Littelfuse 0312.062H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312.062H is a 62 mA, 250 V AC/DC fast-blow glass cartridge fuse in the 312 series, designed for 3AB and 3AG holder applications with dimensions of 0.250" diameter × 1.250" length. This part is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain circuit protection functionality in applications where the original part is no longer readily available or where design updates require active-status alternatives.

Key Parameters

Parameter	Value
Current Rating	62 mA
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" × 1-1/4"
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	0.000249
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	24.5 Ohms (main part); 24.7 Ohms (substitutes)
Size / Dimension	0.250" Dia × 1.250" L (6.35 mm × 31.75 mm)

Substitute Part Grouping Explanation

Substitute parts for the 0312.062H are qualified based on the following criteria:

Current Rating: All substitutes maintain 62 mA
Voltage Rating: All substitutes maintain 250 V AC
Response Time: All substitutes maintain Fast Blow characteristic
Fuse Type: All substitutes are Cartridge, Glass construction
Package / Case: All substitutes fit 3AB, 3AG holders with identical 0.250" × 1.250" dimensions
Breaking Capacity: All substitutes maintain 35 A @ rated voltage
Melting I²t: All substitutes maintain 0.000249 value
Operating Temperature: All substitutes maintain -55°C ~ 125°C range

The substitute parts differ primarily in product status (active vs. obsolete), packaging format, and compliance certifications. All substitutes are manufactured by Littelfuse Inc. within the 312 series.

Parameter Comparison

Part Number	Manufacturer	Product Status	Current Rating	Voltage Rating (AC)	Response Time	Breaking Capacity	Melting I²t	DC Cold Resistance	RoHS Status	Approval Agency	Inventory (Pcs)
0312.062H	Littelfuse Inc.	Obsolete	62 mA	250 V	Fast Blow	35 A	0.000249	24.5 Ohms	RoHS non-compliant	CSA, UL	929
0312.062HXP	Littelfuse Inc.	Active	62 mA	250 V	Fast Blow	35 A	0.000249	24.7 Ohms	ROHS3 Compliant	CE, CSA, UL	738
0312.062HXCCP	Littelfuse Inc.	Active	62 mA	250 V	Fast Blow	35 A	0.000249	24.7 Ohms	ROHS3 Compliant	CE, CSA, UL	887
0312.062MXCCP	Littelfuse Inc.	Active	62 mA	250 V	Fast Blow	35 A	0.000249	24.7 Ohms	ROHS3 Compliant	CE, CSA, UL	617
0312.062MXP	Littelfuse Inc.	Active	62 mA	250 V	Fast Blow	35 A	0.000249	24.7 Ohms	ROHS3 Compliant	CE, CSA, UL	1908
0312.062VXP	Littelfuse Inc.	Active	62 mA	250 V	Fast Blow	35 A	0.000249	24.7 Ohms	ROHS3 Compliant	CE, CSA, UL	909

Engineering Selection Recommendations

All substitute parts maintain electrical and mechanical equivalence to the 0312.062H. Selection among substitutes should be based on the following factors:

Product Status: The 0312.062H is obsolete. All listed substitutes (0312.062HXP, 0312.062HXCCP, 0312.062MXCCP, 0312.062MXP, 0312.062VXP) are active-status parts, ensuring continued availability and manufacturing support.

Compliance: The original 0312.062H carries CSA and UL approvals but is RoHS non-compliant. All substitute parts are ROHS3 compliant and carry CE, CSA, and UL approvals, meeting current regulatory requirements.

Packaging and Availability: Substitute parts are available in bulk packaging. The 0312.062MXP offers the highest inventory level (1908 pcs), followed by 0312.062HXCCP (887 pcs) and 0312.062VXP (909 pcs).

DC Cold Resistance: Substitute parts exhibit 24.7 Ohms compared to 24.5 Ohms in the original part. This minor variance remains within acceptable tolerance for cartridge fuse applications.

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts directly replace the 0312.062H in existing applications?

A: Yes. All substitute parts maintain identical current rating (62 mA), voltage rating (250 V AC), response time (fast blow), physical dimensions (0.250" × 1.250"), and holder compatibility (3AB, 3AG). They are electrically and mechanically equivalent.

Q: What is the difference between the various substitute part numbers?

A: The part numbers reflect different packaging and certification variants within the 312 series. All listed substitutes meet the same electrical specifications and approval agencies (CE, CSA, UL). Differences are limited to packaging format and internal manufacturing designations.

Q: Why is the DC cold resistance slightly different in substitute parts?

A: The DC cold resistance variance (24.7 Ohms vs. 24.5 Ohms) is within normal manufacturing tolerance for glass cartridge fuses and does not affect circuit protection performance or compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are ROHS3 compliant, whereas the original 0312.062H is RoHS non-compliant. This makes substitutes suitable for applications requiring RoHS compliance.

Q: Which substitute part should I select for new designs?

A: For new designs, any active-status substitute is appropriate. Selection may be based on packaging preference, availability, or supply chain considerations. The 0312.062MXP offers the highest current inventory level.

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