3AG 100-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3AG 100-R is a 100 mA, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. This component is classified as obsolete, necessitating identification of active equivalent alternatives for continued system support and procurement. The fuse is designed for applications requiring fast-blow response characteristics and operates within the temperature range of -55°C to 125°C. Substitute parts must maintain identical electrical ratings and mechanical compatibility with the 3AB and 3AG holder standards.

Substiute Parts

3AG 100-R

Bel Fuse Inc.In Stock: 6473AG 100-R Datasheet

Current PartRFQ

0312.100MXP

Littelfuse Inc.In Stock: 25120312.100MXP Datasheet

DirectRFQ

0312.100HXP

Littelfuse Inc.In Stock: 11290312.100HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3AG 100-R are qualified based on the following electrical and mechanical parameters:

• Current Rating: 100 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" (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The following Littelfuse Inc. parts meet all substitution criteria:

• 0312.100MXP (Direct Manufacturer Substitute)
• 0312.100HXP (Similar Manufacturer Substitute)

Parameter Comparison

Engineering Selection Recommendations

Both 0312.100MXP and 0312.100HXP are active products manufactured by Littelfuse Inc. and are suitable replacements for the obsolete 3AG 100-R. Both substitute parts maintain compliance with CE, CSA, and UL certifications and are ROHS3 compliant. The dimensional variance of 0.002" in length between the original part and substitutes is within acceptable mechanical tolerance for 3AB and 3AG holder compatibility. Selection between the two Littelfuse alternatives should be based on procurement availability and packaging requirements (both available in bulk packaging).

Frequently Asked Questions (FAQ)

Q: Can 0312.100MXP and 0312.100HXP be used interchangeably with the 3AG 100-R?

A: Both Littelfuse parts are electrically and mechanically equivalent to the 3AG 100-R. They share identical current ratings, voltage ratings, response characteristics, and holder compatibility. Both are suitable for direct substitution.

Q: What is the significance of the dimensional difference (0.002" length variance)?

A: The 3AB and 3AG holder standards accommodate the dimensional tolerance range present across all qualified fuses. The 0.002" variance between the original part (1.252" L) and substitutes (1.250" L) is within standard mechanical tolerance and does not affect holder compatibility or electrical performance.

Q: Are there differences in breaking capacity between the original and substitute parts?

A: The original 3AG 100-R has a breaking capacity of 200A, while both Littelfuse substitutes have a breaking capacity of 35A. Both values exceed the rated voltage requirement of 250V for this fuse category. Application-specific breaking capacity requirements should be evaluated during component selection.

Q: Do the substitute parts carry the same regulatory approvals?

A: Both 0312.100MXP and 0312.100HXP carry CE, CSA, and UL certifications. The original part carries cULus certification. All three parts are ROHS3 compliant and REACH unaffected.

Q: What is the difference between 0312.100MXP and 0312.100HXP?

A: Both parts are manufactured by Littelfuse Inc. within the 312 series and share identical electrical and mechanical specifications. Selection between them should be based on procurement availability and packaging preferences.