Littelfuse 021306.3M Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021306.3M is a 6.3 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This component is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original part is no longer available through standard distribution channels.

Key Parameters

Parameter	Value
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Breaking Capacity @ Rated Voltage	63 A
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitution for the 021306.3M is determined by strict equivalence across the following electrical and mechanical parameters:

Current Rating: 6.3 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Breaking Capacity: 63 A (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Differences in series designation (213 vs. 218), melting I²t characteristics, approval agencies, and DC cold resistance do not preclude substitution when all primary parameters are equivalent.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Product Status	RoHS Status
021306.3M	Littelfuse Inc.	213	6.3	250	5mm x 20mm	Slow Blow	63	Obsolete	Non-compliant
021306.3MXBP	Littelfuse Inc.	213	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021306.3MXP	Littelfuse Inc.	213	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021306.3TXP	Littelfuse Inc.	213	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021806.3HXP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021806.3MXBP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021806.3MXF11P	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021806.3MXF34P	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021806.3MXP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021806.3TXP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant
021806.3VXP	Littelfuse Inc.	218	6.3	250	5mm x 20mm	Slow Blow	63	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical equivalence to the 021306.3M. The primary distinction between options is product status and regulatory compliance.

Series 213 substitutes (021306.3MXBP, 021306.3MXP, 021306.3TXP) provide direct series continuity with the original part while offering active product status and ROHS3 compliance. These parts are recommended for new designs and applications requiring current regulatory alignment.

Series 218 substitutes (021806.3HXP, 021806.3MXBP, 021806.3MXF11P, 021806.3MXF34P, 021806.3MXP, 021806.3TXP, 021806.3VXP) are functionally equivalent across all specified electrical and mechanical parameters. Series 218 parts carry active product status and ROHS3 compliance. Approval agency certifications differ between series; Series 213 includes BSI certification while Series 218 includes UL and K-MARK certifications.

Frequently Asked Questions (FAQ)

Q: Can Series 218 fuses replace Series 213 fuses in existing applications?

A: Yes. Both series maintain identical current rating (6.3 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), response time (slow blow), and breaking capacity (63 A). The series designation reflects internal design evolution rather than functional incompatibility at the application level.

Q: What is the difference between packaging designations (MXBP, MXP, TXP, HXP, MXF11P, MXF34P, VXP)?

A: Packaging designations indicate different distribution formats and internal construction variants. All variants maintain the same electrical specifications and 5mm x 20mm physical form factor required for standard fuse holders.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original 021306.3M is RoHS non-compliant. Substitution with any listed part upgrades regulatory compliance status.

Q: What approval agencies certify these fuses?

A: Series 213 parts carry BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE certifications. Series 218 parts carry CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE certifications. Both series meet international safety standards applicable to 6.3 A, 250 V cartridge fuses.

Q: Can I use these fuses in both AC and DC applications?

A: Yes. All parts are rated for 250 V AC/DC operation across the specified operating temperature range of -55°C to 125°C.

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