3AP 1.6-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3AP 1.6-R is a 1.6 A 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG form factor (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing circuit protection applications requiring identical electrical and mechanical specifications.

Substiute Parts

3AP 1.6-R

Bel Fuse Inc.In Stock: 10653AP 1.6-R Datasheet

Current PartRFQ

031801.6HXP

Littelfuse Inc.In Stock: 1115031801.6HXP Datasheet

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031801.6MXP

Littelfuse Inc.In Stock: 756031801.6MXP Datasheet

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031801.6VXP

Littelfuse Inc.In Stock: 802031801.6VXP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3AP 1.6-R are qualified based on the following critical parameters:

• Current Rating: 1.6 A (exact match required)
• Voltage Rating: 250 V AC (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)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

All three substitute parts from Littelfuse Inc. (031801.6HXP, 031801.6MXP, 031801.6VXP) meet these criteria and are classified as active products, providing direct functional equivalence to the obsolete 3AP 1.6-R.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (031801.6HXP, 031801.6MXP, 031801.6VXP) provide direct functional equivalence to the 3AP 1.6-R. Selection among these three active alternatives is based on:

• Product Status: All substitutes are active products with current manufacturing support, eliminating obsolescence risk associated with the original 3AP 1.6-R.
• Regulatory Compliance: Littelfuse substitutes carry expanded approval certifications (CE, CSA, KC, PSE, UL) compared to the original part (CE, CSA, cULus), providing broader regulatory coverage.
• Availability: All three substitutes maintain active inventory levels (691–1078 pieces), ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 031801.6HXP, 031801.6MXP, or 031801.6VXP be used as direct replacements for the 3AP 1.6-R?

A: Yes. All three Littelfuse parts are direct functional equivalents. They share identical current ratings (1.6 A), voltage ratings (250 V AC), fuse type (cartridge, glass), response time (fast blow), package dimensions (3AB/3AG, 1/4" x 1-1/4"), and operating temperature range (-55°C ~ 125°C).

Q: What is the difference between the three Littelfuse substitute parts?

A: The 031801.6HXP, 031801.6MXP, and 031801.6VXP are electrically and mechanically identical. Differences are limited to internal design variants (indicated by the suffix letters H, M, V) that do not affect circuit protection performance or compatibility.

Q: Are there any dimensional differences between the 3AP 1.6-R and the Littelfuse substitutes?

A: Dimensional differences are negligible. The 3AP 1.6-R measures 0.272" Dia x 1.280" L (6.90mm x 32.50mm), while Littelfuse substitutes measure 0.275" Dia x 1.288" L (6.99mm x 32.72mm). These variations fall within standard manufacturing tolerances for the 3AB/3AG form factor and do not affect mechanical fit in standard fuse holders.

Q: Do the substitute parts meet the same regulatory standards?

A: The Littelfuse substitutes meet or exceed the regulatory requirements of the original part. While the 3AP 1.6-R carries CE, CSA, and cULus approvals, the Littelfuse alternatives carry CE, CSA, KC, PSE, and UL approvals, providing broader international compliance coverage.

Q: Is the breaking capacity difference significant?

A: The 3AP 1.6-R has a breaking capacity of 200 A at rated voltage, while Littelfuse substitutes have 100 A. For standard circuit protection applications operating within normal current limits, this difference does not affect performance. Applications requiring the higher breaking capacity specification should be evaluated separately.