The ships of the class were 82.87m (271.88feet) long, had a beam of 15.06m (49.41feet), a draught of 4.93m (16.17feet), and had a displacement of 3,494 tons. The ships were equipped with 2 shaft reciprocating engines, which were rated at 4200ihp and produced a top speed of 15.5kn.
The ships had belt armour of 8inches and 7inches turret armour.
The main armament of the ships were two 9.4inches single gun turrets. Secondary armament included four single 15cm (06inches) guns and ten 5.7cm (02.2inches) single guns.
Herluf Trolle was laid down at the Copenhagen Navy Yard and launched on 1 January 1899. Olfert Fischer was also laid down at Copenhagen Navy Yard and was launched on 1 January 1902.
| Name | Builder | Laid down | Launched | Completed | Fate | ||
|---|---|---|---|---|---|---|---|
| Copenhagen Naval Yard | 20 Jul 1897 | 1 Sep 1899 | 7 Jun 1901 | data-sort-value="Apr 1932" | Stricken, Apr 1932 | ||
| Copenhagen Naval Yard | 20 Oct 1900 | 9 May 1903 | 31 May 1905 | data-sort-value="Oct 1936" | Stricken, Oct 1936 | ||
| Copenhagen Naval Yard | 24 Apr 1905 | 2 May 1908 | 24 Sep 1908 | data-sort-value="29 Aug 1943" | Scuttled during Operation Safari, 29 Aug 1943 |