NH0G25 Equivalent & Substitute Parts

Part Overview

The NH0G25 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, making identification of compatible substitute parts essential for ongoing system maintenance and component procurement. The fuse is designed for motor protection applications and requires a dedicated holder for installation.

Substiute Parts

NH0G25

Littelfuse Inc.In Stock: 1101NH0G25 Datasheet

Current PartRFQ

25NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 82425NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NH0G25 is determined by the following critical parameters that must remain constant or compatible:

• Current Rating: Must be 25A to maintain circuit protection characteristics
• Fuse Class: Must be NH type to ensure compatibility with existing holder and circuit design
• Voltage Rating - AC: Must be 500 VAC minimum to support the primary operating voltage
• Response Time: Must be Fast Blow to match the original protection profile
• Package / Case: Must be Rectangular, Blade configuration for mechanical fit in existing holders
• Mounting Type: Must require holder installation, consistent with system design

The substitute part 25NHG000B meets these core substitution criteria. The DC voltage rating difference (250 VDC vs. 440 VDC) represents a reduction in maximum DC capability; however, this part remains functionally equivalent for applications where the DC voltage requirement does not exceed 250 VDC.

Parameter Comparison

Engineering Selection Recommendations

The 25NHG000B from Eaton - Bussmann Electrical Division is the identified substitute for the obsolete NH0G25. Selection of this substitute is supported by the following factors:

• Product Status: The 25NHG000B is active and currently in production, ensuring long-term availability and supply chain continuity
• Electrical Compatibility: Both parts maintain identical current rating (25A), AC voltage rating (500 VAC), response time (Fast Blow), and fuse class (NH)
• Mechanical Compatibility: Both parts use identical package configuration (Rectangular, Blade) and mounting type (Requires Holder), ensuring direct fit in existing installations
• Regulatory Compliance: The 25NHG000B carries VDE approval and is RoHS compliant, meeting modern regulatory requirements
• DC Voltage Consideration: The reduced DC voltage rating (250 VDC vs. 440 VDC) must be evaluated against the actual system operating conditions. If the application operates at or below 250 VDC, this substitute is fully equivalent. If DC operation exceeds 250 VDC, alternative substitutes must be identified

Frequently Asked Questions (FAQ)

Q: Can the 25NHG000B be used as a direct replacement for the NH0G25 in all applications?

A: The 25NHG000B is mechanically and electrically compatible for AC applications and DC applications operating at or below 250 VDC. If your system requires DC operation above 250 VDC, the reduced DC voltage rating of the substitute must be considered in your application assessment.

Q: Are there physical dimension differences between these two fuses?

A: Yes. The NH0G25 measures 2.760" L x 2.100" W x 1.181" H, while the 25NHG000B measures 2.126" L x 0.827" W x 1.693" H. Both use Rectangular, Blade package configuration and are compatible with NH-type holders, but physical dimensions differ. Verify holder compatibility before installation.

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

A: The NH0G25 is RoHS non-compliant, while the 25NHG000B is RoHS compliant. For new designs or systems subject to RoHS regulations, the 25NHG000B is the appropriate choice. For legacy system maintenance where RoHS compliance is not a requirement, either part may be used based on electrical compatibility.

Q: Why is the breaking capacity specification different between the two parts?

A: The NH0G25 specifies 120kA AC and 25kA DC breaking capacity, while the 25NHG000B specifies 120kA breaking capacity. Both meet the NH class standard for 25A fuses. The difference in DC specification reflects the reduced DC voltage rating of the 25NHG000B.

Q: Are both fuses approved by the same certification body?

A: Yes. Both the NH0G25 and 25NHG000B carry VDE approval, confirming compliance with European electrical safety standards.