5MT 2-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5MT 2-R is a 2A 250VAC glass cartridge fuse with a 5mm x 20mm form factor, rated for medium blow response. This part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. The fuse requires a holder for installation and is designed for general-purpose circuit protection applications operating across -55°C to 125°C.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	100A
Operating Temperature Range	-55°C to 125°C
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 5MT 2-R is determined by strict alignment of electrical and mechanical parameters. All substitute parts must match the following core criteria:

Current Rating: 2 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C to 125°C (minimum requirement)

Response time characteristics (Medium Blow vs. Slow Blow) define functional behavior and determine application suitability. Parts are grouped into two categories: Medium Blow substitutes (direct functional equivalents) and Slow Blow alternatives (for applications requiring extended response characteristics).

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
5MT 2-R	Bel Fuse Inc.	2	250	Medium Blow	100	20	0.055	Obsolete
0234002.MXP	Littelfuse Inc.	2	250	Medium Blow	100	9.97	0.0684	Active
0232002.MXP	Littelfuse Inc.	2	250	Medium Blow	100	8.25	0.037	Active
BK1/GMC-2-R	Eaton - Electronics Division	2	250	Medium Blow	100	8.9	0.043	Active
0213002.MXP	Littelfuse Inc.	2	250	Slow Blow	35	92.705	0.0452	Active
0218002.HXP	Littelfuse Inc.	2	250	Slow Blow	35	14.45	0.0293	Active
0218002.MXP	Littelfuse Inc.	2	250	Slow Blow	35	14.45	0.0293	Active
0218002.TXP	Littelfuse Inc.	2	250	Slow Blow	35	14.45	0.0293	Active
0239002.HXP	Littelfuse Inc.	2	250	Slow Blow	100	50.585	0.0943	Active
BK1/GMD-2-R	Eaton - Electronics Division	2	250	Slow Blow	100	42	0.107	Active
GDC-2A	Eaton - Electronics Division	2	250	Slow Blow	35	31.6	0.03325	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Medium Blow Response)

The 0234002.MXP (Littelfuse Inc.), 0232002.MXP (Littelfuse Inc.), and BK1/GMC-2-R (Eaton - Electronics Division) are active production parts that maintain the medium blow response characteristic of the 5MT 2-R. All three parts carry ROHS3 compliance and are rated for 100A breaking capacity at 250V. These parts are suitable for direct replacement in applications where medium blow response is specified.

Alternative Options (Slow Blow Response)

Slow blow variants including 0213002.MXP, 0218002.HXP, 0218002.MXP, 0218002.TXP, 0239002.HXP, BK1/GMD-2-R, and GDC-2A provide extended response characteristics. These parts are appropriate only for applications designed to accommodate slow blow fuse behavior. Selection among slow blow options depends on breaking capacity requirements (35A or 100A) and specific regulatory certifications needed for the application.

All substitute parts maintain the 5mm x 20mm form factor, 2A current rating, 250V AC voltage rating, and -55°C to 125°C operating temperature range of the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a Slow Blow fuse as a substitute for the 5MT 2-R Medium Blow fuse?

A: No. The 5MT 2-R is specified as Medium Blow. Slow Blow substitutes (0213002.MXP, 0218002 series, 0239002.HXP, BK1/GMD-2-R, GDC-2A) have different response characteristics and melting I²t values. Use slow blow alternatives only if your circuit design explicitly requires extended response time.

Q: Are all substitute parts physically compatible with the original fuse holder?

A: Yes. All listed substitutes maintain the 5mm x 20mm cartridge form factor and require a holder for installation, matching the mechanical requirements of the 5MT 2-R.

Q: What is the difference between the Littelfuse 0234002.MXP and 0232002.MXP?

A: Both are Medium Blow, 2A 250V fuses with 100A breaking capacity. The primary difference is melting I²t (9.97 vs. 8.25) and DC cold resistance (0.0684 Ω vs. 0.037 Ω). Both are active production parts suitable for direct replacement.

Q: Which substitute has the broadest regulatory approval?

A: The 0218002.HXP and 0218002.MXP carry eight regulatory approvals (CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE), providing the widest compliance coverage among slow blow options.

Q: Can I substitute the Eaton BK1/GMC-2-R for the 5MT 2-R?

A: Yes. The BK1/GMC-2-R is an active Medium Blow fuse with matching electrical specifications (2A, 250V, 100A breaking capacity) and the same 5mm x 20mm form factor. It carries CSA, KC, MITI, and UL certifications.

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