5VT 2.5-R Equivalent & Substitute Parts

Part Overview

The 5VT 2.5-R is a 2.5 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. with a 5mm x 20mm form factor and slow blow response time. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs requiring compatible fuse protection.

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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 5VT 2.5-R is determined by strict alignment of the following parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these core electrical and mechanical requirements. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are permitted within the scope of equivalent substitution, provided the part maintains the same functional protection characteristics for the intended application.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status
5VT 2.5-R	Bel Fuse Inc.	2.5	250	Slow Blow	5mm x 20mm	35	137	0.03	Obsolete
021302.5MXP	Littelfuse Inc.	2.5	250	Slow Blow	5mm x 20mm	35	138	0.0305	Active
021802.5HXP	Littelfuse	2.5	250	Slow Blow	5mm x 20mm	35	23.25	0.0219	Active
021802.5TXP	Littelfuse Inc.	2.5	250	Slow Blow	5mm x 20mm	35	23.25	0.0219	Active
021902.5MXAP	Littelfuse	2.5	250	Slow Blow	5mm x 20mm	150	138	0.0305	Active
BK1/GMC-2.5-R	Eaton - Electronics Division	2.5	250	Medium Blow	5mm x 20mm	100	13	0.035	Active
BK1/GMD-2.5-R	Eaton - Electronics Division	2.5	250	Slow Blow	5mm x 20mm	100	94	0.0905	Active
GDC-2.5A	Eaton - Electronics Division	2.5	250	Slow Blow	5mm x 20mm	35	59.4	0.0255	Active

Engineering Selection Recommendations

Direct substitutes with active product status and closest parameter alignment to the 5VT 2.5-R include:

Littelfuse 021302.5MXP — Active status with melting I²t of 138 (nearest to original 137) and identical breaking capacity of 35 A. Supports broader approval agency coverage including BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE.

Littelfuse 021802.5HXP — Active status with extensive inventory availability (21,272 pcs). Maintains slow blow response and 35 A breaking capacity. Supports CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE certifications.

Littelfuse 021902.5MXAP — Active status with enhanced breaking capacity of 150 A, providing higher fault protection margin. Maintains slow blow response and melting I²t of 138. Supports CCC, CE, CSA, PSE, SEMKO, UL, and VDE certifications.

Eaton BK1/GMD-2.5-R — Active status with slow blow response matching the original part. Supports CSA, PSE/JET, and UL certifications. Note: Higher DC cold resistance (0.0905 Ohms) compared to original.

Eaton GDC-2.5A — Active status with slow blow response and 35 A breaking capacity. Supports cURus, IMQ, and MITI/JET certifications.

Note on BK1/GMC-2.5-R — This part features medium blow response time, differing from the original slow blow characteristic. Selection requires confirmation that medium blow response is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different response time (medium blow vs. slow blow)?

A: Response time is a critical parameter for fuse selection. The 5VT 2.5-R is slow blow, designed to tolerate brief inrush currents without nuisance operation. Medium blow fuses (such as BK1/GMC-2.5-R) respond faster and may not be suitable for applications with inrush current characteristics. Application verification is required before substitution.

Q: What is the significance of breaking capacity differences among substitute parts?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. The original 5VT 2.5-R has 35 A breaking capacity. Substitutes with higher breaking capacity (100 A or 150 A) provide enhanced fault protection margins and are suitable for applications with higher available fault currents. Lower breaking capacity is not acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant, matching the environmental compliance status of the original 5VT 2.5-R.

Q: Does the 5mm x 20mm package dimension vary among substitute parts?

A: All substitute parts maintain the 5mm x 20mm form factor and are mechanically compatible with holders designed for the original 5VT 2.5-R. Minor dimensional variations (e.g., 5.10mm vs. 5.20mm diameter) remain within standard tolerance for cartridge fuse holders.

Q: Which substitute offers the best inventory availability?

A: Littelfuse 021802.5HXP offers the highest inventory availability with 21,272 pcs in stock, compared to other substitutes ranging from 880 to 1,732 pcs.

Q: Can I substitute based on approval agency requirements?

A: Yes. If your application requires specific certifications (e.g., UL, CSA, VDE), select a substitute part that carries those certifications. The original 5VT 2.5-R supports CCC, CE, CSA, cULus, SEMKO, and VDE. Most active substitutes support overlapping certification sets, with some offering additional certifications such as PSE, K-MARK, or UR.

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