CB61F3A-TR2 Equivalent & Substitute Parts Reference

Part Overview

The CB61F3A-TR2 is a 3 A, 125 V AC/DC surface mount board mount fuse manufactured by Eaton - Electronics Division. This fast blow fuse is designed for circuit protection in surface mount applications with a 2-SMD square end block package. The part is currently active in production with full inventory availability (5120 pcs in stock).

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across different packaging configurations or manufacturer sources. This reference provides engineering-level guidance for component selection based on parametric equivalence.

Substiute Parts

CB61F3A-TR2

Eaton - Electronics DivisionIn Stock: 5204CB61F3A-TR2 Datasheet

Current PartRFQ

CB61F3A-TR1

Eaton - Electronics DivisionIn Stock: 3418CB61F3A-TR1 Datasheet

Parametric EquivalentRFQ

0476003.MR

Littelfuse Inc.In Stock: 21390476003.MR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CB61F3A-TR2 are classified into two categories based on parametric equivalence:

Parametric Equivalent (Same Manufacturer - Packaging Variant): The CB61F3A-TR1 is a direct parametric equivalent manufactured by Eaton - Electronics Division. This substitute maintains identical electrical specifications (3 A, 125 V AC/DC, fast blow response) and mechanical compatibility (2-SMD square end block package). The only difference is the tape & reel packaging configuration (TR1 vs. TR2). This substitution is valid when packaging format does not constrain assembly operations.

Direct Manufacturer Equivalent (Cross-Manufacturer): The 0476003.MR manufactured by Littelfuse Inc. provides functional equivalence with the following parameter alignment:

• Current Rating: 3 A (identical)
• Voltage Rating - AC: 250 V (exceeds 125 V requirement)
• Voltage Rating - DC: 125 V (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Surface Mount (identical)
• Package / Case: 2-SMD, Square End Block (identical)
• Breaking Capacity: 100 A AC, 300 A DC (identical)
• RoHS Status: ROHS3 Compliant (identical)

The 0476003.MR is suitable for applications where the higher AC voltage rating (250 V vs. 125 V) provides additional design margin without circuit modification.

Parameter Comparison

Engineering Selection Recommendations

CB61F3A-TR1 Selection Criteria: The CB61F3A-TR1 is the preferred substitute when packaging format flexibility exists. Both parts are manufactured by Eaton - Electronics Division with identical electrical and mechanical specifications. Selection between TR1 and TR2 variants depends solely on tape & reel packaging requirements for automated assembly processes. Both parts maintain active product status and carry equivalent regulatory certifications (CQC, cULus, PSE).

0476003.MR Selection Criteria: The 0476003.MR is suitable for applications where the elevated AC voltage rating (250 V) provides additional circuit protection margin. This cross-manufacturer substitute maintains identical current rating, DC voltage rating, response time, and breaking capacity. The part carries cURus certification. Physical dimensions show minor variation (0.106" vs. 0.101" width and height), which must be verified against PCB footprint constraints before implementation. The lower melting I²t value (1.66 vs. 2.08) indicates faster thermal response and should be evaluated against circuit protection timing requirements.

All three parts are ROHS3 compliant with MSL 1 rating, suitable for standard reflow assembly processes without moisture precautions.

Frequently Asked Questions (FAQ)

Q: Can CB61F3A-TR1 be used as a direct replacement for CB61F3A-TR2?

A: Yes. Both parts are manufactured by Eaton - Electronics Division with identical electrical specifications (3 A, 125 V AC/DC, fast blow) and mechanical compatibility (2-SMD square end block). The difference is packaging format (TR1 vs. TR2 tape & reel configuration). Substitution is valid when packaging does not constrain assembly operations.

Q: What are the key differences between CB61F3A-TR2 and 0476003.MR?

A: The primary electrical difference is AC voltage rating: 0476003.MR is rated 250 V AC versus 125 V AC for CB61F3A-TR2. DC voltage rating (125 V), current rating (3 A), and response time (fast blow) are identical. Physical dimensions show minor variation: 0476003.MR is 0.106" W x 0.106" H versus 0.101" W x 0.101" H for CB61F3A-TR2. Melting I²t differs (1.66 vs. 2.08), indicating faster thermal response in the Littelfuse part.

Q: Is the 0476003.MR suitable for 125 V AC applications?

A: Yes. The 0476003.MR is rated 250 V AC, which exceeds the 125 V AC requirement. A higher voltage rating does not prevent operation at lower voltages. The part is suitable for 125 V AC circuits and provides additional design margin.

Q: Are there dimensional compatibility concerns with 0476003.MR?

A: The 0476003.MR has slightly larger width and height dimensions (0.106" vs. 0.101"). PCB footprint and solder pad spacing must be verified before implementation to ensure mechanical fit and reflow compatibility.

Q: Do all three parts have equivalent regulatory certifications?

A: CB61F3A-TR2 and CB61F3A-TR1 carry identical certifications (CQC, cULus, PSE). The 0476003.MR carries cURus certification. Application-specific regulatory requirements must be verified to confirm certification adequacy.

Q: What is the significance of the different melting I²t values?

A: Melting I²t (2.08 for Eaton parts vs. 1.66 for Littelfuse) indicates thermal response speed. The lower value in 0476003.MR represents faster thermal response. Circuit protection timing and thermal stress requirements must be evaluated to confirm suitability for the application.

Q: Can these parts be used interchangeably in automated assembly?

A: CB61F3A-TR2 and CB61F3A-TR1 are interchangeable from an assembly perspective, with packaging format as the only variable. The 0476003.MR requires verification of PCB footprint compatibility due to minor dimensional differences before automated placement.