NH0G100 Square Fuse 100A 500VAC/440VDC Equivalent & Substitute Parts

Part Overview

The NH0G100 is a square fuse rated for 100A 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 direct replacements from active product lines is necessary for maintenance and new installations.

Substiute Parts

NH0G100

Littelfuse Inc.In Stock: 916NH0G100 Datasheet

Current PartRFQ

100NHG000B

Eaton - Bussmann Electrical DivisionIn Stock: 3155100NHG000B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NH0G100 is based on the following critical parameters that must remain constant or compatible:

• Current Rating: 100A (exact match required)
• Voltage Rating - AC: 500VAC (exact match required)
• Fuse Class: NH (exact match required)
• Fuse Type: Square (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Package / Case: Rectangular, Blade (exact match required)
• Approval Agency: VDE certification (required for compliance)

The substitute part 100NHG000B meets these core substitution criteria. The DC voltage rating differs (250VDC vs. 440VDC on the original), which represents a design constraint of the substitute part. Selection must account for the specific DC voltage requirements of the application.

Parameter Comparison

Engineering Selection Recommendations

The 100NHG000B from Eaton - Bussmann Electrical Division is the active equivalent for the obsolete NH0G100. Both parts share identical current ratings, AC voltage ratings, fuse class, and physical package specifications. Both carry VDE approval certification.

The primary design difference is the DC voltage rating: the substitute part is rated for 250VDC compared to the original 440VDC. This difference must be evaluated against the actual DC voltage present in the application circuit. If the application operates at or below 250VDC, the 100NHG000B provides direct functional equivalence. If the application requires 440VDC DC rating, alternative sources or custom specifications must be investigated.

The 100NHG000B offers improved compliance status with ROHS3 certification, whereas the original NH0G100 is RoHS non-compliant. This compliance advantage supports modern procurement and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the 100NHG000B directly replace the NH0G100 in all applications?

A: Direct replacement is valid for applications operating at DC voltages of 250V or below. The substitute part maintains identical AC voltage rating (500VAC), current rating (100A), fuse class (NH), and physical package specifications. If the original application requires 440VDC operation, the reduced DC rating of the substitute must be evaluated against actual circuit requirements.

Q: Are the physical dimensions compatible between these parts?

A: Both parts use the same Rectangular, Blade package type and require the same holder mounting configuration. However, dimensional specifications differ: NH0G100 measures 2.760" L x 2.100" W x 1.181" H, while 100NHG000B measures 2.126" L x 0.827" W x 1.693" H. Verify that the fuse holder accommodates the substitute part's physical dimensions before installation.

Q: What is the significance of the VDE approval on both parts?

A: VDE certification indicates compliance with European electrical safety standards. Both the original and substitute parts carry this certification, supporting use in applications requiring European regulatory compliance.

Q: Does the ROHS3 compliance of the substitute part affect compatibility?

A: ROHS3 compliance on the 100NHG000B represents improved environmental and regulatory alignment compared to the non-compliant NH0G100. This does not affect electrical or mechanical compatibility; it represents an advantage for modern procurement requirements.

Q: What is the melting I²t value and why is it provided only for the substitute?

A: The melting I²t value (18100 for the 100NHG000B) characterizes the thermal energy required to melt the fuse element. This parameter is provided in the substitute part specification but not in the original part data. Both parts are fast-blow fuses suitable for motor protection, indicating similar response characteristics despite the difference in documented I²t values.