5TT 500-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5TT 500-R is an active-status glass cartridge fuse manufactured by Bel Fuse Inc., rated for 500 mA at 250 V AC/DC. This slow-blow fuse is designed for applications requiring circuit protection in a compact 5mm x 20mm form factor with holder mounting. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative qualified sources meeting the same electrical and mechanical specifications.

Substiute Parts

5TT 500-R

Bel Fuse Inc.In Stock: 10005TT 500-R Datasheet

Current PartRFQ

5ST 500-R

Bel Fuse Inc.In Stock: 227525ST 500-R Datasheet

Parametric EquivalentRFQ

0239.500MXP

Littelfuse Inc.In Stock: 23500239.500MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5TT 500-R are qualified based on the following critical parameters that must match or remain compatible:

• Current Rating: 500 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C to 125°C (minimum requirement)

Substitutes identified include the 5ST 500-R (Bel Fuse Inc.) and 0239.500MXP (Littelfuse Inc.). Both maintain identical electrical ratings, fuse characteristics, and physical dimensions. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and approval agency certifications reflect manufacturer-specific design differences and do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and ROHS3 compliance, confirming ongoing manufacturer support and environmental regulatory alignment. Selection between the 5TT 500-R, 5ST 500-R, and 0239.500MXP should be based on:

• Approval agency requirements: The 5TT 500-R carries CE, CSA, and cULus certifications. The 5ST 500-R provides expanded certifications including CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE. The 0239.500MXP includes CE, CSA, KC, and UL certifications. Verify that the selected part meets all required regulatory approvals for the target application and market.

• Supply availability: Inventory levels vary across manufacturers. The 5ST 500-R offers the highest stock availability (22,671 pcs), followed by 0239.500MXP (2,300 pcs) and 5TT 500-R (902 pcs).

• Breaking capacity tolerance: The 5TT 500-R specifies 100 A breaking capacity, while both substitutes specify 35 A. Applications requiring higher breaking capacity must retain the 5TT 500-R.

• Resistance and thermal characteristics: DC cold resistance and melting I²t values differ across manufacturers. These variations reflect design methodology and do not affect functional compatibility within the specified electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can the 5ST 500-R or 0239.500MXP be used as direct replacements for the 5TT 500-R?

A: Yes, both parts are functionally interchangeable for applications where the 100 A breaking capacity of the 5TT 500-R is not a design requirement. All three parts share identical current rating (500 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and physical dimensions (5mm x 20mm). Verify that the selected substitute meets all required regulatory certifications for your application.

Q: What is the significance of the breaking capacity difference between the 5TT 500-R (100 A) and the substitutes (35 A)?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard. The 5TT 500-R is rated for higher fault current environments. If your circuit design specifies or requires 100 A breaking capacity, the 5TT 500-R must be used. For applications with lower fault current exposure, the 35 A breaking capacity of the substitutes is sufficient.

Q: Are there differences in approval certifications between these parts?

A: Yes. The 5TT 500-R carries CE, CSA, and cULus approvals. The 5ST 500-R includes additional certifications: CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE. The 0239.500MXP includes CE, CSA, KC, and UL. Select the part whose certification profile matches your target market and regulatory requirements.

Q: Do the differences in DC cold resistance and melting I²t affect interchangeability?

A: These parameters reflect manufacturer-specific design characteristics but do not affect functional interchangeability within the specified electrical ratings. All three parts are rated for 500 mA at 250 V AC/DC with slow-blow response. The variations in resistance and thermal characteristics are within acceptable tolerances for this fuse category.

Q: What mounting considerations apply to all three parts?

A: All three parts require a holder for mounting. Ensure that your circuit design includes a compatible 5mm x 20mm fuse holder. The fuse itself does not mount directly to the PCB or chassis.

Q: Are all three parts RoHS compliant?

A: Yes, all three parts are ROHS3 compliant, confirming compliance with Restriction of Hazardous Substances regulations.