NH0G20 Equivalent & Substitute Parts

Part Overview

The NH0G20 is a 20A 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, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and component procurement. The fuse is designed for motor protection applications and requires a dedicated holder for installation.

Substiute Parts

NH0G20

Littelfuse Inc.In Stock: 1138NH0G20 Datasheet

Current PartRFQ

20NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 92820NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NH0G20 is based on maintaining electrical compatibility across the following critical parameters: current rating (20A), AC voltage rating (500 VAC), fuse class (NH), response time (fast blow), and physical form factor (square, rectangular blade package requiring holder). The DC voltage rating may vary within acceptable operational limits depending on circuit requirements. The substitute part 20NHG000B meets the primary electrical specifications while maintaining the same fuse class and physical mounting requirements.

Parameter Comparison

Engineering Selection Recommendations

The 20NHG000B from Eaton - Bussmann Electrical Division serves as a direct functional substitute for the obsolete NH0G20. Both components share identical current ratings, AC voltage specifications, fuse class designation, and physical form factors. The primary difference is the DC voltage rating: the substitute is rated for 250 VDC compared to the original 440 VDC specification. Selection of the 20NHG000B is appropriate for applications where the DC voltage requirement does not exceed 250 VDC. The substitute part carries active product status and RoHS compliance, providing advantages for long-term availability and regulatory alignment compared to the obsolete original component.

Frequently Asked Questions (FAQ)

Q: Can the 20NHG000B replace the NH0G20 in all applications? A: The 20NHG000B is electrically compatible for AC circuits and DC circuits not exceeding 250 VDC. If the original application requires 440 VDC DC rating, alternative substitutes with higher DC voltage ratings must be evaluated.

Q: What is the significance of the NH fuse class designation? A: NH class fuses are industrial-grade fuses designed for high breaking capacity and are standardized for use in industrial electrical systems. Both the original and substitute parts maintain this classification, ensuring compatibility with NH-type fuse holders and circuit protection schemes.

Q: Are there physical mounting differences between these parts? A: Both components are square fuses with rectangular blade packages requiring dedicated holders. Physical dimensions differ slightly, but both are designed for standard NH-type holder installations.

Q: What is the impact of RoHS compliance on component selection? A: The 20NHG000B is RoHS compliant, meeting environmental and regulatory requirements for new equipment designs and procurement. The original NH0G20 is non-compliant, which may restrict its use in applications subject to RoHS regulations.

Q: How do the breaking capacities compare? A: The NH0G20 specifies 120kA AC and 25kA DC breaking capacity. The 20NHG000B specifies 120kA breaking capacity. Both provide adequate protection for industrial motor protection applications within their respective voltage ratings.