Equivalent & Substitute Parts for 5ET 5 Glass Cartridge Fuse

Part Overview

The 5ET 5 is a 5 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm × 20mm form factor. This part is classified as obsolete, though 1010 pieces remain in stock. Due to its obsolete status, identifying equivalent and substitute parts is essential for ongoing system maintenance and new design implementations. Substitute parts must maintain electrical and mechanical compatibility while meeting the same operational requirements.

Key Parameters

Parameter	5ET 5
Current Rating	5 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm × 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
Breaking Capacity @ Rated Voltage	150 A
Melting I²t	444
DC Cold Resistance	0.012 Ω

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Current Rating: Must be 5 A
Voltage Rating (AC): Must be 250 V
Response Time: Must be Slow Blow
Package / Case: Must be 5mm × 20mm
Fuse Type: Must be Cartridge, Glass
Mounting Type: Must require holder
Operating Temperature Range: Must support -55°C to 125°C

Parts are grouped into two categories:

Direct Equivalent: 5ET 5-R (Bel Fuse Inc.) — identical series, active product status, same electrical and mechanical specifications.

Parametric Equivalents: 5ST 5-R (Bel Fuse Inc.) — same manufacturer, meets all core electrical and mechanical parameters, though breaking capacity and melting I²t differ.

Similar Substitutes: Parts from Littelfuse Inc. (0213005.MXP, 0218005.HXP, 0218005.MXBP, 0218005.MXP, 0218005.TXP) and Eaton Electronics Division (GDC-5A) — meet all core electrical and mechanical parameters with minor dimensional and resistance variations within acceptable tolerances.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package (mm)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
5ET 5	Bel Fuse Inc.	5	250	Slow Blow	5 × 20	150	444	0.012	Obsolete	Non-compliant
5ET 5-R	Bel Fuse Inc.	5	250	Slow Blow	5 × 20	150	444	0.012	Active	ROHS3 Compliant
5ST 5-R	Bel Fuse Inc.	5	250	Slow Blow	5 × 20	50	95	0.011	Active	ROHS3 Compliant
0213005.MXP	Littelfuse Inc.	5	250	Slow Blow	5 × 20	50	314	0.0116	Active	ROHS3 Compliant
0218005.HXP	Littelfuse Inc.	5	250	Slow Blow	5 × 20	50	111	0.0104	Active	ROHS3 Compliant
0218005.MXBP	Littelfuse Inc.	5	250	Slow Blow	5 × 20	50	111	0.0104	Active	ROHS3 Compliant
0218005.MXP	Littelfuse Inc.	5	250	Slow Blow	5 × 20	50	111	0.0104	Active	ROHS3 Compliant
0218005.TXP	Littelfuse Inc.	5	250	Slow Blow	5 × 20	50	111	0.0104	Active	ROHS3 Compliant
GDC-5A	Eaton - Electronics Division	5	250	Slow Blow	5 × 20	50	142.5	0.00985	Active	Not specified

Engineering Selection Recommendations

Primary Recommendation: 5ET 5-R (Bel Fuse Inc.) is the direct equivalent. It maintains identical electrical and mechanical specifications, is manufactured by the same supplier, and carries active product status with ROHS3 compliance. This part is the preferred choice for direct replacement.

Secondary Recommendation: 5ST 5-R (Bel Fuse Inc.) is a parametric equivalent from the same manufacturer. While breaking capacity and melting I²t differ, all core electrical and mechanical parameters align. This part is suitable where the lower breaking capacity and melting I²t are acceptable for the application.

Alternative Substitutes: Littelfuse Inc. parts (0213005.MXP, 0218005.HXP, 0218005.MXBP, 0218005.MXP, 0218005.TXP) and Eaton GDC-5A meet all core electrical and mechanical requirements. These parts carry active product status and ROHS3 compliance (Littelfuse parts). Selection among these alternatives depends on supply chain availability, approval agency certifications required by the application, and dimensional tolerances within the 5mm × 20mm specification.

Frequently Asked Questions (FAQ)

Q: Can 5ET 5-R be used as a direct replacement for 5ET 5?

A: Yes. 5ET 5-R is the direct equivalent with identical electrical and mechanical specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between 5ET 5 and 5ST 5-R?

A: Both are 5 A, 250 V slow-blow glass cartridge fuses in 5mm × 20mm packages from Bel Fuse Inc. The 5ST 5-R has lower breaking capacity (50 A vs. 150 A) and lower melting I²t (95 vs. 444). Selection depends on whether the application requires the higher breaking capacity of the 5ET series.

Q: Are Littelfuse parts compatible with the 5ET 5?

A: Littelfuse parts (0213005.MXP, 0218005.HXP, 0218005.MXBP, 0218005.MXP, 0218005.TXP) meet all core electrical and mechanical parameters: 5 A, 250 V, slow-blow response, and 5mm × 20mm package. Minor variations exist in breaking capacity, melting I²t, and DC cold resistance. Compatibility depends on application-specific requirements for these parameters and approval agency certifications.

Q: What approval agencies are supported across substitute parts?

A: The 5ET 5 carries CCC, CE, CSA, cULus, SEMKO, and VDE approvals. Littelfuse parts support broader certification portfolios including BSI, K-MARK, PSE, and UR in addition to the core agencies. Eaton GDC-5A supports cURus, IMQ, and MITI/JET. Verify that selected substitute parts carry certifications required by the target application and regulatory jurisdiction.

Q: Can I use GDC-5A as a substitute?

A: GDC-5A from Eaton meets all core electrical and mechanical parameters. It has active product status and carries relevant approval certifications. The DC cold resistance (0.00985 Ω) is slightly lower than the 5ET 5 (0.012 Ω), and melting I²t is 142.5 compared to 444. These differences are within acceptable tolerances for most applications, but verify compatibility with specific circuit requirements.

Q: What is the significance of melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. The 5ET 5 has melting I²t of 444, while most Littelfuse substitutes have 111. Lower melting I²t means faster response to overcurrent. Select substitutes based on whether the application requires the specific thermal response characteristics of the original part.

Q: Are all substitute parts RoHS compliant?

A: The 5ET 5 is RoHS non-compliant. All active substitute parts listed (5ET 5-R, 5ST 5-R, Littelfuse series, and GDC-5A) are ROHS3 compliant or have compliant status specified. This is advantageous for new designs and systems requiring RoHS compliance.

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