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American Standard Semiconductor Fuses in Accordance with BS 88, NH1 to NH3

DENCO's American Standard semiconductor fuses are made in accordance with BS 88 in sizes NH1 to NH3. The catalog lists two voltage classes, 690V/800V and 1000V/1300V, each from 40A to 1600A. They are current limiting with a high interrupting rating, low watts loss and a silver element.

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The 690V/800V fuses take two catalog pages. Page 113 lists D4178, D5178, D6178 and D7178, and D4228, D5228, D6228 and D7228; page 114 lists D4328, D5328, D6328 and D7328, and D4278, D5278, D6278 and D7278. Both pages offer the fuse without an indicator or with indicator type "F" for a microswitch base.

The 1000V/1300V fuses on page 125 (D4258 to D7258 and D4308 to D7308) are offered with a visual indicator or with indicator type "F" for a microswitch base. Each page prints its own electrical characteristics table.

Specifications

American Standard (BS 88) NH semiconductor fuses: ratings as printed in the DENCO catalog
ParameterValue
690V/800V40A to 1600A, NH1 to NH3
1000V/1300V40A to 1600A, NH1 to NH3
Interrupting rating200kA AC, 100kA DC
Indicators, 690V/800VWithout indicator, or type F for microswitch base
Indicators, 1000V/1300VVisual indicator, or type F for microswitch base

Construction and options

  • Current limiting
  • High interrupting rating
  • Low watts loss
  • Silver element
  • Indicator type F for microswitch base

Catalog numbers in this series

Catalog numbers — January 2025 catalog pp.98, 113–114, 125 (24 total)
Catalog no.AvailabilityLast reviewed
D4178Active2026-08-27
D5178Active2026-08-27
D6178Active2026-08-27
D7178Active2026-08-27
D4228Active2026-08-27
D5228Active2026-08-27
D6228Active2026-08-27
D7228Active2026-08-27
D4328Active2026-08-27
D5328Active2026-08-27
D6328Active2026-08-27
D7328Active2026-08-27
D4278Active2026-08-27
D5278Active2026-08-27
D6278Active2026-08-27
D7278Active2026-08-27
D4258Active2026-08-27
D5258Active2026-08-27
D6258Active2026-08-27
D7258Active2026-08-27
D4308Active2026-08-27
D5308Active2026-08-27
D6308Active2026-08-27
D7308Active2026-08-27

Standards and equivalents

  • American Standard in accordance with BS 88
  • American Standard in accordance with BS 88 (1000V/1300V)

Wording is the catalog’s own. “In accordance with” a standard is not the same as certified or listed to it.

Curves and drawings

The catalog prints the following for this series: electrical characteristics tables. This series is on pp.98, 113–114, 125 of the January 2025 DENCO catalog. Access the catalog or ask for the drawing or curve you need.

Technical review

Specifications on this page are quoted from DENCO’s product catalog. Confirm any rating against DENCO engineering before specifying.

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