UMF 250 Surface Mount Fuses Schurter UMF 250 Surface Mount Fuses, with quick-acting characteristics per IEC 60127-4/2, protect electronic systems from overcurrents and short-circuits. Five rated currents are available from .5A to 10A. The fuses feature high breaking capacity of up to 200A at rated voltage. Applications for the UMF 250 Surface Mount Fuses from Schurter include protection of power supplies, medical equipment, and devices for home and industrial use.