Littelfuse 0318.062H Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318.062H is a 62 mA, 250 V AC/DC fast-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Direct replacements with identical electrical and mechanical specifications are available from the same manufacturer in active product status.

Key Parameters

Parameter	Value
Current Rating	62 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	0.000249
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	24.5 Ohms (main part)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the 0318.062H is determined by strict equivalence across the following critical parameters:

Current Rating: 62 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Breaking Capacity: 35 A (exact match required)
Melting I²t: 0.000249 (exact match required)
Physical Dimensions: 0.275" Dia x 1.288" L (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Through Hole (exact match required)

All three substitute parts (0318.062HXP, 0318.062MXP, 0318.062VXP) meet these criteria and are manufactured by Littelfuse Inc. in the 318 series.

Parameter Comparison

Parameter	0318.062H (Main)	0318.062HXP	0318.062MXP	0318.062VXP
Current Rating (Amps)	62 mA	62 mA	62 mA	62 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A
Melting I²t	0.000249	0.000249	0.000249	0.000249
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	24.5 Ohms	24.7 Ohms	24.7 Ohms	24.7 Ohms
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
Approval Agency	CSA, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C

Engineering Selection Recommendations

All three substitute parts (0318.062HXP, 0318.062MXP, 0318.062VXP) are direct electrical and mechanical equivalents to the 0318.062H. The primary distinctions are:

Product Status: The main part is obsolete; all substitutes are active products with current manufacturing support.

Compliance & Certifications: Substitute parts carry expanded approval certifications (CE, CSA, UL) compared to the main part (CSA, UL). All substitutes are ROHS3 compliant, whereas the main part is RoHS non-compliant.

Operating Temperature Range: Substitute parts specify -55°C ~ 125°C operating temperature; the main part does not specify this parameter.

DC Cold Resistance: Substitute parts measure 24.7 Ohms versus 24.5 Ohms for the main part. This 0.2 Ohm variance is within normal manufacturing tolerance for this component class.

Selection among the three substitutes may be based on packaging preference (all listed as Bulk) and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can 0318.062HXP, 0318.062MXP, or 0318.062VXP be used as direct replacements for 0318.062H?

A: Yes. All three parts are electrically and mechanically equivalent. They share identical current rating (62 mA), voltage rating (250 V AC), fuse type (cartridge, glass), response time (fast blow), package format (3AB, 3AG), breaking capacity (35 A), melting I²t (0.000249), and physical dimensions (0.275" Dia x 1.288" L).

Q: What is the difference between the main part and the substitutes?

A: The primary differences are product status (main part is obsolete; substitutes are active), regulatory compliance (substitutes include CE certification and ROHS3 compliance), and specified operating temperature range (-55°C ~ 125°C for substitutes). DC cold resistance differs by 0.2 Ohms, which is within normal manufacturing tolerance.

Q: Are there any compatibility concerns with the 3AB/3AG package format?

A: No. All parts use identical 3AB, 3AG package specifications with 1/4" x 1-1/4" (Axial) dimensions and through-hole mounting. Physical and electrical compatibility is assured.

Q: Which substitute should be selected if all three are available?

A: Selection may be based on inventory availability and packaging preference. All three parts are functionally equivalent. The 0318.062MXP has the highest inventory level (1058 Pcs), followed by 0318.062HXP (755 Pcs) and 0318.062VXP (689 Pcs).

Q: Does the 0.2 Ohm difference in DC cold resistance affect circuit performance?

A: The DC cold resistance variance (24.5 Ohms main part versus 24.7 Ohms substitutes) is within normal manufacturing tolerance for this fuse type and does not affect functional performance in standard circuit applications.

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