Equivalent & Substitute Parts for 5ET 2.5-R

Part Overview

The 5ET 2.5-R 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 fuse is designed for applications requiring overcurrent protection in industrial and commercial equipment. The part maintains active product status with 1441 units in stock. Equivalent and substitute parts are necessary when the primary part is unavailable, when alternative certifications are required for specific markets, or when application-specific breaking capacity and melting I²t characteristics necessitate selection from the available alternatives.

Substiute Parts

5ET 2.5-R

Bel Fuse Inc.In Stock: 14615ET 2.5-R Datasheet

Current PartRFQ

5ST 2.5-R

Bel Fuse Inc.In Stock: 60485ST 2.5-R Datasheet

Parametric EquivalentRFQ

5TT 2.5-R

Bel Fuse Inc.In Stock: 26365TT 2.5-R Datasheet

Parametric EquivalentRFQ

021902.5MXAP

LittelfuseIn Stock: 1082021902.5MXAP Datasheet

DirectRFQ

021802.5HXP

LittelfuseIn Stock: 21320021802.5HXP Datasheet

SimilarRFQ

021802.5TXP

Littelfuse Inc.In Stock: 900021802.5TXP Datasheet

SimilarRFQ

GDC-2.5A

Eaton - Electronics DivisionIn Stock: 997GDC-2.5A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Mandatory Matching Parameters:

• Current Rating: 2.5 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Package / Case: 5mm x 20mm
• Response Time: Slow Blow
• Mounting Type: Requires Holder
• Operating Temperature Range: -55°C ~ 125°C (minimum)

Variable Parameters (Application-Dependent):

• Breaking Capacity @ Rated Voltage: 35 A to 150 A
• Melting I²t: 20 to 138
• DC Cold Resistance: 0.02 Ω to 0.056 Ω
• Approval Agencies: Varies by regional requirements

All identified substitutes meet the mandatory matching parameters. Differences in breaking capacity, melting I²t, and DC cold resistance reflect design variations within the same functional category and must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Parametric Equivalents (Bel Fuse Inc. Series): The 5ST 2.5-R and 5TT 2.5-R are parametric equivalents from the same manufacturer. Selection between these and the 5ET 2.5-R depends on breaking capacity requirements. The 5ET 2.5-R provides 150 A breaking capacity; the 5TT 2.5-R provides 100 A; the 5ST 2.5-R provides 35 A. All three maintain active product status and ROHS3 compliance. Approval agency coverage differs: the 5ET 2.5-R includes CCC, CE, CSA, cURus, SEMKO, and VDE; the 5ST 2.5-R adds IMQ; the 5TT 2.5-R includes CE, CSA, cULus, and PSE.

Direct Manufacturer Equivalent (Littelfuse 021902.5MXAP): The 021902.5MXAP from Littelfuse provides matching breaking capacity (150 A) and melting I²t (138) to the 5ET 2.5-R. This part carries broader certification coverage including CCC, CE, CSA, PSE, SEMKO, UL, and VDE. Inventory availability is 1000 units.

Similar Alternatives (Littelfuse 218 Series): The 021802.5HXP and 021802.5TXP both feature lower breaking capacity (35 A) and reduced melting I²t (23.25) compared to the 5ET 2.5-R. The 021802.5HXP offers the highest inventory availability at 21272 units and includes K-MARK certification. The 021802.5TXP adds KC certification. Both are suitable for applications with lower fault current requirements.

Similar Alternative (Eaton GDC-2.5A): The GDC-2.5A provides 35 A breaking capacity with elevated melting I²t (59.4). Certification coverage includes cURus, IMQ, and MITI/JET. This option is appropriate for specific regional requirements where Eaton certification is mandated.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute fuse with different breaking capacity? A: Yes, provided the application's maximum fault current does not exceed the substitute fuse's breaking capacity rating. A fuse with lower breaking capacity (such as 35 A versus 150 A) is suitable only for circuits with correspondingly lower available fault current. Conversely, a fuse with higher breaking capacity provides additional safety margin in high-fault-current environments.

Q: What is the significance of melting I²t in fuse selection? A: Melting I²t characterizes the thermal energy required to melt the fuse element. Lower I²t values indicate faster response to overcurrent; higher values indicate slower response. The 5ET 2.5-R has melting I²t of 137, while alternatives range from 20 to 138. Selection must align with circuit protection coordination requirements and equipment thermal withstand ratings.

Q: Are all substitute parts physically interchangeable? A: All identified substitutes share the same 5mm x 20mm package and require the same holder type. Physical installation is identical. However, dimensional tolerances vary slightly: the 5ET 2.5-R measures 0.201" diameter, while Littelfuse and Eaton parts measure 0.205" diameter. These variations remain within standard holder tolerances and do not affect interchangeability.

Q: Which substitute offers the best inventory availability? A: The 021802.5HXP from Littelfuse provides the highest inventory at 21272 units. This part is suitable for applications requiring 35 A breaking capacity and includes comprehensive certification coverage (CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE).

Q: What certifications should I verify for my specific market? A: Certification requirements vary by region. The 5ET 2.5-R includes CCC, CE, CSA, cURus, SEMKO, and VDE. The 021902.5MXAP from Littelfuse adds PSE and UL coverage. The 021802.5HXP adds K-MARK. Verify that your selected substitute carries certifications required by your target market and end-use application.

Q: Can I mix different substitute parts in the same equipment? A: All identified substitutes meet the mandatory matching parameters (2.5 A, 250 V AC, 5mm x 20mm, slow-blow response). However, using different fuse types within a single circuit may result in inconsistent protection characteristics. Maintain consistency within a circuit or equipment assembly.