Littelfuse 0285.315MXRP Ceramic Fuse 315mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0285.315MXRP is a 315mA 250VAC ceramic cartridge fuse with 5x20mm form factor, rated for slow-blow response. This part is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are available to maintain circuit protection functionality in applications requiring 315mA 250VAC fuse cartridges with ceramic construction and slow-blow characteristics.

Key Parameters

Parameter	Value
Current Rating	315 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5kA
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Current Rating: 315 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Breaking Capacity @ Rated Voltage: 1.5kA (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these criteria. Substitutes are grouped into two categories: Littelfuse Series 215 and 285 variants, and OptiFuse TCD series alternatives. All maintain identical electrical and mechanical specifications required for direct replacement.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity	Product Status	Melting I²t	DC Cold Resistance
0285.315MXRP	Littelfuse Inc.	285	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Obsolete	1.1	0.9275 Ω
0215.315MXP	Littelfuse Inc.	215	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	0.975	0.88 Ω
0215.315HXP	Littelfuse Inc.	215	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	0.975	0.88 Ω
0215.315MXBP	Littelfuse Inc.	215	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	0.975	0.88 Ω
0215.315MXGP	Littelfuse Inc.	215	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	0.975	0.88 Ω
0215.315TXP	Littelfuse Inc.	215	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	0.975	0.88 Ω
0215.315VXP	Littelfuse	215	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	0.975	0.88 Ω
0285.315HXP	Littelfuse Inc.	285	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	1.1	0.9275 Ω
0285.315MXP	Littelfuse Inc.	285	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	1.1	0.9275 Ω
TCD-315MA	OptiFuse	TCD	315 mA	250 V	Slow Blow	5x20mm	1.5kA	Active	Not specified	Not specified

Engineering Selection Recommendations

For applications currently using the obsolete 0285.315MXRP, the following selection criteria apply:

Littelfuse Series 215 variants (0215.315MXP, 0215.315HXP, 0215.315MXBP, 0215.315MXGP, 0215.315TXP, 0215.315VXP) are recommended as primary substitutes. All Series 215 parts are active products with CE, SEMKO, UL, and VDE approvals. These parts maintain identical electrical and mechanical specifications with lower melting I²t values (0.975 vs. 1.1) and slightly lower DC cold resistance (0.88 Ω vs. 0.9275 Ω), representing improved thermal characteristics within the same functional envelope.

Littelfuse Series 285 variants (0285.315HXP, 0285.315MXP) provide direct electrical equivalence with identical melting I²t and DC cold resistance to the original 0285.315MXRP. These are active products suitable for applications requiring Series 285 specifications.

OptiFuse TCD-315MA is an alternative from a different manufacturer meeting all critical electrical and mechanical parameters. This part carries IEC 60127 approval and is actively stocked.

All substitute parts are ROHS3 compliant and operate within the -55°C to 125°C temperature range. Selection should be based on application-specific approval requirements and existing supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can I use a Series 215 fuse as a direct replacement for the obsolete Series 285 fuse?

A: Yes. Both Series 215 and Series 285 variants meet all critical electrical and mechanical parameters: 315mA current rating, 250VAC voltage rating, slow-blow response, 5x20mm package, 1.5kA breaking capacity, and -55°C to 125°C operating temperature. The primary difference is melting I²t value (0.975 for Series 215 vs. 1.1 for Series 285), which represents thermal response characteristics. Series 215 parts are active products with broader approval certifications (CE, SEMKO, UL, VDE).

Q: What is the significance of the melting I²t difference between Series 215 and Series 285?

A: Melting I²t is a thermal energy parameter that characterizes fuse response time. Series 215 parts have a lower melting I²t (0.975) compared to the original Series 285 (1.1), indicating slightly faster thermal response. Both values fall within the slow-blow category and maintain the same current rating and voltage specifications. Application compatibility depends on circuit design tolerance for thermal response characteristics.

Q: Are all substitute parts compatible with the same fuse holder?

A: Yes. All substitute parts maintain the identical 5x20mm package specification and require the same holder type. Physical and electrical compatibility is ensured across all listed substitutes.

Q: What approvals do the substitute parts carry?

A: Littelfuse Series 215 variants carry CE, SEMKO, UL, and VDE approvals. Littelfuse Series 285 variants do not list specific approval agencies in the provided data. OptiFuse TCD-315MA carries IEC 60127 approval. Application requirements should determine which approval certifications are necessary.

Q: Is the OptiFuse TCD-315MA equivalent to the Littelfuse parts?

A: Yes. The OptiFuse TCD-315MA meets all critical electrical and mechanical specifications: 315mA, 250VAC, slow-blow response, 5x20mm package, 1.5kA breaking capacity, and -55°C to 125°C operating temperature. It is an active product with IEC 60127 approval and represents an alternative from a different manufacturer.

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