NH00CG63 Square Fuse 63A 500VAC/440VDC Equivalent & Substitute Parts

Part Overview

The NH00CG63 is a square fuse rated for 63A at 500VAC/440VDC, manufactured by Littelfuse Inc. in the NH class. This component is designed for motor protection applications and features fast-blow response with an indicating function. The part is currently obsolete, making identification of compatible substitutes essential for maintenance and replacement applications. The NH00CG63 requires a dedicated fuse holder for installation and is approved by VDE certification standards.

Substiute Parts

NH00CG63

Littelfuse Inc.In Stock: 766NH00CG63 Datasheet

Current PartRFQ

63NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 84263NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NH00CG63 is determined by the following critical parameters:

• Current Rating: 63A (must match exactly)
• Voltage Rating - AC: 500VAC (must match exactly)
• Fuse Class: NH (must match exactly)
• Fuse Type: Square (must match exactly)
• Response Time: Fast Blow (must match exactly)
• Mounting Type: Requires Holder (must match exactly)
• Approval Agency: VDE (must match exactly)

The substitute part 63NHG000B meets all mandatory electrical and mechanical criteria for direct substitution. The DC voltage rating differs (250VDC vs. 440VDC on the original), which represents a reduced capability on the DC side. This difference is acceptable in applications where the DC voltage requirement does not exceed 250VDC.

Parameter Comparison

Engineering Selection Recommendations

The 63NHG000B from Eaton - Bussmann Electrical Division is the direct substitute for the obsolete NH00CG63. Both components share identical AC voltage ratings, current ratings, fuse class, response characteristics, and VDE approval. The substitute maintains active product status, ensuring continued availability and supply chain reliability.

The primary consideration is the reduced DC voltage rating of the substitute (250VDC versus 440VDC). Selection of the 63NHG000B is appropriate for applications where the maximum DC voltage does not exceed 250VDC. For applications requiring the full 440VDC DC rating, alternative sources must be consulted.

The 63NHG000B offers improved compliance status with RoHS requirements, making it suitable for new installations and modernization projects subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can the 63NHG000B replace the NH00CG63 in all applications?

A: The 63NHG000B is a direct substitute provided the application DC voltage requirement does not exceed 250VDC. Both components are NH class, 63A, 500VAC rated fuses with fast-blow response and VDE approval. Verify your circuit's maximum DC voltage before substitution.

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

A: NH class fuses are industrial-grade fuses designed for motor protection and general industrial applications. Both the main part and substitute maintain this classification, ensuring compatibility with NH-rated fuse holders and circuit protection schemes.

Q: Are the physical dimensions compatible between these parts?

A: Both components are square fuses requiring a dedicated holder. The NH00CG63 measures 2.126" L x 2.020" W x 0.787" H, while the 63NHG000B measures 2.126" L x 0.827" W x 1.693" H. Verify that your fuse holder accommodates the substitute's dimensions before installation.

Q: What is the difference in breaking capacity?

A: The NH00CG63 specifies 120kA AC and 25kA DC breaking capacity. The 63NHG000B specifies 120kA breaking capacity. Both exceed standard industrial requirements for 63A circuits at their respective voltage ratings.

Q: Does the RoHS compliance difference affect substitution?

A: The 63NHG000B is RoHS compliant while the NH00CG63 is not. For applications subject to environmental or regulatory compliance requirements, the substitute offers improved compliance status. For legacy systems without such requirements, both parts function identically from an electrical standpoint.