Equivalent & Substitute Parts for 3AB 1-R Ceramic Fuse

Part Overview

The 3AB 1-R is a 1 A, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. This fast-blow fuse is designed for applications requiring reliable overcurrent protection in AC circuits. The part is actively produced and widely stocked, with 1,627 units available in inventory. Substitute parts are identified to provide alternative sourcing options when the primary manufacturer part is unavailable or when design flexibility permits equivalent component selection.

Substiute Parts

3AB 1-R

Bel Fuse Inc.In Stock: 17003AB 1-R Datasheet

Current PartRFQ

0314001.MXP

Littelfuse Inc.In Stock: 19970314001.MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3AB 1-R is determined by the following critical parameters:

• Current Rating: Must be 1 A
• Voltage Rating - AC: Must be 250 V minimum
• Fuse Type: Must be Cartridge, Ceramic
• Response Time: Must be Fast Blow
• Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4" form factor
• Mounting Type: Must require the same holder configuration

The substitute part 0314001.MXP (Littelfuse Inc., Series 314) meets all critical substitution criteria. It maintains identical current rating, AC voltage rating, fuse type, response time, and physical package dimensions. The part is actively produced and carries equivalent regulatory approvals.

Parameter Comparison

Engineering Selection Recommendations

Both the 3AB 1-R and 0314001.MXP are active production parts with full regulatory compliance. The 3AB 1-R carries CE, CSA, cURus, and PSE approvals. The 0314001.MXP carries CE, CSA, PSE, and UL approvals, providing additional UL certification coverage.

For AC-only applications at 250 V, 1 A, both parts are functionally equivalent. The 0314001.MXP provides additional DC voltage rating (125 V) and higher breaking capacity, which may be advantageous in applications requiring dual AC/DC operation or enhanced fault tolerance. The melting I²t value of 0314001.MXP (0.69) is lower than the 3AB 1-R (1.4), indicating faster thermal response.

Selection should be based on application requirements, regulatory jurisdiction, and inventory availability. Both parts are suitable for direct substitution in standard 3AB/3AG holder configurations.

Frequently Asked Questions (FAQ)

Q: Can 0314001.MXP be used as a direct replacement for 3AB 1-R?

A: Yes. Both parts share identical current rating (1 A), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (fast blow), and physical package dimensions (3AB, 3AG, 1/4" x 1-1/4"). Both are active production parts with equivalent regulatory approvals for AC applications.

Q: What is the difference in breaking capacity between these parts?

A: The 3AB 1-R has a breaking capacity of 35 A at rated voltage. The 0314001.MXP has a breaking capacity of 100 A AC and 10 kA DC at rated voltage. Higher breaking capacity indicates greater fault tolerance in high-fault-current environments.

Q: Does the DC voltage rating on 0314001.MXP affect AC-only applications?

A: No. The DC voltage rating (125 V) on 0314001.MXP is an additional capability that does not impact AC circuit performance. For AC-only applications, this parameter is not relevant to substitution compatibility.

Q: Are there dimensional differences between these parts?

A: Nominal dimensions are nearly identical. The 3AB 1-R measures 0.250" Dia x 1.252" L (6.35mm x 31.80mm). The 0314001.MXP measures 0.250" Dia x 1.250" L (6.35mm x 31.75mm). The 0.002" (0.05mm) length difference is within standard manufacturing tolerance and does not affect holder compatibility.

Q: Which regulatory approvals should I consider for my application?

A: The 3AB 1-R carries CE, CSA, cURus, and PSE approvals. The 0314001.MXP carries CE, CSA, PSE, and UL approvals. Select the part whose approval set matches your target market and regulatory requirements.

Q: What does the melting I²t value indicate?

A: Melting I²t is a thermal energy parameter that characterizes fuse response speed. The 0314001.MXP (0.69) has a lower value than the 3AB 1-R (1.4), indicating faster thermal response to overcurrent conditions. Both are fast-blow fuses suitable for standard circuit protection applications.