FNW-12 Equivalent & Substitute Parts

Part Overview

The FNW-12 is a 12A 250VAC cartridge fuse manufactured by Eaton - Bussmann Electrical Division, classified as a slow-blow fuse in the 5AG package format. This component is designed for electrical and industrial applications requiring overcurrent protection with a 10kA breaking capacity at rated voltage. The FNW-12 is currently listed as obsolete, making identification of suitable substitute components essential for ongoing system maintenance and component procurement.

Substiute Parts

FNW-12

Eaton - Bussmann Electrical DivisionIn Stock: 1067FNW-12 Datasheet

Current PartRFQ

FNM-12

Eaton - Bussmann Electrical DivisionIn Stock: 2276FNM-12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FNW-12 is based on strict equivalence across the following critical parameters:

• Current Rating: 12A (exact match required)
• Voltage Rating: 250VAC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5AG, 10mm x 38mm (exact match required)
• Breaking Capacity: 10kA (exact match required)
• Approval Agencies: CE, CSA, UL (all certifications maintained)

The FNM-12 meets all substitution criteria as a direct equivalent component from the same manufacturer. The primary distinction is product status: FNW-12 is obsolete while FNM-12 is active, with improved availability and ongoing manufacturer support.

Parameter Comparison

Engineering Selection Recommendations

The FNM-12 is the direct substitute for the FNW-12. Both components maintain identical electrical and mechanical specifications, including current rating, voltage rating, response time, package format, and breaking capacity. Both components carry equivalent regulatory approvals (CE, CSA, UL) and maintain the same REACH and export classification status.

The primary advantage of selecting FNM-12 is active product status with established supply chain availability. The FNW-12, being obsolete, presents procurement challenges and limited inventory access. The FNM-12 is manufactured by the same division of Eaton and provides functional equivalence for direct replacement in existing applications.

Frequently Asked Questions (FAQ)

Q: Can FNM-12 be used as a direct replacement for FNW-12?

A: Yes. The FNM-12 is electrically and mechanically equivalent to the FNW-12. Both components share identical current rating (12A), voltage rating (250VAC), fuse type (cartridge), response time (slow blow), package format (5AG, 10mm x 38mm), and breaking capacity (10kA). Both maintain CE, CSA, and UL approvals.

Q: What is the difference between FNW-12 and FNM-12?

A: The primary difference is product status. FNW-12 is obsolete, while FNM-12 is active. The FNM-12 offers improved availability and ongoing manufacturer support. Dimensional tolerance on length is marginally different (38.00mm vs 38.10mm), which is within acceptable mechanical tolerance for cartridge fuse holders.

Q: Are there any compatibility concerns when substituting FNM-12 for FNW-12?

A: No compatibility concerns exist. Both components are designed for the same holder type and mounting configuration. The 5AG package format and 10mm x 38mm dimensions ensure mechanical fit in existing fuse holders designed for the FNW-12.

Q: Do both components meet the same regulatory requirements?

A: Yes. Both FNW-12 and FNM-12 carry identical regulatory approvals: CE, CSA, and UL. Both maintain REACH Unaffected status and EAR99 export classification.

Q: Which component should be selected for new designs?

A: FNM-12 should be selected for new designs due to active product status and established supply chain availability. The component provides identical functional performance with superior procurement reliability.