Overcurrent protection relays in combination with circuit breakers are used primarily when conventional safety solutions are not possible, such as in high-current and high-voltage systems or in railway technology. They prevent electrical devices and systems from being damaged or destroyed by the harmful effects of excessive current in the event of short circuits or overload conditions. In contrast to many other conventional overcurrent protection solutions, many parameters can be configured with the MRS13R. In conjunction with circuit breakers, currents in the kA range can be switched and, in comparison to fuses, the switching state of overcurrent protection relays is reversible when the cause of the fault has been eliminated. One normally open and one normally closed relay contact, which are positively guided, are available as an output for 6 A, 240 V each. The single-channel overcurrent protection relay MRS13R reacts when the current exceeds a preset threshold for at least 6 ms and activates a positively driven relay. A circuit breaker can be triggered via the coupled make and break contacts and feedback about the triggering can be sent to a higher-level controller. An LED lights up red when an overcurrent is detected. The diagnostic input can also be used to specifically trigger the overcurrent shutdown without an overcurrent actually being present. This enables simple integration or diagnostic tests.