UMTS 2 Equivalent & Substitute Parts Reference

Part Overview

The UMTS 2 is a 2A 350VAC surface mount board mount fuse manufactured by Bel Fuse Inc. with slow blow response characteristics. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and procurement planning. The UMTS 2 operates across a temperature range of -55°C to 125°C and meets ROHS3 compliance requirements with cULus approval.

Substiute Parts

UMTS 2

Bel Fuse Inc.In Stock: 807UMTS 2 Datasheet

Current PartRFQ

0683G2000-01

Bel Fuse Inc.In Stock: 29680683G2000-01 Datasheet

SimilarRFQ

TR-1245UMFT2-R

Eaton - Electronics DivisionIn Stock: 4988TR-1245UMFT2-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UMTS 2 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Current Rating: 2 A (exact match required)
• Voltage Rating - AC: 350 V (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Response Time: Slow Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 100A (exact match required)

Secondary Compatibility Criteria:

• Operating Temperature Range: -55°C ~ 125°C (substitute must meet or exceed)
• RoHS Status: ROHS3 Compliant (substitute must maintain compliance)
• Approval Agency: cULus certification (substitute must maintain equivalent certifications)

The two substitute parts identified meet these criteria with the following considerations:

0683G2000-01 (Bel Fuse Inc.): Matches all primary criteria. Provides additional DC voltage rating (125 V DC) not present in the main part. Melting I²t value differs (5.6 vs 9.2), indicating different thermal response characteristics within the slow blow classification. Maintains ROHS3 compliance with enhanced certifications (CE, cURus).

TR-1245UMFT2-R (Eaton - Electronics Division): Matches all primary criteria with one exception: AC voltage rating is 250 VAC versus 350 VAC on the main part. This represents a voltage derating and restricts application scope. Melting I²t value is higher (11 vs 9.2). Maintains ROHS3 compliance with cURus certification.

Parameter Comparison

Engineering Selection Recommendations

0683G2000-01 (Bel Fuse Inc.): This substitute maintains full electrical and mechanical compatibility with the UMTS 2 across all primary parameters. The part is active in production, ensuring long-term availability. It provides enhanced certification coverage (CE, cURus) compared to the original cULus certification. The lower melting I²t value (5.6 vs 9.2) indicates faster thermal response within the slow blow category, which may affect circuit protection timing in applications with specific inrush current profiles. This part is suitable for direct replacement in applications where the lower thermal mass is acceptable or beneficial.

TR-1245UMFT2-R (Eaton - Electronics Division): This substitute meets all primary electrical and mechanical criteria except for AC voltage rating, which is derated to 250 VAC. This part is active in production with cURus certification. The higher melting I²t value (11 vs 9.2) indicates slower thermal response. This substitute is applicable only in circuits operating at 250 VAC or below. The operating temperature minimum is -40°C, which is 15°C higher than the original part, restricting use in applications requiring -55°C operation.

Frequently Asked Questions (FAQ)

Q: Can the 0683G2000-01 be used as a direct replacement for the UMTS 2?

A: Yes. The 0683G2000-01 maintains identical current rating (2A), AC voltage rating (350V), mounting type (surface mount), package configuration (2-SMD, Square End Block), response time (slow blow), and breaking capacity (100A). The part is active in production with enhanced certifications. The difference in melting I²t (5.6 vs 9.2) represents a variation in thermal response characteristics within the slow blow classification and should be evaluated against specific circuit protection requirements.

Q: Can the TR-1245UMFT2-R be used as a direct replacement for the UMTS 2?

A: Conditional substitution only. The TR-1245UMFT2-R matches current rating, mounting type, package configuration, response time, and breaking capacity. However, the AC voltage rating is 250 VAC, which is lower than the UMTS 2 specification of 350 VAC. This part is suitable only for applications operating at 250 VAC or below. The operating temperature minimum of -40°C also restricts use in applications requiring -55°C operation.

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

A: Melting I²t is a thermal characteristic that defines the energy required to melt the fuse element. The UMTS 2 has a melting I²t of 9.2, the 0683G2000-01 has 5.6, and the TR-1245UMFT2-R has 11. Lower values indicate faster thermal response to overcurrent conditions, while higher values indicate slower response. All three parts are classified as slow blow, but the 0683G2000-01 responds faster than the original, while the TR-1245UMFT2-R responds slower. Circuit protection timing and inrush current tolerance must be evaluated for each application.

Q: Are all three parts RoHS3 compliant?

A: Yes. The UMTS 2, 0683G2000-01, and TR-1245UMFT2-R are all ROHS3 compliant, meeting environmental and hazardous substance restrictions.

Q: What certifications do these parts carry?

A: The UMTS 2 carries cULus certification. The 0683G2000-01 carries CE and cURus certifications. The TR-1245UMFT2-R carries cURus certification. All certifications meet industry safety standards for electrical components.

Q: Why is the UMTS 2 classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The 0683G2000-01 and TR-1245UMFT2-R are both active parts and represent current manufacturing alternatives for equivalent functionality.