RET-251 speed relay Karosa

The relay uses the low-speed D8 tachograph output. The relay closes at a speed of more than 3km / h and switches off at a speed of less than 2.5km / h. With continuous deceleration, the maximum relay delay (relay deactivation) is 1 - 1.5 s. The vehicle speed at which the relay is switched is independent of the constant C.