NH00CM25 Square Fuse 25A 500VAC/440VDC Equivalent & Substitute Parts

Part Overview

The NH00CM25 is a square fuse rated for 25A at 500VAC/440VDC, 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

NH00CM25

Littelfuse Inc.In Stock: 891NH00CM25 Datasheet

Current PartRFQ

25NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 82425NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NH00CM25 is determined by strict equivalence across the following parameters:

• Current Rating: 25A (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)
• Approval Agency: VDE (exact match required)

The substitute part 25NHG000B meets all mandatory equivalence criteria. The DC voltage rating differs (250VDC vs. 440VDC on the original), which represents a reduced capability. This difference must be evaluated against the specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 25NHG000B from Eaton - Bussmann Electrical Division is an active substitute for the obsolete NH00CM25. Selection is based on the following factors:

• Product Status: The 25NHG000B is active, ensuring continued availability and supply chain stability compared to the obsolete NH00CM25.
• Electrical Equivalence: Current rating, AC voltage rating, fuse class, response time, and breaking capacity at rated AC voltage are equivalent.
• Regulatory Compliance: Both parts carry VDE approval. The 25NHG000B achieves RoHS compliance, whereas the NH00CM25 is non-compliant.
• DC Voltage Consideration: The 25NHG000B has a reduced DC voltage rating of 250VDC compared to the original 440VDC. Applications operating at DC voltages exceeding 250VDC require evaluation of this parameter against system requirements.

Frequently Asked Questions (FAQ)

Q: Can the 25NHG000B directly replace the NH00CM25 in all applications?

A: The 25NHG000B is electrically equivalent for AC applications and DC applications up to 250VDC. If the original system operates at DC voltages between 250VDC and 440VDC, the reduced DC rating must be evaluated against application requirements.

Q: Are the physical dimensions compatible?

A: Both parts are square fuses requiring a holder. Physical dimensions differ: NH00CM25 is 2.126" L x 2.020" W x 0.787" H, while 25NHG000B is 2.126" L x 0.827" W x 1.693" H. Holder compatibility must be verified for the specific mounting application.

Q: What is the significance of the RoHS compliance difference?

A: The 25NHG000B is RoHS compliant, meeting current environmental and regulatory standards. The NH00CM25 is non-compliant. For new designs and systems subject to RoHS requirements, the 25NHG000B is the appropriate selection.

Q: Are both parts VDE approved?

A: Yes, both the NH00CM25 and 25NHG000B carry VDE approval, confirming compliance with European electrical safety standards.

Q: What is the availability status of each part?

A: The NH00CM25 is obsolete with 820 pieces in stock. The 25NHG000B is active with 753 pieces in stock, providing ongoing supply availability.