Multistage protective device for overcurrent- and overvoltage-protected transmission of electrical energy

A protective device for overcurrent- and overvoltage-protected transmission of electrical energy from a voltage terminal to an electrical load, wherein the voltage terminal comprises two poles, the protective device comprising:

• a first fuse circuit adapted to prevent a flow of a line current from the voltage terminal to the electrical load when said line current reaches a first nominal current;
• an overvoltage protection circuit connected downstream of the first fuse circuit and upstream of the electrical load, wherein the overvoltage protection circuit is adapted to electrically connect the poles of the voltage terminal when a voltage at the voltage terminal reaches a first voltage limit to force the line current to the first nominal current such that the first fuse circuit is triggered;
• and
• a second fuse circuit connected downstream of the overvoltage protection circuit and upstream of the electrical load, wherein the second fuse circuit is adapted to prevent the flow of the line current when said line current reaches a second nominal current, wherein the second nominal current is based at least in part on the electrical load.