Littelfuse 0215012.M Ceramic Fuse 12A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0215012.M is a 12A 250VAC ceramic cartridge fuse in 5x20mm form factor, designed for circuit protection in AC and DC applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse requires a compatible holder for installation and operates across a temperature range of -55°C to 125°C with a slow-blow response characteristic.

Key Parameters

Parameter	Value
Current Rating	12 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Mounting Type	Requires Holder
Operating Temperature	-55°C to 125°C
Breaking Capacity @ Rated Voltage	1.5kA

Substitute Part Grouping Explanation

Substitution for the 0215012.M is determined by strict equivalence across the following parameters: current rating (12A), voltage rating (250VAC), package dimensions (5x20mm), fuse type (ceramic cartridge), response characteristic (slow blow), and mounting requirement (holder-based). All substitute parts listed maintain these core electrical and mechanical specifications.

Littelfuse parametric equivalents (0215012.MXBP, 0215012.MXGP, 0215012.MXP, 0215012.TXP) are direct functional replacements within the same manufacturer's product line. Cross-manufacturer alternatives from Eaton (BK/S505-12-R, BK1/S505-12-R) and OptiFuse (TCC-12A, TCD-12A) provide equivalent protection characteristics while meeting the same dimensional and electrical requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Product Status	RoHS Status
0215012.M	Littelfuse Inc.	12	250	5x20mm	Slow Blow	1.5kA	Obsolete	RoHS non-compliant
0215012.MXBP	Littelfuse Inc.	12	250	5x20mm	Slow Blow	1.5kA	Active	ROHS3 Compliant
0215012.MXGP	Littelfuse Inc.	12	250	5x20mm	Slow Blow	1.5kA	Active	ROHS3 Compliant
0215012.MXP	Littelfuse Inc.	12	250	5x20mm	Slow Blow	1.5kA	Active	ROHS3 Compliant
0215012.TXP	Littelfuse Inc.	12	250	5x20mm	Slow Blow	1.5kA	Active	ROHS3 Compliant
BK/S505-12-R	Eaton - Electronics Division	12	250	5x20mm	Slow Blow	1kA	Active	ROHS3 Compliant
BK1/S505-12-R	Eaton - Electronics Division	12	250	5x20mm	Slow Blow	1kA	Active	ROHS3 Compliant
TCC-12A	OptiFuse	12	250	5x20mm	Slow Blow	750A	Active	ROHS3 Compliant
TCD-12A	OptiFuse	12	250	5x20mm	Slow Blow	1.5kA	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and ongoing applications, Littelfuse parametric equivalents (0215012.MXBP, 0215012.MXGP, 0215012.MXP, 0215012.TXP) are the primary substitutes. All four variants are active products with ROHS3 compliance and equivalent electrical performance. The 0215012.MXP variant offers the highest inventory availability (16,400 units) for supply chain continuity.

Eaton S505 series fuses (BK/S505-12-R, BK1/S505-12-R) provide active alternatives with cULus and VDE certifications. These parts maintain the 12A/250V specification and 5x20mm form factor, though breaking capacity is rated at 1kA compared to the original 1.5kA specification.

OptiFuse TCD-12A and TCC-12A are functionally equivalent ceramic cartridge fuses meeting IEC 60127 and UL 248 standards respectively. TCD-12A maintains the 1.5kA breaking capacity of the original part, while TCC-12A is rated at 750A breaking capacity.

All substitute parts are ROHS3 compliant, addressing the non-compliance status of the obsolete 0215012.M. Selection should prioritize active product status and compliance certifications appropriate to the application's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 0215012.M with any of these substitute parts?

A: Yes. All listed substitutes maintain the critical electrical parameters: 12A current rating, 250V AC voltage rating, slow-blow response, and 5x20mm ceramic cartridge form factor. Physical compatibility with existing fuse holders is guaranteed across all alternatives.

Q: What is the difference between Littelfuse parametric equivalents (MXBP, MXGP, MXP, TXP)?

A: These variants are functionally identical in electrical performance and mechanical dimensions. Differences are limited to packaging configuration and distribution channel. All four maintain 1.5kA breaking capacity and ROHS3 compliance. Selection can be based on inventory availability and packaging preference (bulk).

Q: How do Eaton S505 fuses compare to the original Littelfuse part?

A: Eaton BK/S505-12-R and BK1/S505-12-R maintain the 12A/250V specification and 5x20mm dimensions. The primary difference is breaking capacity: Eaton rates these at 1kA versus the original 1.5kA. Both are ROHS3 compliant with active product status and cULus/VDE certifications.

Q: What is the difference between OptiFuse TCD-12A and TCC-12A?

A: Both are 12A/250V ceramic cartridge fuses in 5x20mm form factor with slow-blow response. TCD-12A maintains 1.5kA breaking capacity and follows IEC 60127 standards. TCC-12A is rated at 750A breaking capacity and follows UL 248 standards. Selection depends on breaking capacity requirements for the specific application.

Q: Are all substitutes RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original 0215012.M is RoHS non-compliant. Substitution with any listed alternative addresses RoHS compliance requirements for new designs and updated systems.

Q: Which substitute offers the best supply chain availability?

A: Littelfuse 0215012.MXP provides the highest inventory level at 16,400 units in stock, followed by OptiFuse TCD-12A at 7,773 units. Both are active products with established supply chains.

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