NH00CM80 Equivalent & Substitute Parts

Part Overview

The NH00CM80 is an 80A square fuse rated for 500 VAC and 440 VDC operation, manufactured by Littelfuse Inc. and classified as NH type with fast-blow response characteristics. This component is designated as obsolete product status, requiring identification of active equivalent alternatives for continued system support and procurement planning. Square fuses of this current and voltage rating are critical for motor protection applications in industrial electrical systems.

Substiute Parts

NH00CM80

Littelfuse Inc.In Stock: 1099NH00CM80 Datasheet

Current PartRFQ

80NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 78580NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 80NHG000B from Eaton - Bussmann Electrical Division qualifies as a direct substitute based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Current Rating: 80A (identical)
• Voltage Rating - AC: 500 VAC (identical)
• Fuse Type: Square (identical)
• Response Time: Fast Blow (identical)
• Class: NH (identical)
• Mounting Type: Requires Holder (identical)
• Package / Case: Rectangular, Blade (identical)
• Breaking Capacity @ Rated Voltage: 120kA AC (identical for AC rating)

Variance in DC Voltage Rating: The substitute part is rated for 250 VDC compared to the original 440 VDC specification. This represents a reduction in maximum DC voltage capability and must be evaluated against actual system operating conditions.

Parameter Comparison

Engineering Selection Recommendations

The 80NHG000B presents the primary active equivalent for the obsolete NH00CM80 based on matching electrical class, current rating, AC voltage specification, and fuse response characteristics. The substitute maintains VDE approval certification and achieves RoHS compliance status, addressing regulatory requirements that may apply to new system designs or component replacements.

The reduction in DC voltage rating from 440 VDC to 250 VDC requires evaluation against the actual DC operating voltage present in the target application. If the system operates exclusively at or below 250 VDC, the 80NHG000B provides direct functional equivalence. If the system requires 440 VDC DC rating capability, alternative sources must be consulted.

The 80NHG000B is currently in active production with documented inventory availability, supporting procurement continuity for applications requiring 80A square fuses in the NH class.

Frequently Asked Questions (FAQ)

Q: Can the 80NHG000B replace the NH00CM80 in all applications?

A: The 80NHG000B matches all critical electrical parameters except DC voltage rating. Substitution is valid only when the system DC operating voltage does not exceed 250 VDC. For applications requiring 440 VDC DC capability, the reduced rating of the substitute part makes it unsuitable.

Q: What is the significance of the NH fuse class designation?

A: NH class fuses are industrial-grade square fuses designed for high-breaking-capacity applications. Both the original and substitute parts carry this classification, ensuring compatibility with NH-type fuse holders and maintaining the same protection characteristics for motor and industrial electrical circuits.

Q: Are there physical dimension differences between these parts?

A: Yes. The NH00CM80 measures 2.126" L x 2.020" W x 0.787" H, while the 80NHG000B measures 2.126" L x 0.827" W x 1.693" H. Both are rectangular blade-type packages compatible with standard NH fuse holders, but the dimensional variance reflects different internal construction. Verify holder compatibility before installation.

Q: What does RoHS compliance mean for this substitution?

A: The 80NHG000B is RoHS compliant, meaning it contains no restricted hazardous substances. The original NH00CM80 is RoHS non-compliant. For new designs or systems subject to RoHS regulations, the 80NHG000B provides regulatory alignment.

Q: Is the breaking capacity equivalent between these parts?

A: The AC breaking capacity is identical at 120kA. The original part specifies 25kA DC breaking capacity, while the substitute lists only AC breaking capacity. This aligns with the reduced DC voltage rating of the substitute part.