EF400 Equivalent & Substitute Parts Reference

Part Overview

The EF400 is a 400A 550 VAC fuse cartridge with bolt mount configuration, manufactured by Eaton - Bussmann Electrical Division. This component is classified as obsolete, indicating that direct replacement from current production may not be available. The EF400 is designed for electrical and industrial applications requiring high-current protection in AC systems up to 550 VAC. Identifying equivalent substitute parts is necessary to maintain system functionality and ensure continued availability for maintenance and replacement scenarios.

Substiute Parts

EF400

Eaton - Bussmann Electrical DivisionIn Stock: 963EF400 Datasheet

Current PartRFQ

400P11C

Eaton - Bussmann Electrical DivisionIn Stock: 833400P11C Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EF400 is determined by the following critical parameters:

• Current Rating: Must match at 400A to ensure proper circuit protection
• Mounting Type: Must be Bolt Mount to ensure mechanical compatibility with existing installations
• Fuse Type: Must be Cartridge configuration
• Package / Case: Must be Cylindrical with Blade Terminal (Bolt) for physical fit
• Voltage Rating - AC: The substitute must support operation at or above 550 VAC

The 400P11C qualifies as a substitute based on these criteria. It maintains the same current rating (400A), mounting type (Bolt Mount), fuse type (Cartridge), and physical package configuration. The 400P11C provides enhanced voltage capability (600 VAC AC / 250 VDC) and improved breaking capacity (200kA), making it suitable for applications previously served by the EF400.

Parameter Comparison

Engineering Selection Recommendations

The 400P11C is the appropriate substitute for the obsolete EF400 based on the following factors:

• Product Status: The EF400 is obsolete, while the 400P11C is active production, ensuring long-term availability and supply chain continuity
• Electrical Compatibility: The 400P11C maintains the critical 400A current rating and bolt mount configuration required for direct functional replacement
• Enhanced Ratings: The 400P11C provides higher AC voltage rating (600 VAC vs. 550 VAC) and superior breaking capacity (200kA vs. 80kA), offering improved performance margins in the same physical form factor
• Compliance: The 400P11C carries CE and CSA certifications and is RoHS compliant, meeting current regulatory and environmental standards
• Physical Fit: The diameter remains identical (2.323"); the length difference of 0.107" (2.72mm) is minimal and typically accommodated within standard mounting clearances

Frequently Asked Questions (FAQ)

Q: Can the 400P11C be used as a direct replacement for the EF400?

A: Yes. The 400P11C maintains identical current rating (400A), mounting type (Bolt Mount), fuse type (Cartridge), and package configuration (Cylindrical, Blade Terminal). The higher voltage and breaking capacity ratings of the 400P11C are compatible with applications previously served by the EF400.

Q: What is the physical difference between these parts?

A: The diameter is identical at 2.323" (59.00mm). The 400P11C is 0.107" (2.72mm) longer than the EF400 (3.060" vs. 2.953" length). This minor length difference is typically accommodated within standard bolt mount installations.

Q: Does the higher voltage rating of the 400P11C affect compatibility?

A: No. A fuse rated for 600 VAC is suitable for applications operating at 550 VAC or lower. The higher rating provides additional safety margin and does not compromise performance in lower-voltage circuits.

Q: What certifications does the 400P11C carry?

A: The 400P11C is certified by CE and CSA, and is RoHS compliant. The EF400 certification status is not specified in available documentation.

Q: Are there inventory considerations for these parts?

A: The EF400 has 933 pieces in stock as new original inventory. The 400P11C has 781 pieces in stock. Both are available; however, the 400P11C is recommended for new installations and long-term planning due to its active product status.