RBD-251 speed relay Karosa
The relay can be connected to the output from the impulse output sensor or at the output of the tachograph D3, B7. Relay closure occurs immediately upon arrival of the first pulse for input and output after 0.5 - 1s. The car's speed at which the relay is switched depends on the constant C.
The relay switch-off time can be set on request by the customer.