UMTS 3.15 Equivalent & Substitute Parts

Part Overview

The UMTS 3.15 is a 3.15 A 250 V AC/DC surface mount board fuse manufactured by Bel Fuse Inc. in a 2-SMD square end block package. This part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning. Substitute parts must maintain electrical compatibility across current rating, voltage specifications, and thermal response characteristics while accommodating modern active product availability.

Substiute Parts

UMTS 3.15

Bel Fuse Inc.In Stock: 1019UMTS 3.15 Datasheet

Current PartRFQ

0683G3150-01

Bel Fuse Inc.In Stock: 36640683G3150-01 Datasheet

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0683G3150-11

Bel Fuse Inc.In Stock: 8020683G3150-11 Datasheet

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TR-1245UMFT3-15-R

Eaton - Electronics DivisionIn Stock: 3827TR-1245UMFT3-15-R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UMTS 3.15 is determined by the following mandatory parameters:

• Current Rating: Must be 3.15 A
• Voltage Rating - AC: Must be rated for minimum 250 V AC
• Response Time: Must be Slow Blow
• Mounting Type: Must be Surface Mount
• Package / Case: Must be 2-SMD, Square End Block
• RoHS Compliance: Must maintain ROHS3 Compliant status

The substitute parts identified below satisfy these core electrical and mechanical requirements. Variations in breaking capacity, melting I²t, and DC cold resistance are permissible within the scope of board-level fuse applications, provided the part maintains the specified current and voltage ratings.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TR-1245UMFT3-15-R (Eaton - Electronics Division)

The TR-1245UMFT3-15-R is the most direct functional equivalent. It maintains identical current rating (3.15 A), voltage rating (250 V AC), response time (Slow Blow), mounting type (Surface Mount), and package configuration (2-SMD, Square End Block). This part is active in production with ROHS3 compliance and cURus approval. The operating temperature range extends to -40°C minimum, which is less stringent than the original -55°C specification but remains suitable for most industrial applications. Melting I²t of 31 provides slightly higher thermal capacity compared to the original 25.

Secondary Substitute: 0683G3150-01 (Bel Fuse Inc.)

The 0683G3150-01 maintains the same manufacturer lineage and identical current rating. It is rated for 350 V AC with 125 V DC capability, exceeding the original 250 V AC specification and providing enhanced voltage margin. Surface mount configuration and 2-SMD square end block package ensure direct PCB compatibility. This part is active in production with ROHS3 compliance and CE/cURus approvals. The lower melting I²t (16.9 versus 25) indicates faster thermal response, which may require circuit validation in applications with marginal inrush current tolerance.

Not Recommended: 0683G3150-11 (Bel Fuse Inc.)

The 0683G3150-11 requires a separate holder cartridge and is classified as "Requires Holder" mounting type, making it incompatible with PCB designs specified for direct surface mount installation. This part does not meet the mandatory package and mounting requirements for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the 0683G3150-01 be used as a direct replacement for the UMTS 3.15?

A: The 0683G3150-01 meets all mandatory electrical and mechanical substitution criteria: 3.15 A current rating, surface mount configuration, 2-SMD square end block package, and slow blow response time. The higher voltage rating (350 V AC versus 250 V AC) provides additional safety margin. However, the lower melting I²t (16.9 versus 25) results in faster thermal response. Circuit validation is recommended if the original design relies on specific inrush current tolerance windows.

Q: Why is the 0683G3150-11 not suitable as a substitute?

A: The 0683G3150-11 requires a separate holder cartridge and is not designed for direct surface mount PCB installation. The UMTS 3.15 is specified as a board mount fuse in 2-SMD square end block package. The 0683G3150-11 cartridge, non-standard package configuration is mechanically incompatible with existing PCB layouts.

Q: What is the difference between the TR-1245UMFT3-15-R and the original UMTS 3.15?

A: Both parts share identical current rating (3.15 A), voltage rating (250 V AC), response time (Slow Blow), and package configuration (2-SMD, Square End Block). The primary differences are manufacturer (Eaton versus Bel Fuse), operating temperature minimum (-40°C versus -55°C), and melting I²t (31 versus 25). The TR-1245UMFT3-15-R is actively manufactured and ROHS3 compliant, making it suitable for new designs and ongoing procurement.

Q: Are there any compliance or certification differences between the substitute parts?

A: The UMTS 3.15 carries CE, cULus, and UMF approvals. The TR-1245UMFT3-15-R carries cURus approval. The 0683G3150-01 carries CE and cURus approvals. Designs requiring specific certification marks (such as UL or cUL) should verify that the selected substitute meets applicable regulatory requirements for the target application and market.

Q: Can the 0683G3150-01 be used in applications requiring the full -55°C to 125°C operating temperature range?

A: The 0683G3150-01 is rated for -55°C to 125°C, matching the original UMTS 3.15 specification. This part is suitable for applications requiring the full temperature range.

Q: What is the impact of different melting I²t values on circuit performance?

A: Melting I²t determines the thermal energy required to melt the fuse element. The UMTS 3.15 has melting I²t of 25, the 0683G3150-01 has 16.9, and the TR-1245UMFT3-15-R has 31. Lower melting I²t results in faster response to overcurrent conditions. Circuit designs with marginal inrush current profiles should be validated when substituting parts with significantly different melting I²t values to ensure the fuse does not nuisance-trip during normal operation.