Bel Fuse Inc. 5ET 2 Glass Cartridge Fuse 2A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5ET 2 is a 2A 250VAC slow-blow glass cartridge fuse in 5x20mm form factor, designed for circuit protection in AC/DC applications. This part is classified as obsolete. Due to its discontinued status, equivalent and substitute parts from active product lines are necessary to maintain system functionality and ensure continued availability for replacement and new designs.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
Breaking Capacity @ Rated Voltage	150A
Melting I²t	92

Substitute Part Grouping Explanation

Substitution eligibility 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 (AC): 250 V (exact match required)
Response Time: Slow Blow (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 (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: Parts from the same manufacturer (Bel Fuse Inc.) with identical electrical and mechanical specifications, differing only in product status (active vs. obsolete) or packaging format.

Parametric Equivalent: Parts from the same or different manufacturers that meet all core electrical and mechanical parameters but may vary in secondary characteristics such as breaking capacity, melting I²t, DC cold resistance, or approval agency certifications.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
5ET 2	Bel Fuse Inc.	2	250	Slow Blow	5x20mm	150	92	0.043	Obsolete	Non-compliant
5ET 2-R	Bel Fuse Inc.	2	250	Slow Blow	5x20mm	150	92	0.043	Active	ROHS3 Compliant
5ST 2-R	Bel Fuse Inc.	2	250	Slow Blow	5x20mm	35	12	0.03	Active	ROHS3 Compliant
5TT 2-R	Bel Fuse Inc.	2	250	Slow Blow	5x20mm	100	29.9	0.08	Active	ROHS3 Compliant
0213002.MXP	Littelfuse Inc.	2	250	Slow Blow	5x20mm	35	92.705	0.0452	Active	ROHS3 Compliant
0218002.HXP	Littelfuse Inc.	2	250	Slow Blow	5x20mm	35	14.45	0.0293	Active	ROHS3 Compliant
0218002.MXBP	Littelfuse Inc.	2	250	Slow Blow	5x20mm	35	14.45	0.0293	Active	ROHS3 Compliant
0218002.MXP	Littelfuse Inc.	2	250	Slow Blow	5x20mm	35	14.45	0.0293	Active	ROHS3 Compliant
0218002.TXP	Littelfuse Inc.	2	250	Slow Blow	5x20mm	35	14.45	0.0293	Active	ROHS3 Compliant
0219002.MXAP	Littelfuse Inc.	2	250	Slow Blow	5x20mm	150	92.705	0.0452	Active	ROHS3 Compliant
0239002.HXP	Littelfuse Inc.	2	250	Slow Blow	5x20mm	100	50.585	0.0943	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 5ET 2-R (Bel Fuse Inc.)

The 5ET 2-R is the direct manufacturer equivalent of the obsolete 5ET 2. It maintains identical electrical specifications (2A, 250VAC, 150A breaking capacity, 92 melting I²t) and mechanical form factor. The primary distinction is active product status and ROHS3 compliance. This part is the preferred replacement for direct substitution in existing designs.

Secondary Recommendations: Littelfuse Inc. Series 219XA (0219002.MXAP)

The 0219002.MXAP from Littelfuse Inc. matches the original 5ET 2 in breaking capacity (150A) and melting I²t (92.705), providing equivalent protection characteristics. It holds active product status and ROHS3 compliance. Approval agencies include CCC, CE, CSA, PSE, SEMKO, UL, and VDE.

Alternative Options: Littelfuse Inc. Series 218 and 213

Parts 0218002.HXP, 0218002.MXBP, 0218002.MXP, 0218002.TXP, and 0213002.MXP are parametric equivalents with reduced breaking capacity (35A) and lower melting I²t values. These are suitable only for applications where the original 150A breaking capacity is not a design requirement. All maintain 2A, 250VAC ratings and 5x20mm form factor.

Bel Fuse Inc. Series 5ST and 5TT

The 5ST 2-R and 5TT 2-R are parametric equivalents with reduced breaking capacity and melting I²t. Selection depends on application-specific protection requirements. Both are active products with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use 5ET 2-R as a direct replacement for 5ET 2?

A: Yes. The 5ET 2-R is the direct manufacturer equivalent with identical electrical and mechanical specifications. The only differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant).

Q: What is the difference between breaking capacity ratings in the substitute parts?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. The original 5ET 2 has 150A breaking capacity. Some substitutes (Littelfuse 218 and 213 series) have 35A breaking capacity. Selection depends on the maximum fault current expected in your circuit. Lower breaking capacity parts are suitable only for applications with lower fault current levels.

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

A: All listed substitutes maintain the 5x20mm form factor and require a holder. Physical compatibility is ensured. However, verify that your specific fuse holder is rated for the electrical characteristics of the substitute part, particularly breaking capacity and voltage rating.

Q: What does melting I²t indicate?

A: Melting I²t is a thermal energy parameter that characterizes fuse response time and protection characteristics. The original 5ET 2 has a melting I²t of 92. Substitutes vary: Littelfuse 219XA series matches at 92.705, while 218 and 213 series are lower at 14.45 and 92.705 respectively. Higher melting I²t values indicate slower response to overcurrent conditions.

Q: Which substitute offers the best compliance coverage?

A: The 0219002.MXAP (Littelfuse 219XA series) provides broad approval agency coverage including CCC, CE, CSA, PSE, SEMKO, UL, and VDE. The 5ET 2-R (Bel Fuse) includes CCC, CE, CSA, cURus, SEMKO, and VDE. Verify specific certifications required for your application.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance depends on your product's target market and regulatory requirements. The original 5ET 2 is RoHS non-compliant. All active substitutes listed are ROHS3 compliant. If your application requires RoHS compliance, select from the active product alternatives.

Q: Can I use Littelfuse parts as substitutes for Bel Fuse parts?

A: Yes, provided all core electrical and mechanical parameters match: 2A current rating, 250VAC voltage rating, slow-blow response, 5x20mm form factor, and compatible breaking capacity and melting I²t for your application. Cross-manufacturer substitution is valid when these parameters align.

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