NH00CM50 Equivalent & Substitute Parts

Part Overview

The NH00CM50 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 component procurement.

Substiute Parts

NH00CM50

Littelfuse Inc.In Stock: 1141NH00CM50 Datasheet

Current PartRFQ

50NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 75550NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the NH00CM50 is determined by the following critical parameters:

• Current Rating: Must be 50A
• Fuse Type: Must be Square
• Class: Must be NH
• Response Time: Must be Fast Blow
• Mounting Type: Must require holder
• Voltage Rating - AC: Must be 500 VAC minimum
• Voltage Rating - DC: Must be 440 VDC or higher

The substitute part 50NHG000B meets the primary electrical and mechanical requirements. However, the DC voltage rating differs: the substitute is rated for 250 VDC compared to the original 440 VDC specification. This represents a reduction in DC voltage capability and must be evaluated against the specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 50NHG000B from Eaton - Bussmann Electrical Division is an active product with current manufacturing support and RoHS compliance, addressing the obsolescence status of the NH00CM50. Both components share identical current ratings, AC voltage specifications, fuse class, response characteristics, and VDE approval.

The primary consideration for substitution is the reduced DC voltage rating of the 50NHG000B (250 VDC versus 440 VDC). Selection of this substitute is appropriate only when the application operates at or below 250 VDC. For applications requiring the full 440 VDC DC rating of the original component, alternative substitutes with matching DC voltage specifications must be identified.

The improved RoHS compliance status of the 50NHG000B provides environmental and regulatory advantages for new system designs and long-term component availability.

Frequently Asked Questions (FAQ)

Q: Can the 50NHG000B be used as a direct replacement for the NH00CM50?

A: The 50NHG000B is functionally equivalent for AC applications and DC applications up to 250 VDC. If your system operates exclusively within these voltage parameters, substitution is appropriate. If DC operation at 440 VDC is required, this substitute is not suitable.

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

A: NH class fuses are industrial-grade square fuses designed for high-breaking-capacity applications. Both the original and substitute parts maintain this classification, ensuring compatibility with NH-rated fuse holders and equivalent protection characteristics.

Q: Does the physical size difference between these parts affect compatibility?

A: Both components are square fuses requiring a holder and share the same mounting interface requirements. The dimensional differences listed do not affect holder compatibility, as both are designed for standard NH fuse holders.

Q: What is the advantage of the RoHS-compliant substitute?

A: RoHS compliance ensures the component meets environmental regulations for hazardous substance restrictions. The 50NHG000B's compliance status provides regulatory alignment for systems subject to environmental standards and improves long-term component availability.

Q: How do the breaking capacities compare?

A: The original NH00CM50 specifies 120kA AC and 25kA DC breaking capacity. The 50NHG000B specifies 120kA breaking capacity. For applications requiring the full 25kA DC breaking capacity specification, this parameter difference should be evaluated against system requirements.