Littelfuse 0311007.H Equivalent & Substitute Parts

Part Overview

The Littelfuse 0311007.H is a 7A 32VAC fast-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4"). This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system maintenance and component procurement. The part requires a compatible fuse holder for installation and is approved by CSA and UL standards.

Substiute Parts

0311007.H

Littelfuse Inc.In Stock: 9500311007.H Datasheet

Current PartRFQ

0312007.HXP

Littelfuse Inc.In Stock: 11190312007.HXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0311007.H is determined by the following critical parameters that must remain constant or be compatible:

Fixed Parameters (Must Match):

• Current Rating: 7 A
• Fuse Type: Cartridge, Glass
• Response Time: Fast Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Physical Dimensions: 0.250" Dia x 1.250" L

Allowable Variation Parameters:

• Voltage Rating: The substitute may have a higher voltage rating than the original 32V, provided the fuse holder and circuit design accommodate this rating
• Approval Certifications: Substitute must maintain equivalent or superior safety certifications
• RoHS Compliance: Newer substitutes may have improved compliance status

The Littelfuse 0312007.HXP qualifies as a direct substitute because it maintains identical current rating, fuse type, response time, and physical package specifications while offering enhanced voltage capability (250V) and improved regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The 0312007.HXP is the appropriate substitute for the obsolete 0311007.H based on the following engineering criteria:

Product Status Alignment: The substitute is active and currently manufactured, ensuring long-term availability and supply chain continuity for replacement and new installations.

Electrical Compatibility: Both fuses maintain identical 7A current ratings and fast-blow response characteristics. The 0312007.HXP's higher 250V AC rating is compatible with the original 32V application, as a higher-rated component functions safely in lower-voltage circuits.

Physical Compatibility: Identical package dimensions (3AB, 3AG, 1/4" x 1-1/4") ensure direct mechanical fit in existing fuse holders without modification.

Regulatory Compliance: The substitute carries expanded certifications (CE, CSA, KC, PSE, UL) compared to the original (CSA, UL), providing broader international compliance. The ROHS3 compliance status of the substitute represents improved environmental and regulatory alignment with current manufacturing standards.

Performance Specifications: The substitute provides documented breaking capacity (200A) and melting I²t (118), offering enhanced electrical characterization for circuit protection analysis.

Frequently Asked Questions (FAQ)

Q: Can the 0312007.HXP be used directly in place of the 0311007.H without modifications?

A: Yes. Both fuses share identical current ratings (7A), response times (fast-blow), and physical dimensions (0.250" Dia x 1.250" L). They use the same 3AB/3AG package format and fit standard fuse holders designed for this specification. No holder modifications are required.

Q: Why does the substitute have a higher voltage rating (250V vs. 32V)?

A: The 0312007.HXP is rated for 250V AC, while the original is rated for 32V AC. A fuse with a higher voltage rating is suitable for lower-voltage applications. The substitute will function correctly in 32V circuits. Voltage rating indicates the maximum voltage the fuse can safely interrupt; using a higher-rated fuse in a lower-voltage application does not create a safety concern.

Q: Are there any compatibility issues with the fuse holder?

A: No. Both fuses use the identical 3AB/3AG package specification and physical dimensions. Any fuse holder designed for 3AB or 3AG cartridge fuses will accommodate both the original and substitute without modification.

Q: What is the significance of the RoHS compliance difference?

A: The original 0311007.H is RoHS non-compliant, while the substitute 0312007.HXP is ROHS3 compliant. This indicates the substitute meets current environmental and hazardous substance restrictions. For new designs or systems requiring RoHS compliance, the substitute is the appropriate choice.

Q: Does the substitute provide better electrical protection?

A: Both fuses provide identical 7A fast-blow protection. The substitute offers documented breaking capacity (200A) and melting I²t (118), providing more complete electrical characterization. The protection function remains equivalent; the additional specifications enable more detailed circuit analysis.

Q: Is the substitute available in the same packaging as the original?

A: The substitute is available in bulk packaging, while the original inventory status is listed as new original stock. For procurement purposes, the 0312007.HXP is currently in active production with 1052 pieces available in stock.