CZF-331 phase loss and unbalance detector CZF-331

Intended use
The phase loss sensor is designed to protect the motor  power supply from a three-phase network in the event of a voltage failure in at least one phase or voltage asymmetry between phases, which may result in motor damage. Action
Voltage failure in at least one, any phase  or Voltage unbalance [V] between the phases above the activation threshold will cause the motor to be switched off. The switch-off will take place with a delay of 4 seconds, which prevents accidental disconnection of the motor in the event of a momentary voltage drop. Reactivation will occur automatically when  voltage increase by 5V above the operating voltage  (i.e. the value of the voltage hysteresis). With the above anomalies, starting the engine is impossible. NOTE!
Use of two switchover contacts of the relay allows you to connect an additional device or controlled system, as well as a visual or audible signaling system informing about the activation of the relay, i.e. engine off.