UMTS 6.3 Equivalent & Substitute Parts

Part Overview

The UMTS 6.3 is a 6.3 A 250 V AC surface mount board fuse manufactured by Bel Fuse Inc. in a 2-SMD square end block package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The fuse provides slow blow response characteristics suitable for board-level protection in electrical and industrial applications.

Substiute Parts

UMTS 6.3

Bel Fuse Inc.In Stock: 1236UMTS 6.3 Datasheet

Current PartRFQ

0683G6300-01

Bel Fuse Inc.In Stock: 23020683G6300-01 Datasheet

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0683G6300-11

Bel Fuse Inc.In Stock: 10140683G6300-11 Datasheet

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TR-1245UMFT6-3-R

Eaton - Electronics DivisionIn Stock: 3661TR-1245UMFT6-3-R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the UMTS 6.3 is determined by the following critical parameters:

• Current Rating: 6.3 A (exact match required)
• Voltage Rating - AC: 250 V minimum
• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block (physical compatibility)
• Response Time: Slow Blow
• Operating Temperature Range: -55°C ~ 125°C minimum

Substitute parts must maintain identical current ratings and surface mount package geometry to ensure PCB compatibility. Voltage ratings may exceed the original specification without compromising functionality. Parts requiring external holders or featuring different package styles are excluded from direct substitution.

Parameter Comparison

Engineering Selection Recommendations

0683G6300-01 (Bel Fuse Inc.) is a direct functional substitute with identical current rating, package geometry, and mounting type. This part features elevated AC voltage rating (350 V) and DC voltage capability (125 V), providing enhanced voltage margin. Product status is active with full availability. RoHS3 compliance and CE/cURus certifications align with the original specification.

TR-1245UMFT6-3-R (Eaton - Electronics Division) maintains identical current rating, package configuration, and AC voltage rating (250 V). This part is active and widely available. Operating temperature range extends to -40°C minimum (versus -55°C for the original), which is acceptable for most industrial applications. RoHS3 compliance is confirmed. Breaking capacity is rated at 100A, which is lower than the original 150A specification but remains within acceptable limits for board-level protection.

0683G6300-11 is excluded from direct substitution due to cartridge mounting type requiring an external holder, which is incompatible with the original surface mount PCB footprint.

Frequently Asked Questions (FAQ)

Q: Can 0683G6300-01 be used as a direct replacement for UMTS 6.3?

A: Yes. Both parts share identical current rating (6.3 A), surface mount package geometry (2-SMD square end block), and slow blow response. The elevated voltage rating (350 V AC) does not compromise functionality in 250 V AC circuits.

Q: What is the difference between 0683G6300-01 and 0683G6300-11?

A: 0683G6300-01 is a surface mount ceramic fuse in 2-SMD package. 0683G6300-11 is a cartridge-style fuse requiring an external holder and is not compatible with the original PCB footprint.

Q: Is TR-1245UMFT6-3-R suitable for applications requiring -55°C operation?

A: TR-1245UMFT6-3-R is rated to -40°C minimum. For applications requiring -55°C operation, 0683G6300-01 or the original UMTS 6.3 specification should be used.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both 0683G6300-01 and TR-1245UMFT6-3-R are RoHS3 compliant, matching the original specification.

Q: What is the impact of different breaking capacities?

A: UMTS 6.3 has 150A breaking capacity. TR-1245UMFT6-3-R has 100A, and 0683G6300-01 has 100A AC / 2kA DC. Breaking capacity defines the maximum fault current the fuse can safely interrupt. Lower breaking capacity may be acceptable depending on circuit design and fault current calculations. Engineering review is required for applications with high fault current potential.

Q: Can these parts be used interchangeably on existing PCBs?

A: Yes, provided the PCB footprint accommodates the 2-SMD square end block package. Physical dimensions are equivalent across all three parts (approximately 12.10mm L x 4.45-4.50mm W x 4.45-4.50mm H).