NH00CG50 Equivalent & Substitute Parts

Part Overview

The NH00CG50 is a 50A square fuse rated for 500 VAC and 440 VDC operation, manufactured by Littelfuse Inc. This component is designed for motor protection applications and features fast-blow response characteristics with an indicating function. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing system maintenance and new designs requiring equivalent protection specifications.

Substiute Parts

NH00CG50

Littelfuse Inc.In Stock: 788NH00CG50 Datasheet

Current PartRFQ

50NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 75550NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NH00CG50 is determined by the following critical parameters that must remain constant or compatible:

• Current Rating: 50A (exact match required)
• Voltage Rating - AC: 500 VAC (exact match required)
• Fuse Type & Class: Square, NH class (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Approval Agency: VDE certification (required for equivalent protection)

The substitute part 50NHG000B meets these core criteria. The DC voltage rating differs (250 VDC vs. 440 VDC on the original), which represents a reduction in maximum DC voltage capability. This difference must be evaluated against the actual operating conditions of the application.

Parameter Comparison

Engineering Selection Recommendations

The 50NHG000B from Eaton - Bussmann Electrical Division is an active substitute for the obsolete NH00CG50. Both components share identical AC voltage ratings, current ratings, fuse class, response characteristics, and VDE approval.

The primary consideration is the DC voltage rating differential: the substitute part is rated for 250 VDC maximum, compared to 440 VDC for the original. Selection of the 50NHG000B is appropriate only when the application's DC operating voltage does not exceed 250 VDC.

The 50NHG000B offers the additional advantage of RoHS compliance, making it suitable for applications subject to environmental and regulatory requirements. The active product status ensures ongoing availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 50NHG000B replace the NH00CG50 in all applications?

A: The 50NHG000B is a direct substitute for AC applications and DC applications operating at or below 250 VDC. If the original application requires 440 VDC DC voltage capability, the 50NHG000B is not suitable without circuit redesign.

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

A: NH class fuses are industrial-grade fuses designed for high breaking capacity applications. Both the original and substitute parts maintain this classification, ensuring equivalent protection characteristics in motor protection circuits.

Q: Are the physical dimensions compatible?

A: Both parts are square fuses requiring a holder and use rectangular blade packaging. However, dimensional differences exist (54.00mm L × 51.30mm W × 20.00mm H for NH00CG50 versus 54.00mm L × 21.00mm W × 43.00mm H for 50NHG000B). Verify holder compatibility before installation.

Q: What does "Fast Blow" response mean?

A: Fast Blow fuses are designed to open quickly under overcurrent conditions, providing rapid circuit protection. Both the original and substitute parts share this characteristic, maintaining equivalent protection response times.

Q: Is RoHS compliance a factor in substitution?

A: RoHS compliance is not a substitution requirement but rather an additional benefit of the 50NHG000B. If the application or end-use market requires RoHS-compliant components, the substitute part meets this requirement while the original does not.