This part is a kind of semiconductor called 10D241K.
Function of this product has VARISTOR.
Manufacturers : Ceramate Technical
Image and pinout :
Some of the text within the PDF file :
SPECIFICATIONS PRODUCT： TYPE： MODEL： CITATION： REVISION： TOTAL PAGES： RELEASED DATE： VARISTOR GNR10D□□□K B01 5 Oct. 13, 2001 PAGE：1/5 REVISION HISTORY NO 1 2 3 4 5 6 7 8 9 10 11 12 REV. DATE Oct. 13, 2001 DCR NO. DESCRIPTION OF CHANGE NEW RELEASE REV. B01 Approved by Checked by Edited by Yu-Chang Huang Cloud Chen Andy Chiang TYPE CITATION SUBJECT GNR10D□□□K MODEL DATE PAGE 2/5 QUALITY APPROVAL and STRUCTURE REV. Oct. 13, 2001 B01 1. QUALITY SYSTEM APPROVAL ISO9001 Certificate of approval No.97-HOU-AQ-1382 2. SAFETY STANDARDS APPROVAL Standard No. File No. 180K〜680K 820K〜181K 201K〜471K 511K 561K〜821K 911K〜182K Approved Approved Approved Approved Approved Approved UL 1414 E181368 UL 1449 E166389 UL 497B E187844 Approved Approved Approv [ ... ]