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NDD3B(JD-5B) Motor protector
NDD3B(JD-5B) Motor protector
NDD3B(JD-5B) Motor protector
NDD3B(JD-5B) Motor protector

NDD3B(JD-5B) Motor protector

Rated power supply voltage: AC380V AC220V 50Hz(other voltage classes can be customized)

Setting current range: 1A~5A 2A~10A 8A~40A 20A~100A 40A~160A 120A~300A 120A~400A

Action time of phase break: ≤6S(when the current of any one phase in the three-phase power supply is zero)

Reset time: control circuit power off reset, and reset time is not less than 300S

Contact capacity: 3AAC330V (resistance)

Installation: the device type is compatible with the guide type. The guide type is optional
                   the device type

Product overview

NDD3B series integrated motor protector (hereinafter referred to as protector) is suitable for AC 50Hz, rated working voltage AC380V and below power supply circuit to form a motor control circuit with AC contactor and other switching appliances. When the main circuit of the motor is in an abnormal working state such as phase failure or overload, the contacts of the switching device should be disconnected in time, and the three-phase power supply of the motor can be disconnected to quickly and reliably protect the motor. The protector adopts a potentiometer quantitative setting method, which directly adjusts the setting current of the protector according to the rated current calibrated on the motor nameplate, which is more convenient and intuitive than the setting method that does not have quantification and needs to start the motor setting, but cannot accurately tune to the motor rated current. . The protector adopts intelligent multi-segment inverse time protection technology under the control of overcurrent rate, and the inverse time limit has excellent performance continuous adjustable technology, which can meet the needs of various motors from light load to heavy load starting.
This series of protectors meet the GB14048.4 standard.

Wiring Diagram

Outline and installation dimension drawing

Overload protection inverse time characteristic diagram

Application circuit example

KM: AC contactor QA: start button TA: stop button H1 ~ H3 protector threaded hole
Note: The protector and ac contactor control power supply must be in phase

Main technical data

Table 1

Parameters

Model

NDD3B-AT

NDD3B-A

NDD3B-B

NDD3B-C

NDD3B-D

NDD3B-E

NDD3B-F

Rated power supply voltage

AC380V AC220V 50Hz (other voltage classes can be customized)

Setting current range 

1A~5A

2A~10A

8A~40A

20A~100A

40A~160A

120A~300A

120A~400A

Overload action time

shown in Table 2

Break phase action time 

≤6S (when any one phase current in three-phase power supply is zero)

Reset time

control circuit power off reset, and reset time is not less than 300S

Contact capacity 

3AAC330V (resistance)

Installation Mode

The device type is compatible with the guide type. The guide type is optional

Device type

The environment temperature

-5c ~55'C relative humidity, ≤90%RH

The altitude

≤2000m

Using the environment

In a gaseous environment not sufficient to corrode the metal and damage the insulation performance;No strong impact vibration, rain and snow

 

Table 2

Overload action time Tp

Tripping class code

1.05 times setting current 

 1.2 times setting Current

 1.5 times setting Current

 6 times setting Current

 7.2 times setting Current

2

Trip within 2 hours

Trip within 2 hours

TP≤30S

Tp≤2s

1s

5

Tp≤lmin

Tp≤5s

1s

10(10A)

Tp≤2min

Tp≤10s

2s

15(10)

Tp≤3min

Tp≤15s

4s

20(20)

Tp≤8min

Tp≤20s

6s

25

Tp≤9min

Tp≤25s

7.5s

30 (30)

Tp≤12min

Tp≤30s

9s

 

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