ECSR300 Equivalent & Substitute Parts Reference

Part Overview

The ECSR300 is a 300A 600VAC cylindrical fuse cartridge manufactured by Eaton - Bussmann Electrical Division. This component is designed for electrical and industrial applications requiring slow-blow response characteristics and operates within the RK5 fuse class. The part is currently active in production with full inventory availability. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when system requirements permit equivalent functionality.

Substiute Parts

ECSR300

Eaton - Bussmann Electrical DivisionIn Stock: 1107ECSR300 Datasheet

Current PartRFQ

FRS-R-300

Eaton - Bussmann Electrical DivisionIn Stock: 894FRS-R-300 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECSR300 is determined by the following critical parameters:

• Current Rating: 300A (exact match required)
• Voltage Rating - AC: 600 VAC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Response Time: Slow Blow (exact match required)
• Class: RK5 (exact match required)
• Physical Dimensions: 2.340" Dia x 11.630" L (exact match required)
• Approval Agencies: CE, CSA, UL certification (required)
• Breaking Capacity: 200kA minimum at rated voltage (required)

The FRS-R-300 meets all substitution criteria for AC applications. This part provides identical AC electrical specifications and physical form factor, with additional DC voltage capability that does not compromise AC performance.

Parameter Comparison

Engineering Selection Recommendations

Both the ECSR300 and FRS-R-300 are active products with identical certifications (CE, CSA, UL) and full RoHS compliance. Selection between these parts should be based on application requirements:

For AC-only applications operating at 600 VAC and 300A, either part is suitable. The ECSR300 provides a dedicated AC solution.

For applications requiring dual AC/DC capability, the FRS-R-300 offers extended voltage range (600 VAC / 300 VDC) while maintaining identical AC performance specifications and physical compatibility.

Both parts feature identical physical dimensions, enabling direct mechanical substitution in existing fuse holders. Both maintain the same breaking capacity of 200kA at rated AC voltage.

Frequently Asked Questions (FAQ)

Q: Can FRS-R-300 be used as a direct replacement for ECSR300 in AC applications?

A: Yes. The FRS-R-300 meets all AC electrical specifications (300A, 600 VAC), maintains identical RK5 class rating, breaking capacity (200kA), physical dimensions, and certifications (CE, CSA, UL). Physical form factor compatibility is confirmed.

Q: What is the primary difference between ECSR300 and FRS-R-300?

A: The FRS-R-300 includes additional DC voltage rating (300 VDC) with corresponding DC breaking capacity (20kA). AC specifications remain identical.

Q: Are physical dimensions identical between these parts?

A: Yes. Both parts measure 2.340" Dia x 11.630" L (59.44mm x 295.40mm) and use cylindrical form factor with blade terminals, ensuring compatibility with standard RK5 fuse holders.

Q: Do both parts carry the same regulatory approvals?

A: Yes. Both ECSR300 and FRS-R-300 carry CE, CSA, and UL certifications and are RoHS compliant.

Q: Can ECSR300 be used in DC applications?

A: The ECSR300 specifications provided do not include DC voltage rating. For DC applications, FRS-R-300 is specified for 300 VDC operation.