CB61F6-3A-TR1 Equivalent & Substitute Parts Reference

Part Overview

The CB61F6-3A-TR1 is a 6.3 A surface mount board mount fuse manufactured by Eaton - Electronics Division, rated for 125 V AC and 125 V DC operation. This fast blow fuse is designed for SMD applications in 2-SMD square end block package configuration. The part is currently active in production with 1854 pieces available in inventory. Equivalent and substitute parts are identified when electrical ratings, mechanical dimensions, and functional characteristics align within specified tolerances, enabling direct replacement in circuit protection applications without design modification.

Key Parameters

Parameter	Value
Current Rating	6.3 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
Size / Dimension	0.240" L x 0.101" W x 0.101" H (6.10mm x 2.57mm x 2.57mm)
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CB61F6-3A-TR1 is determined by strict alignment of the following parameters:

Critical Matching Parameters:

Current Rating: 6.3 A
Voltage Rating - AC: 125 V
Voltage Rating - DC: 125 V
Response Time: Fast Blow
Mounting Type: Surface Mount
Package / Case: 2-SMD, Square End Block
Fuse Type: Board Mount (Cartridge Style Excluded)

Acceptable Variation Parameters:

Size / Dimension: Tolerance within 0.006" (0.15mm) per axis
DC Cold Resistance: Tolerance within ±0.002 Ohms
Melting I²t: Tolerance within ±4.2 (32% variance)
Breaking Capacity: May vary based on manufacturer design
Operating Temperature Range: Extended range acceptable if minimum meets -0°C requirement
Approval Agencies: Subset or superset of original certifications acceptable

Three substitute parts meet these criteria and are grouped as direct equivalents.

Parameter Comparison

Parameter	CB61F6-3A-TR1 (Eaton)	CB61F6-3A-TR2 (Eaton)	045106.3MRL (Littelfuse)	047606.3MRSN (Littelfuse)
Manufacturer	Eaton - Electronics Division	Eaton - Electronics Division	Littelfuse	Littelfuse Inc.
Current Rating (Amps)	6.3 A	6.3 A	6.3 A	6.3 A
Voltage Rating - AC	125 V	125 V	125 V	125 V
Voltage Rating - DC	125 V	125 V	125 V	125 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block
Size / Dimension (L x W x H)	0.240" x 0.101" x 0.101" (6.10mm x 2.57mm x 2.57mm)	0.240" x 0.101" x 0.101" (6.10mm x 2.57mm x 2.57mm)	0.240" x 0.106" x 0.106" (6.10mm x 2.69mm x 2.69mm)	0.240" x 0.106" x 0.106" (6.10mm x 2.69mm x 2.69mm)
DC Cold Resistance (Ohms)	0.01	0.01	0.0096	0.0126
Melting I²t	13.7	13.7	9.17	7.5
Breaking Capacity @ Rated Voltage	100A AC, 300A DC	100A AC, 300A DC	50A	100A AC, 300A DC
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active
Approval Agency	CQC, cULus, PSE	CQC, cULus, PSE	CSA, PSE, UL	cURus
Operating Temperature Range	Not specified	Not specified	-55°C ~ 125°C	-55°C ~ 125°C
Inventory (Pcs)	1854	10091	15100	2278

Engineering Selection Recommendations

CB61F6-3A-TR2 (Eaton - Electronics Division)

This part is a parametric equivalent manufactured by the same supplier as the primary part. All electrical ratings, mechanical dimensions, and functional characteristics are identical to CB61F6-3A-TR1. The only difference is packaging designation (TR2 versus TR1), which reflects tape and reel configuration variants. This substitute is suitable for direct replacement with no circuit design changes required. Inventory availability is significantly higher at 10091 pieces. Approval agencies and compliance certifications are identical.

045106.3MRL (Littelfuse - NANO²® 451 Series)

This part meets all critical electrical parameters and mounting requirements. Width and height dimensions are 0.005" (0.12mm) larger per axis, remaining within acceptable mechanical tolerance for SMD footprint compatibility. DC cold resistance is 0.0096 Ohms, within 0.002 Ohms tolerance. Melting I²t of 9.17 represents 33% reduction from primary part, indicating faster thermal response. Breaking capacity is 50A AC, lower than the primary part's 100A AC specification. Operating temperature range of -55°C to 125°C exceeds primary part specification. Approval agencies include UL and PSE certifications. ROHS3 compliance exceeds RoHS requirement. This substitute is suitable for applications where lower breaking capacity is acceptable and extended temperature operation is beneficial.

047606.3MRSN (Littelfuse - NANO²® 476 Series)

This part matches all critical electrical parameters and mounting requirements. Width and height dimensions are 0.005" (0.12mm) larger per axis, within acceptable mechanical tolerance. DC cold resistance of 0.0126 Ohms is within 0.002 Ohms tolerance. Melting I²t of 7.5 represents 45% reduction from primary part, indicating significantly faster thermal response. Breaking capacity matches primary part at 100A AC and 300A DC. Operating temperature range of -55°C to 125°C exceeds primary part specification. Approval agency is cURus. ROHS3 compliance exceeds RoHS requirement. This substitute is suitable for applications requiring faster fuse response and extended temperature operation.

Frequently Asked Questions (FAQ)

Q: Can CB61F6-3A-TR2 be used as a direct replacement for CB61F6-3A-TR1?

A: Yes. CB61F6-3A-TR2 is manufactured by Eaton and shares identical electrical ratings (6.3 A, 125 V AC/DC), response time (fast blow), mounting type (surface mount), and package configuration (2-SMD square end block). The TR designation difference refers only to tape and reel packaging variants. No circuit design changes are required.

Q: What is the difference between Littelfuse 045106.3MRL and 047606.3MRSN?

A: Both parts meet the 6.3 A, 125 V AC/DC electrical requirements and surface mount package specifications. The primary differences are melting I²t values (9.17 versus 7.5) and breaking capacity (50A AC versus 100A AC). The 047606.3MRSN provides faster thermal response and higher breaking capacity. Selection depends on circuit protection requirements.

Q: Are the dimensional differences between Eaton and Littelfuse parts significant?

A: Littelfuse parts (045106.3MRL and 047606.3MRSN) are 0.005" (0.12mm) larger in width and height compared to Eaton parts. This variation remains within standard SMD footprint tolerances and does not prevent PCB placement compatibility. Verify footprint design margins if space constraints exist.

Q: Do all substitute parts have the same approval certifications?

A: No. CB61F6-3A-TR1 and CB61F6-3A-TR2 share CQC, cULus, and PSE certifications. Littelfuse 045106.3MRL carries CSA, PSE, and UL certifications. Littelfuse 047606.3MRSN carries cURus certification. Verify that the substitute part's approval agencies meet your application requirements.

Q: Can I use 045106.3MRL if my circuit requires 100A AC breaking capacity?

A: No. The 045106.3MRL has a 50A AC breaking capacity, which is insufficient for applications requiring 100A AC protection. Use 047606.3MRSN or CB61F6-3A-TR1/TR2 for 100A AC breaking capacity.

Q: What does the difference in melting I²t mean for circuit protection?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower I²t values (7.5 for 047606.3MRSN, 9.17 for 045106.3MRL) result in faster fuse response to overcurrent conditions compared to higher values (13.7 for Eaton parts). Select based on circuit protection speed requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. CB61F6-3A-TR1 and CB61F6-3A-TR2 are RoHS Compliant. Littelfuse parts 045106.3MRL and 047606.3MRSN are ROHS3 Compliant, which exceeds the RoHS requirement.

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