5TTP 3.15-R Equivalent & Substitute Parts

Part Overview

The 5TTP 3.15-R is a 3.15 A, 125 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm through-hole package. This component is actively produced and widely used in circuit protection applications requiring reliable overcurrent protection with delayed response characteristics. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across different voltage ratings and manufacturer specifications while preserving the core protective function.

Substiute Parts

5TTP 3.15-R

Bel Fuse Inc.In Stock: 19165TTP 3.15-R Datasheet

Current PartRFQ

02393.15MXEP

LittelfuseIn Stock: 259602393.15MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5TTP 3.15-R is determined by the following critical parameters:

• Current Rating: Must be 3.15 A (exact match required)
• Fuse Type: Must be Cartridge, Glass (same construction and response characteristics)
• Response Time: Must be Slow Blow (identical protective behavior)
• Package / Case: Must be 5mm x 20mm (Axial) (mechanical fit requirement)
• Mounting Type: Must be Through Hole (circuit board compatibility)
• Operating Temperature Range: Must support -55°C ~ 125°C minimum
• Voltage Rating - AC: May exceed 125 V (higher voltage rating provides backward compatibility in lower voltage applications)

The identified substitute part, 02393.15MXEP from Littelfuse, matches all mandatory parameters. The voltage rating difference (250 V vs. 125 V) represents an upgrade in voltage capability, which is acceptable for substitution in 125 V circuits.

Parameter Comparison

Engineering Selection Recommendations

The 02393.15MXEP from Littelfuse is a qualified substitute for the 5TTP 3.15-R based on matching current rating, fuse type, response time, package dimensions, and mounting configuration. Both components are active products with ROHS3 compliance and equivalent operating temperature ranges.

The substitute part carries additional regulatory approvals (UL and KC) beyond the original part's certifications (CE, CSA, PSE), providing expanded compliance coverage. The higher voltage rating (250 V) of the substitute is suitable for 125 V AC applications and represents a conservative design choice.

Differences in breaking capacity, melting I²t, and DC cold resistance reflect manufacturer-specific design variations. These differences do not preclude substitution when the application circuit voltage and current requirements align with the 125 V, 3.15 A specification of the original part.

Frequently Asked Questions (FAQ)

Q: Can the 02393.15MXEP be used in place of the 5TTP 3.15-R?

A: Yes. Both parts share identical current rating (3.15 A), fuse type (Cartridge, Glass), response time (Slow Blow), package dimensions (5mm x 20mm), and mounting type (Through Hole). The substitute's higher voltage rating (250 V) is compatible with 125 V circuits.

Q: Why does the substitute part have a higher voltage rating?

A: The 02393.15MXEP is rated for 250 V AC, compared to the 5TTP 3.15-R's 125 V AC rating. A higher voltage rating does not affect performance in lower voltage applications and is acceptable for substitution.

Q: Are there differences in breaking capacity between these parts?

A: Yes. The 5TTP 3.15-R has a breaking capacity of 10 kA at rated voltage, while the 02393.15MXEP is rated at 100 A. Breaking capacity specifications are manufacturer-specific and do not prevent substitution when circuit requirements are met.

Q: Do both parts have the same physical dimensions?

A: Both parts use the 5mm x 20mm (Axial) package. The 5TTP 3.15-R measures 0.217" Dia x 0.827" L (5.50mm x 21.00mm), while the 02393.15MXEP measures 0.217" Dia x 0.846" L (5.50mm x 21.50mm). The minimal length difference does not affect mechanical compatibility in standard through-hole applications.

Q: What regulatory certifications apply to the substitute part?

A: The 02393.15MXEP holds CE, CSA, KC, PSE, and UL approvals. The original 5TTP 3.15-R holds CE, CSA, and PSE approvals. The substitute provides additional compliance coverage.

Q: Are both parts RoHS compliant?

A: Yes. Both the 5TTP 3.15-R and 02393.15MXEP are ROHS3 compliant.