Equivalent & Substitute Parts for 3AB 1.25 Ceramic Fuse

Part Overview

The 3AB 1.25 is a 1.25 A, 250 V AC/DC ceramic cartridge fuse manufactured by Bel Fuse Inc. This fast-blow fuse is designed for applications requiring overcurrent protection in industrial and commercial equipment. The main part (3AB 1.25) carries an obsolete product status, making substitute identification critical for ongoing system maintenance and component procurement. The 3AB 1.25-R provides a direct functional equivalent with active product status and improved compliance characteristics.

Substiute Parts

3AB 1.25

Bel Fuse Inc.In Stock: 9773AB 1.25 Datasheet

Current PartRFQ

3AB 1.25-R

Bel Fuse Inc.In Stock: 19223AB 1.25-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3AB 1.25-R qualifies as a direct substitute for the 3AB 1.25 based on the following critical parameters:

• Current Rating: Identical at 1.25 A
• Voltage Rating: Identical at 250 V AC
• Fuse Type: Identical ceramic cartridge construction
• Response Time: Identical fast-blow characteristic
• Physical Dimensions: Identical 1/4" x 1-1/4" form factor
• Breaking Capacity: Identical 100 A @ rated voltage
• Melting I²t: Identical at 2.45
• Operating Temperature Range: Identical -55°C to 125°C
• DC Cold Resistance: Identical at 0.114 Ohms

The substitution is valid because all electrical and mechanical parameters match exactly, ensuring functional equivalence in any application where the original part was specified.

Parameter Comparison

Engineering Selection Recommendations

The 3AB 1.25-R is the appropriate selection for new designs and component replacement applications. This substitute maintains identical electrical and mechanical specifications while offering the following advantages:

• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance aligns with current environmental and regulatory standards
• Identical approval certifications (CE, CSA, PSE) with addition of cURus certification
• Functionally equivalent performance across all critical parameters

For applications where the original 3AB 1.25 is currently installed, direct replacement with the 3AB 1.25-R requires no circuit modifications or holder changes, as the physical form factor and electrical characteristics are identical.

Frequently Asked Questions (FAQ)

Q: Can the 3AB 1.25-R be used as a direct replacement for the 3AB 1.25?

A: Yes. The 3AB 1.25-R is a direct substitute. All electrical parameters (current rating, voltage rating, response time, breaking capacity, melting I²t, and DC cold resistance) are identical. The physical dimensions and holder requirements are also identical, enabling drop-in replacement without circuit or mounting modifications.

Q: What is the difference between the 3AB 1.25 and 3AB 1.25-R?

A: The primary differences are product status and compliance. The 3AB 1.25 is obsolete and RoHS non-compliant, while the 3AB 1.25-R is active and ROHS3 compliant. Functionally and electrically, both parts are equivalent.

Q: Are there any holder or mounting differences?

A: No. Both parts require the same 3AB or 3AG holder and use identical 1/4" x 1-1/4" form factor dimensions. No mechanical modifications are necessary for substitution.

Q: What certifications apply to the 3AB 1.25-R?

A: The 3AB 1.25-R carries CE, CSA, cURus, and PSE certifications, ensuring compliance with international safety and regulatory standards.

Q: Is the 3AB 1.25-R suitable for new product designs?

A: Yes. The active product status and ROHS3 compliance make the 3AB 1.25-R the appropriate choice for new designs and long-term applications.