Equivalent & Substitute Parts for AP/ETF-5 Board Mount Fuse

Part Overview

The AP/ETF-5 is a 5 A, 277 V AC board mount fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, necessitating identification of active substitute parts for new designs and ongoing production requirements. The AP/ETF-5 features a radial, can-style vertical mounting configuration with slow-blow response characteristics suitable for circuit protection applications requiring 277 V AC operation.

Substiute Parts

AP/ETF-5

Eaton - Electronics DivisionIn Stock: 831AP/ETF-5 Datasheet

Current PartRFQ

SR-5-5A-AP

Eaton - Electronics DivisionIn Stock: 5495SR-5-5A-AP Datasheet

SimilarRFQ

MRT 5-BULK

Bel Fuse Inc.In Stock: 17399MRT 5-BULK Datasheet

DirectRFQ

MRT 5-AMMO

Bel Fuse Inc.In Stock: 3496MRT 5-AMMO Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP/ETF-5 is constrained by the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 5 A (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Response Time: Slow Blow (exact match required)
• DC Cold Resistance: 0.01 Ohms (exact match required)

Voltage Rating Consideration: The AP/ETF-5 operates at 277 V AC. Substitute parts operating at 250 V AC represent a voltage derating of 27 V from the original specification. Substitutes with 250 V AC ratings are electrically compatible for applications where the circuit voltage does not exceed 250 V AC.

Dimensional Compatibility: The AP/ETF-5 measures 0.329" Dia x 0.303" H (8.35mm x 7.70mm). Substitute parts with identical dimensions ensure mechanical compatibility with existing PCB footprints and mounting hardware.

Parameter Comparison

Engineering Selection Recommendations

MRT 5-BULK and MRT 5-AMMO (Bel Fuse Inc.): These parts are preferred substitutes for the AP/ETF-5. Both maintain identical current rating (5 A), package dimensions (0.329" Dia x 0.303" H), and operating temperature range (-55°C ~ 125°C). The voltage rating of 250 V AC represents a derating from the original 277 V specification; these substitutes are suitable for applications where circuit voltage does not exceed 250 V AC. Both parts carry active product status and hold comprehensive international approvals including AEC-Q200, CCC, CE, CSA, cURus, PSE, SEMKO, and VDE. ROHS3 compliance and REACH unaffected status provide regulatory alignment for current manufacturing standards.

SR-5-5A-AP (Eaton - Electronics Division): This part maintains the same manufacturer as the original AP/ETF-5 and shares identical current rating (5 A) and response characteristics. However, dimensional variance (0.335" Dia x 0.319" H versus 0.329" Dia x 0.303" H) may require PCB footprint verification. Operating temperature range is reduced to -40°C ~ 85°C compared to the original -55°C ~ 125°C specification. Voltage rating is 250 V AC. This part carries active product status with expanded international approvals.

Voltage Rating Consideration: All substitute parts operate at 250 V AC, which is 27 V lower than the original AP/ETF-5 specification of 277 V AC. Substitution is valid only for applications where the maximum circuit voltage does not exceed 250 V AC.

Dimensional Compatibility: MRT 5-BULK and MRT 5-AMMO maintain exact dimensional compatibility with the AP/ETF-5. SR-5-5A-AP exhibits dimensional variance and requires footprint verification before implementation.

Frequently Asked Questions (FAQ)

Q: Can the AP/ETF-5 be directly replaced with a 250 V AC rated fuse?

A: Substitution with 250 V AC rated fuses is valid only for applications where the circuit voltage does not exceed 250 V AC. The original AP/ETF-5 specification of 277 V AC indicates the maximum voltage the component can safely operate at. Using a 250 V AC substitute in a 277 V AC circuit exceeds the component's voltage rating and is not acceptable.

Q: What is the difference between MRT 5-BULK and MRT 5-AMMO?

A: Both parts are electrically and mechanically identical. The difference is packaging: MRT 5-BULK is supplied in bulk packaging, while MRT 5-AMMO is supplied in cut tape (CT) packaging. Selection depends on procurement and assembly process requirements.

Q: Does the dimensional difference between SR-5-5A-AP and AP/ETF-5 affect compatibility?

A: SR-5-5A-AP measures 0.335" Dia x 0.319" H, compared to AP/ETF-5 at 0.329" Dia x 0.303" H. This variance requires verification against the PCB footprint and mounting hole specifications. MRT 5-BULK and MRT 5-AMMO maintain exact dimensional compatibility and are preferred for direct replacement applications.

Q: Are all substitute parts RoHS compliant?

A: SR-5-5A-AP is RoHS Compliant. MRT 5-BULK and MRT 5-AMMO are ROHS3 Compliant. The original AP/ETF-5 does not specify RoHS status. All substitutes meet current regulatory requirements for RoHS compliance.

Q: What is the significance of AEC-Q200 approval on the Bel Fuse parts?

A: AEC-Q200 is an automotive electronics qualification standard. MRT 5-BULK and MRT 5-AMMO carry this approval, indicating qualification for automotive applications. This certification is not present on the original AP/ETF-5 or SR-5-5A-AP.

Q: Can the AP/ETF-5 be used in new designs?

A: The AP/ETF-5 is classified as obsolete. New designs should utilize active substitute parts: MRT 5-BULK, MRT 5-AMMO, or SR-5-5A-AP. Active product status ensures ongoing availability and manufacturing support.

Q: What is the breaking capacity difference between the original and substitutes?

A: The AP/ETF-5 has a breaking capacity of 100 A at rated voltage. All substitute parts have a breaking capacity of 50 A at rated voltage. This represents a reduction in fault current handling capability and must be evaluated against circuit protection requirements.