Equivalent & Substitute Parts for 5VT 2.5

Part Overview

The 5VT 2.5 is a 2.5 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm package with slow blow response characteristics. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The 5VT 2.5 requires a fuse holder for installation and is suitable for applications requiring slow blow protection in the 2.5 ampere range at 250 volts.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35 A

Substitute Part Grouping Explanation

Substitution for the 5VT 2.5 is determined by strict equivalence across the following parameters: current rating (2.5 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (cartridge glass), response time (slow blow), and mounting requirement (requires holder). All substitute parts listed maintain these core electrical and mechanical specifications.

Substitute parts are grouped into two categories:

Parametric Equivalents maintain identical electrical characteristics and response behavior, differing primarily in breaking capacity and RoHS compliance status. These parts are direct functional replacements.

Similar Parts maintain the same current, voltage, package, and response time but may vary in breaking capacity, melting I²t values, DC cold resistance, or approval agency certifications. These parts are compatible for equivalent circuit protection but require verification of application-specific requirements such as breaking capacity and regulatory certifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
5VT 2.5	Bel Fuse Inc.	2.5	250	5mm x 20mm	Slow Blow	35	137	0.03	Obsolete	Non-compliant
5ET 2.5-R	Bel Fuse Inc.	2.5	250	5mm x 20mm	Slow Blow	150	137	0.031	Active	ROHS3 Compliant
5ST 2.5-R	Bel Fuse Inc.	2.5	250	5mm x 20mm	Slow Blow	35	20	0.02	Active	ROHS3 Compliant
5TT 2.5-R	Bel Fuse Inc.	2.5	250	5mm x 20mm	Slow Blow	100	45	0.056	Active	ROHS3 Compliant
021802.5HXP	Littelfuse	2.5	250	5mm x 20mm	Slow Blow	35	23.25	0.0219	Active	ROHS3 Compliant
021802.5TXP	Littelfuse Inc.	2.5	250	5mm x 20mm	Slow Blow	35	23.25	0.0219	Active	ROHS3 Compliant
021902.5MXAP	Littelfuse	2.5	250	5mm x 20mm	Slow Blow	150	138	0.0305	Active	ROHS3 Compliant
BK1/GMC-2.5-R	Eaton - Electronics Division	2.5	250	5mm x 20mm	Medium Blow	100	13	0.035	Active	ROHS3 Compliant
BK1/GMD-2.5-R	Eaton - Electronics Division	2.5	250	5mm x 20mm	Slow Blow	100	94	0.0905	Active	ROHS3 Compliant
GDC-2.5A	Eaton - Electronics Division	2.5	250	5mm x 20mm	Slow Blow	35	59.4	0.0255	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 5VT 2.5, the 5ET 2.5-R from Bel Fuse Inc. is the primary parametric equivalent. It maintains identical melting I²t (137), matching slow blow response characteristics, and is ROHS3 compliant with active product status. The 5ET 2.5-R offers higher breaking capacity (150 A) compared to the original 35 A specification.

The 5ST 2.5-R and 5TT 2.5-R from Bel Fuse Inc. are active alternatives with identical current and voltage ratings. The 5ST 2.5-R matches the original breaking capacity (35 A) but has lower melting I²t (20), resulting in faster response. The 5TT 2.5-R provides intermediate breaking capacity (100 A) with melting I²t of 45.

Littelfuse 021802.5HXP and 021802.5TXP are mechanically and electrically compatible with matching breaking capacity (35 A) and are ROHS3 compliant. The 021902.5MXAP from Littelfuse provides higher breaking capacity (150 A) with melting I²t of 138, closely matching the original part's response characteristics.

Eaton parts BK1/GMD-2.5-R and GDC-2.5A maintain slow blow response with ROHS3 compliance. The BK1/GMC-2.5-R has medium blow response and should be selected only when medium blow characteristics are acceptable for the application. All Eaton parts are active and ROHS3 compliant.

Selection should prioritize active product status and ROHS3 compliance for new designs. Breaking capacity and melting I²t values must be verified against specific circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5VT 2.5 be directly replaced with any of the listed substitute parts?

A: Yes, all listed parts maintain the same current rating (2.5 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), and slow blow response time, with the exception of BK1/GMC-2.5-R which has medium blow response. Direct mechanical and electrical compatibility is confirmed for all parts listed.

Q: What is the difference between parametric equivalents and similar parts?

A: Parametric equivalents (5ET 2.5-R, 5ST 2.5-R, 5TT 2.5-R, 021902.5MXAP) maintain the same melting I²t or very similar values, ensuring identical or near-identical response behavior. Similar parts may have different melting I²t values, resulting in variations in response time and breaking capacity, but remain compatible for the same circuit protection application.

Q: Why does the 5VT 2.5 show as obsolete?

A: The 5VT 2.5 is classified as obsolete by the manufacturer. Multiple active alternatives from Bel Fuse Inc., Littelfuse, and Eaton are available with identical electrical and mechanical specifications, making transition to active parts straightforward.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The original 5VT 2.5 is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitute parts are suitable.

Q: What is the significance of breaking capacity differences?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The original 5VT 2.5 has 35 A breaking capacity. Substitute parts range from 35 A to 150 A. Higher breaking capacity provides greater safety margin in high-fault-current applications but does not affect normal operation at rated current.

Q: Does the package dimension vary among substitute parts?

A: All substitute parts maintain the 5mm x 20mm package dimension. Minor dimensional variations exist (5.10mm vs 5.20mm diameter), but these are within mechanical tolerance and do not affect holder compatibility.

Q: Which substitute part most closely matches the original 5VT 2.5 characteristics?

A: The 5ET 2.5-R from Bel Fuse Inc. is the closest match, with identical melting I²t (137) and slow blow response. It is the recommended primary replacement for the obsolete 5VT 2.5.

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