Littelfuse 0307004.M Glass Cartridge Fuse 4A 32VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0307004.M is a 4 A, 32 V AC/DC glass cartridge fuse in the 1AG form factor (1/4" x 5/8"). This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and component procurement. The fuse operates with fast-blow response characteristics and requires a compatible holder for installation. Substitute parts must maintain identical electrical ratings and physical dimensions to ensure proper circuit protection without modification to existing fuse holders.

Substiute Parts

0307004.M

Littelfuse Inc.In Stock: 8090307004.M Datasheet

Current PartRFQ

0307004.H

Littelfuse Inc.In Stock: 7270307004.H Datasheet

Parametric EquivalentRFQ

0SFE004.V

Littelfuse Inc.In Stock: 14170SFE004.V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0307004.M are determined by strict equivalence across the following critical parameters:

• Current Rating: 4 A (exact match required)
• Voltage Rating - AC: 32 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 1AG, 1/4" x 5/8" (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

The identified substitute parts maintain all mandatory electrical and mechanical specifications. Substitutes differ in product status (active vs. obsolete), compliance certifications, and DC voltage rating availability, which do not affect functional interchangeability in AC-rated applications.

Parameter Comparison

Engineering Selection Recommendations

Both 0307004.H and 0SFE004.V are functionally equivalent to the obsolete 0307004.M for AC applications at 4 A, 32 V. Selection between these substitutes should be based on the following criteria:

0307004.H is recommended for applications requiring UL approval certification and ROHS3 compliance. This part is actively manufactured and provides explicit DC voltage rating (32 V DC), enabling use in dual AC/DC circuits if required.

0SFE004.V is recommended for applications where UL certification is not a procurement requirement. This part is actively manufactured, ROHS3 compliant, and offers the highest current inventory availability. DC voltage rating is specified at 32 V, matching 0307004.H.

Both substitutes eliminate the obsolescence risk associated with the 0307004.M while maintaining identical electrical protection characteristics and physical form factor compatibility with existing 1AG fuse holders.

Frequently Asked Questions (FAQ)

Q: Can 0307004.H or 0SFE004.V be used as direct replacements for 0307004.M?

A: Yes. Both parts are electrically and mechanically equivalent. They maintain the same 4 A current rating, 32 V AC voltage rating, fast-blow response, and 1AG physical form factor. No modifications to fuse holders or circuit design are required.

Q: What is the difference between 0307004.H and 0SFE004.V?

A: The primary differences are product status (both active), compliance certifications, and inventory availability. 0307004.H carries explicit UL approval, while 0SFE004.V does not specify an approval agency. Both are ROHS3 compliant. 0SFE004.V has higher inventory availability (1335 pcs vs. 646 pcs).

Q: Does the DC voltage rating affect AC circuit applications?

A: No. For AC-only applications, the DC voltage rating is not a functional parameter. Both substitutes are rated for 32 V AC, which is the controlling specification for AC circuits. The DC rating on 0307004.H and 0SFE004.V indicates broader application flexibility but does not change AC performance.

Q: Are these fuses compatible with existing 1AG fuse holders?

A: Yes. All three parts use the 1AG form factor (1/4" x 5/8"), ensuring mechanical compatibility with any holder designed for this standard package.

Q: Why is 0307004.M classified as obsolete?

A: The obsolete status indicates that Littelfuse has discontinued active production and support for this part number. Active equivalents (0307004.H and 0SFE004.V) are available to fulfill the same circuit protection function.