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

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

Summarize

NDX series phase break and phase sequence protective relays (hereinafter referred to as protectors) are suitable for ac 50Hz, 380V power supply circuit and ac contortionists and other switching electrical control circuit.When the main circuit of the motor appears abnormal state of wrong phase, broken phase, voltage imbalance, etc., it will disconnect the three-phase power supply of the motor in time, which can protect the motor quickly and reliably.
The protector adopts voltage sampling mode, which has nothing to do with the power of the motor and does not require any current level setting and adjustment.The machine has the advantages of wide application range, simple and convenient use, stable and reliable performance, etc

 

Specifications

Model

Protection function

Indicating device

Contact number

NDX-A

Phase sequence protection

NO

A normally open

NDX-B

Phase sequence protection

NO

A normally open

NDX-C

Phase break protection,

The work indicator light is on and the product is

in a protected state

1NO 1NC

NDX-D

Open phase protection

Phase sequence protection

Voltage imbalance

protection

The working indicator is in the green state, and the product is in the normal running state

The work indicator is in the red state, and the product is in the protected state

NDX-E

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.

Message feedback

News Center

> Return to work in the disease

On February 26, the production of NPOWER Group resumed. The director and manager of our company personall...

> Resistance to disease

This year Spring Festival, the sudden outbreak of the new champions league, brought unprecedented challen...