Equivalent & Substitute Parts for 25SFMSJ50

Part Overview

The 25SFMSJ50 is a 50A 25 kVAC cartridge fuse manufactured by Eaton - Bussmann Electrical Division. This component is classified as obsolete, indicating it is no longer in active production. For applications requiring this fuse type, substitute parts meeting equivalent electrical and mechanical specifications are necessary to maintain system functionality and ensure continued availability.

Substiute Parts

25SFMSJ50

Eaton - Bussmann Electrical DivisionIn Stock: 94125SFMSJ50 Datasheet

Current PartRFQ

24TDMEJ50

Eaton - Bussmann Electrical DivisionIn Stock: 111824TDMEJ50 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 25SFMSJ50 is based on the following critical parameters:

• Current Rating: 50A (must match exactly)
• Fuse Type: Cartridge (must match exactly)
• Mounting Type: Requires Holder (must match exactly)
• Physical Dimensions: 2.992" Dia x 17.402" L (must accommodate holder compatibility)
• Voltage Rating: AC voltage compatibility within system design limits
• RoHS Compliance: Maintained across substitutes

The substitute part 24TDMEJ50 maintains the same current rating (50A), fuse type (cartridge), and mounting requirements. While the voltage rating differs (24 kVAC vs. 25 kVAC), the physical dimensions remain compatible with standard cartridge fuse holders. The substitute offers improved breaking capacity (50 kA vs. 25 kA) and active product status with VDE approval.

Parameter Comparison

Engineering Selection Recommendations

The 25SFMSJ50 is obsolete and no longer manufactured. The 24TDMEJ50 is the designated manufacturer substitute, offering active product status and continued availability. Both components are RoHS compliant and manufactured by the same supplier.

The 24TDMEJ50 provides enhanced breaking capacity (50 kA vs. 25 kA) and carries VDE approval. The voltage rating difference (24 kVAC vs. 25 kVAC) reflects the substitute's design specifications. Physical dimensions differ in diameter (54mm vs. 76mm), though both maintain the same length (442mm) and are compatible with standard cartridge fuse holders.

Selection of the 24TDMEJ50 is supported by manufacturer designation, active production status, and regulatory compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the 24TDMEJ50 directly replace the 25SFMSJ50 in existing installations?

A: Both components are 50A cartridge fuses requiring a holder. The 24TDMEJ50 has a smaller diameter (54mm vs. 76mm) but maintains the same length (442mm). Compatibility depends on the specific holder design. Verify holder specifications before substitution.

Q: What is the significance of the voltage rating difference (25 kVAC vs. 24 kVAC)?

A: The voltage rating indicates the maximum AC voltage at which the fuse is rated to operate. The 24TDMEJ50 is rated for 24 kVAC operation. Application voltage requirements must not exceed this rating.

Q: Why does the 24TDMEJ50 have a higher breaking capacity?

A: Breaking capacity (50 kA vs. 25 kA) represents the maximum fault current the fuse can safely interrupt. The 24TDMEJ50's higher breaking capacity reflects its design specifications and provides enhanced fault protection capability.

Q: Are both parts RoHS compliant?

A: Yes, both the 25SFMSJ50 and 24TDMEJ50 are RoHS compliant, meeting environmental and material restriction requirements.

Q: What is the inventory status for these parts?

A: The 25SFMSJ50 has 867 pieces in stock (obsolete status). The 24TDMEJ50 has 1064 pieces in stock (active status), ensuring continued availability for new orders and replacements.