The ship was armed with a main battery of two SK L/40 guns in single gun turrets, one forward and one aft. The guns were supplied with 58 rounds of ammunition each. They had a range of . "Hansa" also carried a secondary battery of eight SK L/40 guns. Four were mounted in turrets amidships and the other four were placed in casemates, two abreast the conning tower and the others abreast the mainmast. These guns had a range of . She also carried ten SK L/35 guns for defense against torpedo boats. The gun armament was rounded out by ten Maxim machine cannon. She was also equipped with three torpedo tubes with eight torpedoes, two launchers were mounted on the broadside and the third was in the bow, all below the waterline.