NDX(XJ3 4 5) Phase break and phase sequence protective relays

Main technical parameters

1. Working power supply: three-phase 380V 50Hz, allowable fluctuation range is (90% ~ 110%) Ue.
2. Phase break protection: in the front end of voltage sampling signal,, of NDX series products, when any phase of three-phase power is cut off, the protector acts reliably and plays the role of phase break protection (NDX-B and C products only play the role of phase break protection when starting, but do not protect the phase break during working).
3. Phase sequence protection: After the identification of the protector's phase sequence, the motor will not start if any phase line is changed. The protector plays the role of phase sequence protection.
4. Voltage imbalance protection: When the asymmetry between the voltage of one phase and the voltage of the other two phases in the three-phase power supply is ≥13%, the protector shall act reliably and play A protective role (NDX-A, B and C have no such protection function).
5. Contact capacity: AC380V 5A;
NDX - C: AC380V 3 a)
6. Electric life: 1×105 times
7. Mechanical life: 1×106 times.
8. Installation method: device type.

The wiring diagram

Appearance and installation dimensions

Directions for use

1. Properly connected according to the wiring diagram, if the motor cannot start, the protector has been identified by phase sequence. The three-phase power supplies A, B and C input by the protector shall be changed to any phase, and the motor can start normally.
2. NDX series protective relays shall be used and stored in the place without corrosive gas, serious mold and dust.
3. When NDX-A and B relays are not powered on, their contacts 5 and 6 are disconnected;In the normal running state, its contacts 5 and 6 are connected;Its contacts 5 and 6 are disconnected in the protected state.
4. When NDX-C, D and E relays are not powered on, their contacts 5 and 6 are disconnected, and 7 and 8 are connected;In normal operation, its contacts 5 and 6 are connected, and 7 and 8 are disconnected.In the protected state, the contacts 5 and 6 are disconnected, and 7 and 8 are connected.