meet all critical electrical and mechanical parameters with variations in breaking capacity and melting I²t characteristics within acceptable ranges for this application class.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Package	Response Time	Breaking Capacity (kA)	Melting I²t	Operating Temp (°C)	RoHS Status
028506.3MXP	Littelfuse Inc.	6.3	250	—	5x20mm	Slow Blow	1.5	130.977	-55 to 125	ROHS3
021506.3HXP	Littelfuse Inc.	6.3	250	—	5x20mm	Slow Blow	1.5	128.75	-55 to 125	ROHS3
021506.3MXP	Littelfuse Inc.	6.3	250	—	5x20mm	Slow Blow	1.5	128.75	-55 to 125	ROHS3
021506.3TXP	Littelfuse Inc.	6.3	250	—	5x20mm	Slow Blow	1.5	128.75	-55 to 125	ROHS3
028506.3HXP	Littelfuse Inc.	6.3	250	—	5x20mm	Slow Blow	1.5	130.977	-55 to 125	ROHS3
0001.2512	SCHURTER Inc.	6.3	250	150	5x20mm	Slow Blow	1.5	171	-55 to 125	ROHS3
0001.2512.G	SCHURTER Inc.	6.3	250	150	5x20mm	Slow Blow	1.5	171	-55 to 125	ROHS3
0001.2712.11	SCHURTER Inc.	6.3	250	150	5x20mm	Slow Blow	1.5	171	-55 to 125	ROHS3
0659C6300-12	Bel Fuse Inc.	6.3	250	—	5x20mm	Slow Blow	1.5	142.9	-55 to 125	ROHS3
TCC-6.3A	OptiFuse	6.3	250	—	5x20mm	Slow Blow	0.2	52.411	-55 to 125	ROHS3
TCD-6.3A	OptiFuse	6.3	250	—	5x20mm	Slow Blow	1.5	—	-55 to 125	ROHS3

Engineering Selection Recommendations

Littelfuse Series 215 & 285 Parts (021506.3HXP, 021506.3MXP, 021506.3TXP, 028506.3HXP) — These parts provide direct parametric equivalence with the main part. Series 215 variants carry expanded approval certifications including CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE. Series 285 variants carry PSE approval. Selection between these options depends on required certification scope for the target application.

SCHURTER SPT & SMD-SPT Parts (0001.2512, 0001.2512.G, 0001.2712.11) — These parts match all AC parameters and add 150 V DC voltage rating capability. Approval certifications include CCC, cURus, KC, PSE/JET, and VDE. The .G variant of 0001.2512 and the SMD-SPT series 0001.2712.11 provide alternative sourcing options with identical electrical performance.

Bel Fuse 0659C6300-12 — This part meets all critical parameters with CCC, cURus, PSE, and VDE certifications. Melting I²t of 142.9 falls within the acceptable range for this application class.

OptiFuse TCD-6.3A — This part matches all critical parameters with cURus and IEC 60127 certifications. Breaking capacity of 1.5 kA aligns with the main part specification.

OptiFuse TCC-6.3A — This part matches current, voltage, package, and response characteristics but carries a reduced breaking capacity of 200 A versus 1.5 kA. This part is suitable only for applications where the lower breaking capacity is acceptable. Certifications include cULus and UL 248.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in place of the Littelfuse 028506.3MXP?

A: All listed substitute parts are mechanically and electrically compatible for direct installation in 5mm x 20mm fuse holders. However, application-specific certification requirements may limit selection. Verify that the substitute part's approval certifications (PSE, UL, CE, etc.) match your equipment's regulatory requirements.

Q: What is the difference between Littelfuse Series 215 and Series 285 parts?

A: Both series meet identical electrical and mechanical parameters. Series 215 parts (021506.3HXP, 021506.3MXP, 021506.3TXP) carry broader certification coverage including UL, CE, and CSA. Series 285 parts (028506.3MXP, 028506.3HXP) carry PSE certification. Selection depends on your target market and regulatory requirements.

Q: Why do SCHURTER parts have a 150 V DC rating when the main part does not specify DC voltage?

A: SCHURTER parts provide extended DC voltage protection capability. In AC-only applications, this additional rating does not affect performance. In mixed AC/DC applications, SCHURTER parts offer enhanced protection. The 150 V DC rating is a superset of the main part's AC-only specification and does not create incompatibility.

Q: What does melting I²t represent and why does it vary between parts?

A: Melting I²t is a thermal energy parameter that characterizes fuse response time. Variations in melting I²t (ranging from 52.411 to 171 in the substitute list) reflect differences in fuse element composition and design. All listed parts maintain slow-blow response characteristics appropriate for this application class. Melting I²t differences do not affect interchangeability for standard overcurrent protection applications.

Q: Can I use OptiFuse TCC-6.3A if my application requires 1.5 kA breaking capacity?

A: OptiFuse TCC-6.3A carries a breaking capacity of 200 A, which is lower than the 1.5 kA specification of the main part. Use this part only if your application's fault current does not exceed 200 A. For applications requiring 1.5 kA breaking capacity, select from parts with matching 1.5 kA ratings: Littelfuse Series 215 & 285, SCHURTER SPT series, Bel Fuse 0659C6300-12, or OptiFuse TCD-6.3A.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts carry RoHS3 compliance status, matching the main part's environmental compliance profile.

Q: What certifications should I prioritize when selecting a substitute?

A: Certification selection depends on your equipment's target market. PSE certification is required for Japanese markets. UL and cULus certifications are required for North American markets. CE and VDE certifications are required for European markets. CCC certification is required for Chinese markets. Review your equipment's regulatory requirements and select a substitute part with matching certification coverage.

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