NH1CG40 Square Fuse 40A 500VAC/440VDC Equivalent & Substitute Parts

Part Overview

The NH1CG40 is a square fuse rated for 40A at 500VAC/440VDC, manufactured by Littelfuse Inc. This component is classified as obsolete, requiring identification of suitable alternatives for ongoing applications. The part features fast-blow response characteristics and is designed for motor protection applications with VDE approval. Due to its obsolete status, substitute parts with equivalent electrical and mechanical specifications are necessary for system continuity and procurement.

Substiute Parts

NH1CG40

Littelfuse Inc.In Stock: 1199NH1CG40 Datasheet

Current PartRFQ

40NHG01B

Eaton - Bussmann Electrical DivisionIn Stock: 74540NHG01B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NH1CG40 is based on the following critical parameters that must remain constant or compatible:

• Current Rating: 40A (exact match required)
• Voltage Rating - AC: 500VAC (exact match required)
• Fuse Type: Square (exact match required)
• Class: NH (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Package / Case: Rectangular, Blade (exact match required)

The substitute part 40NHG01B meets all mandatory electrical and mechanical criteria. The DC voltage rating differs (250VDC vs. 440VDC on the original), which represents a reduced capability. This substitution is valid only for applications where the DC voltage requirement does not exceed 250VDC.

Parameter Comparison

Engineering Selection Recommendations

The 40NHG01B from Eaton - Bussmann Electrical Division is the identified substitute for the obsolete NH1CG40. Selection of this substitute is supported by the following factors:

• Active product status ensures ongoing availability and supply chain continuity
• RoHS compliance of the 40NHG01B provides environmental and regulatory alignment
• Identical current rating, AC voltage rating, fuse type, class, response time, and mounting configuration ensure functional equivalence
• VDE approval maintained on both parts
• Identical breaking capacity at rated AC voltage

The primary consideration for substitution is the reduced DC voltage rating of the 40NHG01B (250VDC versus 440VDC). This substitute is suitable only for applications where the maximum DC voltage does not exceed 250VDC. For applications requiring the full 440VDC DC rating, alternative substitutes must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the 40NHG01B directly replace the NH1CG40 in all applications?

A: The 40NHG01B is electrically and mechanically compatible with the NH1CG40 for AC applications and DC applications up to 250VDC. Applications requiring DC voltage operation above 250VDC require evaluation of alternative substitutes.

Q: What are the physical dimensions of these fuses?

A: The NH1CG40 measures 2.953" L x 2.220" W x 1.181" H (75.00mm x 56.40mm x 30.00mm). The 40NHG01B measures 2.953" L x 1.181" W x 1.969" H (75.00mm x 30.00mm x 50.00mm). Both fuses use rectangular blade packaging and require a compatible holder.

Q: Are both fuses VDE approved?

A: Yes, both the NH1CG40 and 40NHG01B carry VDE approval.

Q: What is the difference in RoHS compliance?

A: The NH1CG40 is RoHS non-compliant, while the 40NHG01B is RoHS compliant. For applications subject to RoHS regulations, the 40NHG01B is the appropriate selection.

Q: What is the breaking capacity of these fuses?

A: The NH1CG40 has a breaking capacity of 120kA AC and 25kA DC at rated voltage. The 40NHG01B has a breaking capacity of 120kA at rated voltage.

Q: Do these fuses require special holders?

A: Yes, both fuses require compatible NH-class square fuse holders for installation. The blade configuration is standard across both parts.