CH143D Cartridge Fuse Holder 40A 600V DIN Rail

Part Overview

The CH143D is a cartridge fuse holder manufactured by Eaton - Bussmann Electrical Division, designed for 40A 600V applications with three circuits on DIN rail mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for system maintenance, repair, and new installations where legacy specifications must be maintained or upgraded.

Substiute Parts

CH143D

Eaton - Bussmann Electrical DivisionIn Stock: 1223CH143D Datasheet

Current PartRFQ

CYH14513Z

Littelfuse Inc.In Stock: 839CYH14513Z Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CH143D is determined by the following critical parameters:

• Fuse Size Compatibility: 14mm x 51mm cartridge format (0.551" Dia x 2.008" L)
• Mounting Configuration: DIN rail mounting
• Circuit Count: 3-circuit configuration
• Termination Interface: Screw terminal connection
• Voltage Class: Minimum 600V rating
• Current Capacity: Minimum 40A rating

The CYH14513Z from Littelfuse Inc. meets all mechanical and electrical compatibility criteria. While it operates at a higher voltage rating (690V) and current capacity (50A), these parameters represent acceptable upgrades that do not compromise system safety or performance in 600V 40A applications. The identical fuse size, DIN rail mounting, 3-circuit design, and screw terminal termination ensure direct mechanical and electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The CH143D is obsolete and no longer manufactured by Eaton - Bussmann. The CYH14513Z from Littelfuse Inc. is the qualified substitute, offering active product status with current manufacturing support and availability.

Electrical Compatibility: The CYH14513Z exceeds the CH143D specifications in both voltage (690V vs. 600V) and current capacity (50A vs. 40A). These higher ratings ensure the substitute operates safely within the original application envelope without derating or performance compromise.

Mechanical Compatibility: Both holders accept identical 14mm x 51mm cartridge fuses, mount on DIN rail, provide 3-circuit configuration, and utilize screw terminal termination. No mechanical modification or adapter is required.

Compliance and Availability: The CYH14513Z maintains equivalent REACH and ECCN classifications. With 754 units in stock versus the CH143D's obsolete status, the Littelfuse substitute ensures supply chain continuity and long-term availability for maintenance and new installations.

Frequently Asked Questions (FAQ)

Q: Can the CYH14513Z directly replace the CH143D without modification?

A: Yes. Both holders accept 14mm x 51mm cartridge fuses, mount identically on DIN rail, feature 3-circuit design, and use screw terminal connections. No mechanical or electrical modification is required.

Q: Why does the CYH14513Z have a higher voltage rating (690V vs. 600V)?

A: Higher voltage ratings indicate enhanced dielectric strength and safety margin. Operating a 690V-rated holder in a 600V application is standard engineering practice and does not create compatibility issues.

Q: Why does the CYH14513Z have a higher current rating (50A vs. 40A)?

A: Higher current capacity indicates larger contact surfaces and improved thermal performance. Using a 50A-rated holder in a 40A application provides additional safety margin and does not compromise system performance.

Q: Are there any compliance differences between the two parts?

A: Both parts share identical REACH and ECCN classifications (REACH Unaffected, EAR99). The CYH14513Z is RoHS non-compliant, consistent with industrial fuse holder standards for this voltage and current class.

Q: What is the key difference between these two fuse holders?

A: The primary difference is manufacturer and product status. The CH143D (Eaton) is obsolete; the CYH14513Z (Littelfuse) is active production. Electrically and mechanically, the CYH14513Z meets or exceeds all CH143D specifications.

Q: Can I use the CYH14513Z in legacy systems designed for the CH143D?

A: Yes. The identical fuse size, mounting method, circuit count, and termination style ensure full compatibility in any application originally specified for the CH143D.