NH1CG25 Equivalent & Substitute Parts

Part Overview

The NH1CG25 is a 25A 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 designated as obsolete product status, requiring identification of active equivalent parts for continued system support and procurement planning. Square fuses of this specification are used in motor protection and industrial electrical applications where high breaking capacity and indicating features are required.

Substiute Parts

NH1CG25

Littelfuse Inc.In Stock: 983NH1CG25 Datasheet

Current PartRFQ

25NHG01B

Eaton - Bussmann Electrical DivisionIn Stock: 84025NHG01B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 25NHG01B from Eaton - Bussmann Electrical Division qualifies as a direct substitute based on the following alignment of critical electrical and mechanical parameters:

• Current Rating: Both parts rated at 25A
• 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
• Breaking Capacity: Both meet 120kA AC specification

The primary difference is the DC voltage rating: NH1CG25 is rated 440 VDC while 25NHG01B is rated 250 VDC. This represents a reduction in maximum DC voltage capability and must be evaluated against system requirements.

Parameter Comparison

Engineering Selection Recommendations

The 25NHG01B is the active equivalent for the obsolete NH1CG25. Selection of this substitute is supported by:

• Product Status: 25NHG01B maintains active status with current manufacturing and availability, whereas NH1CG25 is obsolete
• Compliance: 25NHG01B is RoHS compliant, meeting current environmental and regulatory requirements
• Electrical Compatibility: Matching current rating, AC voltage rating, fuse class, and response time ensure functional equivalence in AC-primary applications
• Mechanical Compatibility: Identical mounting requirements and package configuration allow direct physical substitution

DC voltage rating reduction from 440 VDC to 250 VDC must be evaluated against system DC operating conditions. If the application operates at DC voltages exceeding 250 VDC, this substitute is not suitable without additional circuit analysis.

Frequently Asked Questions (FAQ)

Q: Can the 25NHG01B directly replace the NH1CG25 in all applications?

A: Direct replacement is valid for AC-primary circuits operating at 500 VAC with 25A current requirements. For DC circuits, the system voltage must not exceed 250 VDC. If your application requires 440 VDC DC rating, alternative substitutes must be evaluated.

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

A: NH class fuses are industrial-grade square fuses designed for high breaking capacity applications. Both parts meet NH class specifications with 120kA AC breaking capacity, ensuring equivalent protection characteristics in industrial motor and electrical protection circuits.

Q: Are there physical dimension differences between these parts?

A: Both parts use rectangular blade package configuration. The 25NHG01B dimensions are 75.00mm L x 30.00mm W x 50.00mm H, while NH1CG25 dimensions are 75.00mm L x 56.40mm W x 30.00mm H. Verify holder compatibility before installation.

Q: Why is RoHS compliance important for this substitution?

A: RoHS compliance indicates the part meets current environmental regulations for hazardous substance restrictions. The 25NHG01B RoHS compliance status supports use in applications subject to environmental and regulatory requirements, whereas the obsolete NH1CG25 does not meet these standards.

Q: What is the fast-blow response time characteristic?

A: Fast-blow fuses respond quickly to overcurrent conditions, providing protection for circuits sensitive to transient surges. Both the NH1CG25 and 25NHG01B share this characteristic, maintaining equivalent protection response in motor protection and industrial electrical applications.