Littelfuse 0318.600H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318.600H is a 600 mA, 250 V AC/DC fast-blow glass cartridge fuse in the 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 manufacturer equivalents from Littelfuse Inc. are available in active product status with enhanced compliance certifications.

Substiute Parts

0318.600H

Littelfuse Inc.In Stock: 11330318.600H Datasheet

Current PartRFQ

0318.600HXP

Littelfuse Inc.In Stock: 11250318.600HXP Datasheet

DirectRFQ

0318.600MXP

Littelfuse Inc.In Stock: 7700318.600MXP Datasheet

Parametric EquivalentRFQ

0318.600VXP

Littelfuse Inc.In Stock: 10630318.600VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0318.600H are classified as direct manufacturer equivalents from Littelfuse Inc. Substitution is based on strict electrical and mechanical parameter matching:

Key Parameters for Substitution:

• Current Rating: 600 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (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 @ Rated Voltage: 35A (exact match required)
• Melting I²t: 0.88 (exact match required)
• Size / Dimension: 0.275" Dia x 1.288" L (6.99mm x 32.72mm) (exact match required)

All substitute parts (0318.600HXP, 0318.600MXP, 0318.600VXP) meet these criteria and are functionally interchangeable with the original 0318.600H component.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (0318.600HXP, 0318.600MXP, 0318.600VXP) are direct functional equivalents of the obsolete 0318.600H. Selection among these active alternatives is based on the following factors:

Product Status: The 0318.600H is obsolete. All substitute parts are in active production status, ensuring long-term availability and supply chain continuity.

Compliance Certifications: The substitute parts carry expanded approval certifications (CE, CSA, UL) compared to the original part (CSA, UL), providing broader regulatory acceptance across markets.

RoHS Compliance: The substitute parts are ROHS3 compliant, whereas the original 0318.600H is RoHS non-compliant. This is significant for applications subject to RoHS regulations.

Operating Temperature Range: Substitute parts specify an operating temperature range of -55°C ~ 125°C, providing defined thermal performance parameters absent from the original part specification.

Electrical Performance: DC cold resistance values for substitute parts (0.362 Ohms) are negligibly higher than the original (0.36 Ohms), representing a 0.56% variance within acceptable engineering tolerance for this component class.

Inventory Availability: All substitute parts maintain adequate stock levels (694–1034 units), supporting immediate procurement requirements.

Frequently Asked Questions (FAQ)

Q: Are the substitute parts 0318.600HXP, 0318.600MXP, and 0318.600VXP electrically identical to the 0318.600H?

A: Yes. All substitute parts match the original part across all critical electrical parameters: 600 mA current rating, 250 V AC voltage rating, 35A breaking capacity, 0.88 melting I²t, and fast-blow response time. DC cold resistance variance (0.362 Ohms vs. 0.36 Ohms) is negligible for circuit protection applications.

Q: Can I use these substitute parts as direct drop-in replacements?

A: Yes. The substitute parts are mechanically and electrically identical to the 0318.600H. They use the same 3AB, 3AG package format with identical dimensions (0.275" Dia x 1.288" L), mounting type (Through Hole), and footprint. No circuit modifications or holder changes are required.

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

A: The part numbers 0318.600HXP, 0318.600MXP, and 0318.600VXP are functionally equivalent. Differences are limited to packaging designation (all listed as Bulk) and internal manufacturing variants. All three meet identical electrical and mechanical specifications.

Q: Why is the original 0318.600H marked as obsolete?

A: The 0318.600H has been superseded by active production equivalents. The substitute parts offer improved compliance certifications (CE addition), RoHS3 compliance, and defined operating temperature ranges, making them preferred for new designs and ongoing maintenance.

Q: Are the substitute parts RoHS compliant?

A: Yes. All substitute parts (0318.600HXP, 0318.600MXP, 0318.600VXP) are ROHS3 compliant. The original 0318.600H is RoHS non-compliant. This is relevant for applications subject to RoHS regulations in the EU and other jurisdictions.

Q: What is the operating temperature range for these fuses?

A: The substitute parts operate across -55°C to 125°C. The original 0318.600H does not specify an operating temperature range in available documentation.

Q: Do these fuses carry international certifications?

A: Yes. All substitute parts carry CE, CSA, and UL certifications. The original 0318.600H carries CSA and UL certifications only. The addition of CE certification on substitute parts supports broader international market acceptance.