0031.8221. The 0031.8221 from Schurter is a surface mount fuse holder for 5mm x 20mm fuses. Low profile fuse block with insulation walls Rated voltage is 250VAC (VDE) and 500V (UL/CSA) Rated current is 10A IEC 60127-6, UL 4248-1, CSA 22.2, VDE, CE and UL E39328 app