If a power surge occurs and maximum temperature of the thermoblock is exceeded, the Fuse will pop, thus breaking the electrical current to disable the machine. Fuses For Jura A1-A5-A7-A9-C5-C9-C60-C65-D6-E8-E9-F7-F8-F9-J5-J6-J7-J9-S7-S8-S9-X90-X95-XS90-XS95-Z5-Z6-Z7-Z8-Z9-ENA-ENA Micro-GIGA Coffee Machines.