NH00CM40 Equivalent & Substitute Parts

Part Overview

The NH00CM40 is a 40A 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 designed for motor protection applications and features an indicating function with VDE approval. The part is currently listed as obsolete, making identification of suitable substitute components necessary for ongoing system maintenance and replacement requirements.

Substiute Parts

NH00CM40

Littelfuse Inc.In Stock: 1208NH00CM40 Datasheet

Current PartRFQ

170M1563D

Eaton - Bussmann Electrical DivisionIn Stock: 957170M1563D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 170M1563D from Eaton - Bussmann Electrical Division qualifies as a substitute based on the following critical parameters:

Matching Parameters:

• Current Rating: 40A (identical)
• Fuse Type: Square (identical)
• Package / Case: Rectangular, Blade (identical)
• Mounting Type: Requires Holder (identical)
• Features: Indicating (identical)

Voltage Consideration: The substitute operates at 690 VAC, which exceeds the NH00CM40's 500 VAC rating. In applications where the system voltage does not exceed 500 VAC, the 170M1563D provides higher voltage margin and is therefore suitable. The substitute does not include a DC voltage rating specification; applications requiring DC operation at 440 VDC must evaluate this limitation against system requirements.

Breaking Capacity: The 170M1563D provides 200kA breaking capacity, which exceeds the NH00CM40's 120kA AC specification, offering improved fault protection capability.

Parameter Comparison

Engineering Selection Recommendations

The 170M1563D is suitable for AC applications operating at or below 500 VAC. The substitute's higher voltage rating (690 VAC) and increased breaking capacity (200kA) provide enhanced performance margins in AC circuits. The 170M1563D holds active product status with RoHS compliance and multiple international certifications (CE, CSA, UR), supporting long-term availability and regulatory alignment.

For applications requiring DC operation at 440 VDC, the absence of a specified DC voltage rating for the 170M1563D requires evaluation against specific system requirements. Physical dimensions differ between the two parts; holder compatibility must be confirmed before installation.

Frequently Asked Questions (FAQ)

Q: Can the 170M1563D replace the NH00CM40 in all applications? A: The 170M1563D is suitable for AC applications at or below 500 VAC. Applications requiring 440 VDC operation must evaluate the substitute's DC capability, which is not specified in available data.

Q: What are the key differences between these fuses? A: Both fuses share identical current rating (40A), fuse type (square), and mounting requirements. The 170M1563D operates at higher AC voltage (690 VAC vs. 500 VAC) and provides greater breaking capacity (200kA vs. 120kA AC). Physical dimensions differ, requiring holder compatibility confirmation.

Q: Why is the NH00CM40 listed as obsolete? A: The NH00CM40 is classified as obsolete by the manufacturer. The 170M1563D is an active product with current availability and ongoing manufacturer support.

Q: Does the 170M1563D meet the same regulatory standards? A: The NH00CM40 carries VDE approval. The 170M1563D holds CE, CSA, and UR certifications. Both meet different but recognized international standards for electrical safety.

Q: Are the physical dimensions compatible with existing holders? A: Physical dimensions differ between the parts. The NH00CM40 measures 54.00mm x 51.30mm x 20.00mm, while the 170M1563D measures 53.00mm x 20.50mm x 52.00mm. Holder compatibility must be confirmed before installation.

Q: What is the melting I²t value for the NH00CM40? A: The melting I²t value is not specified for the NH00CM40. The 170M1563D specifies a melting I²t of 65.