NH00CM4 Square Fuse 4A 500VAC/440VDC Equivalent & Substitute Parts

Part Overview

The NH00CM4 is a square fuse rated at 4A with 500VAC/440VDC voltage specifications, manufactured by Littelfuse Inc. This component is classified as obsolete, requiring identification of active equivalent parts for continued system support. The fast-blow response time and indicating feature make it suitable for motor protection applications. Due to its obsolete status, sourcing active alternatives is necessary for new designs and system maintenance.

Substiute Parts

NH00CM4

Littelfuse Inc.In Stock: 743NH00CM4 Datasheet

Current PartRFQ

4NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 10334NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 4NHG000B from Eaton - Bussmann Electrical Division qualifies as a direct substitute based on the following critical parameters:

• Current Rating: Both parts rated at 4A
• Voltage Rating - AC: Both rated at 500 VAC
• Fuse Type: Both are square fuses
• Response Time: Both are fast-blow
• Class: Both are NH class
• Mounting Type: Both require holder
• Package / Case: Both rectangular blade configuration
• Approval Agency: Both VDE approved

The primary difference is the DC voltage rating: NH00CM4 is rated 440VDC while 4NHG000B is rated 250VDC. This difference permits substitution in applications where the actual DC voltage requirement does not exceed 250VDC.

Parameter Comparison

Engineering Selection Recommendations

The 4NHG000B is the qualified substitute for NH00CM4 based on matching electrical and mechanical specifications across all critical parameters. The substitute part is currently active in production, ensuring availability for procurement and system integration.

The 4NHG000B offers improved compliance status with RoHS requirements, making it suitable for applications subject to environmental regulations. Selection of the substitute part is appropriate for applications where the system DC voltage requirement does not exceed 250VDC. For applications requiring the full 440VDC DC rating of the original part, alternative sourcing strategies must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can 4NHG000B directly replace NH00CM4 in all applications?

A: The 4NHG000B is electrically and mechanically compatible with NH00CM4 for applications where the actual DC voltage does not exceed 250VDC. The AC voltage rating of 500VAC and current rating of 4A are identical. Verify your system's DC voltage requirement before substitution.

Q: What is the significance of the different DC voltage ratings?

A: The NH00CM4 is rated for 440VDC while 4NHG000B is rated for 250VDC. This parameter defines the maximum DC voltage at which the fuse can safely interrupt a circuit. Selection must match or exceed the actual system voltage.

Q: Are the physical dimensions compatible?

A: Both parts use rectangular blade package configuration and require the same holder type. However, dimensional specifications differ: NH00CM4 measures 54.00mm L x 51.30mm W x 20.00mm H, while 4NHG000B measures 54.00mm L x 30.00mm W x 50.00mm H. Verify mechanical fit within your fuse holder before installation.

Q: What is the difference in RoHS compliance?

A: NH00CM4 is RoHS non-compliant while 4NHG000B is RoHS compliant. For applications subject to RoHS regulations or environmental standards, the 4NHG000B is the appropriate selection.

Q: Are both parts VDE approved?

A: Yes, both NH00CM4 and 4NHG000B carry VDE approval, confirming compliance with European electrical safety standards.