CB61F7A-TR2 Equivalent & Substitute Parts Reference

Part Overview

The CB61F7A-TR2 is a 7 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 applications requiring 2-SMD, square end block packaging. The part is currently active in production with 5043 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to component availability, supply chain considerations, or design flexibility within the same functional specification.

Substiute Parts

CB61F7A-TR2

Eaton - Electronics DivisionIn Stock: 5077CB61F7A-TR2 Datasheet

Current PartRFQ

CB61F7A-TR1

Eaton - Electronics DivisionIn Stock: 1701CB61F7A-TR1 Datasheet

Parametric EquivalentRFQ

0476007.MR

Littelfuse Inc.In Stock: 25460476007.MR Datasheet

DirectRFQ

0476007.MRSN

Littelfuse Inc.In Stock: 8100476007.MRSN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CB61F7A-TR2 is determined by strict equivalence across the following parameters:

Mandatory Equivalence Parameters:

• Current Rating: 7 A
• Voltage Rating - AC: 125 V
• Voltage Rating - DC: 125 V
• Response Time: Fast Blow
• Mounting Type: Surface Mount
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Package / Case: 2-SMD, Square End Block
• Breaking Capacity @ Rated Voltage: 100 A AC, 300 A DC

All identified substitute parts meet these mandatory parameters. Variations in secondary parameters such as melting I²t, DC cold resistance, operating temperature range, and approval agency certifications are noted but do not disqualify substitution when the primary electrical and mechanical specifications are identical.

Parameter Comparison

Engineering Selection Recommendations

Eaton CB61F7A-TR1: This part is a parametric equivalent to the CB61F7A-TR2, differing only in packaging designation (TR1 versus TR2). Both parts are manufactured by Eaton - Electronics Division and carry identical electrical specifications, approval certifications (cULus, PSE), and RoHS3 compliance. Selection between CB61F7A-TR2 and CB61F7A-TR1 is based on packaging tape configuration and supply availability.

Littelfuse 0476007.MR and 0476007.MRSN: These parts are direct functional equivalents from Littelfuse Inc., part of the NANO²®476 series. Both meet all mandatory electrical and mechanical parameters. The primary differences are:

• Melting I²t: 7.8 (versus 15.6 for Eaton parts)
• DC Cold Resistance: 0.0116 Ohms (versus 0.009 Ohms for Eaton parts)
• Operating Temperature: -55°C ~ 125°C (specified, versus unspecified for Eaton parts)
• Approval Agency: cURus (versus cULus, PSE for Eaton parts)
• REACH Status: 0476007.MR is REACH Affected; 0476007.MRSN is REACH Unaffected

Selection of Littelfuse alternatives is appropriate when Littelfuse supply chain preference, cURus certification, or REACH compliance status aligns with application requirements. The difference in melting I²t and DC cold resistance does not affect substitution eligibility within the specified 7 A, 125 V AC/DC circuit protection function.

Frequently Asked Questions (FAQ)

Q: Can CB61F7A-TR1 be used as a direct replacement for CB61F7A-TR2?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and are parametrically identical across all electrical and mechanical specifications. The TR1 and TR2 designations refer to tape configuration in the Tape & Reel packaging. Selection depends on equipment compatibility with the specific tape format and supply availability.

Q: Are Littelfuse 0476007.MR and 0476007.MRSN interchangeable with the Eaton CB61F7A-TR2?

A: Yes, for circuit protection function. Both Littelfuse parts meet the mandatory electrical specifications: 7 A current rating, 125 V AC/DC voltage rating, fast blow response, and 100 A AC / 300 A DC breaking capacity. Physical dimensions are equivalent within tolerance (0.240" L x 0.106" W x 0.106" H for Littelfuse versus 0.240" L x 0.101" W x 0.101" H for Eaton). Approval certifications differ (cURus for Littelfuse versus cULus, PSE for Eaton), so application certification requirements must be verified.

Q: What is the difference between 0476007.MR and 0476007.MRSN?

A: Both parts are electrically and mechanically identical. The primary difference is REACH compliance status: 0476007.MR is REACH Affected, while 0476007.MRSN is REACH Unaffected. Selection depends on regulatory requirements for the end application and geographic market.

Q: Why do Littelfuse parts have different melting I²t and DC cold resistance values?

A: Melting I²t and DC cold resistance are secondary parameters that reflect manufacturing process differences between manufacturers. These variations do not affect the primary circuit protection function at the specified 7 A rating and 125 V voltage. Both Eaton and Littelfuse parts provide equivalent protection performance within the defined electrical specifications.

Q: Can these fuses be used in applications requiring -55°C to 125°C operating temperature?

A: Littelfuse 0476007.MR and 0476007.MRSN are specified for -55°C ~ 125°C operation. Eaton CB61F7A-TR2 and CB61F7A-TR1 do not specify an operating temperature range. For applications requiring confirmed operation across the full -55°C to 125°C range, Littelfuse parts provide explicit temperature rating documentation.

Q: What packaging format is used for these parts?

A: All four parts are supplied in Tape & Reel (TR) format for automated assembly. The tape configuration may differ between TR1 and TR2 designations for Eaton parts. Littelfuse parts use standard Tape & Reel packaging compatible with industry-standard pick-and-place equipment.