FNW-30 Equivalent & Substitute Parts Reference

Part Overview

The FNW-30 is a 30A 250VAC cartridge fuse manufactured by Eaton - Bussmann Electrical Division, classified as a 5AG (10mm x 38mm Midget) slow-blow fuse cartridge requiring a holder for installation. The part is currently obsolete, with 849 units available in new original stock. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary to ensure continued availability and system reliability for electrical and industrial applications requiring 30A protection at 250VAC.

Substiute Parts

FNW-30

Eaton - Bussmann Electrical DivisionIn Stock: 938FNW-30 Datasheet

Current PartRFQ

FNM-30

Eaton - Bussmann Electrical DivisionIn Stock: 864FNM-30 Datasheet

DirectRFQ

0FLM030.T

Littelfuse Inc.In Stock: 33490FLM030.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FNW-30 is determined by strict alignment with the following critical parameters:

• Current Rating: 30A (exact match required)
• Voltage Rating - AC: 250VAC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5AG, 10mm x 38mm Midget (exact match required)
• Breaking Capacity @ Rated Voltage: 10kA (exact match required)
• Mounting Type: Requires Holder (exact match required)

Two substitute parts meet these criteria: FNM-30 (Eaton - Bussmann Electrical Division, active status) and 0FLM030.T (Littelfuse Inc., active status). Both maintain identical electrical specifications and mechanical form factors, ensuring direct compatibility in applications originally designed for the FNW-30.

Parameter Comparison

Engineering Selection Recommendations

FNM-30 (Eaton - Bussmann Electrical Division) is the direct equivalent substitute, maintaining identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. This part is recommended as the primary replacement for the obsolete FNW-30, particularly for applications requiring CE certification alongside CSA and UL approvals.

0FLM030.T (Littelfuse Inc.) provides an alternative substitute with identical AC voltage and current ratings, mechanical form factor, and breaking capacity. This part adds DC voltage capability (125VDC) not present in the original FNW-30 specification, providing extended application flexibility. It maintains active product status and ROHS3 compliance with CSA, PSE, QPL, and UL certifications. Selection between FNM-30 and 0FLM030.T depends on certification requirements specific to the end application and system design parameters.

Frequently Asked Questions (FAQ)

Q: Can FNM-30 be used as a direct replacement for FNW-30? A: Yes. FNM-30 maintains identical current rating (30A), AC voltage rating (250VAC), fuse type (Cartridge), response time (Slow Blow), package specification (5AG, 10mm x 38mm Midget), breaking capacity (10kA), and mounting requirements. Both parts are certified by CE, CSA, and UL. FNM-30 is active status with ROHS3 compliance.

Q: What is the difference between FNM-30 and 0FLM030.T? A: Both parts meet the core electrical and mechanical requirements of the FNW-30. The primary difference is that 0FLM030.T includes a 125VDC voltage rating in addition to the 250VAC rating, while FNM-30 specifies only 250VAC. Certification bodies differ slightly: FNM-30 includes CE certification, while 0FLM030.T includes PSE and QPL certifications. Both are ROHS3 compliant and active products.

Q: Are dimensional variations between these parts significant? A: Dimensional variations are minimal and within standard manufacturing tolerances. FNW-30 measures 10.30mm x 38.00mm, while FNM-30 and 0FLM030.T measure approximately 10.30-10.31mm x 38.10mm. These differences do not affect mechanical fit or electrical performance in standard 5AG cartridge fuse holders.

Q: Which substitute should be selected for new designs? A: For new designs, either FNM-30 or 0FLM030.T is appropriate based on application requirements. If DC voltage protection is needed, 0FLM030.T is the better choice. If CE certification is mandatory, FNM-30 is preferred. Both parts are active products with current manufacturing support and compliance certifications.

Q: Can these parts be used interchangeably in existing systems? A: Yes, within the constraints of the system's certification requirements and voltage specifications. Verify that the system's fuse holder is rated for 5AG cartridge fuses and that the application's voltage and current requirements match the 30A 250VAC specification. Consult system documentation for any specific certification or approval requirements.