NDD3B(JD-5B) Motor protector

NegotiableUpdate on September 07

Model

Nature of the Manufacturer: Manufacturer

Product Category: Motor protection control

Place of Origin: City, Province

Online Consult Contact Information

Overview

NDD3B(JD-5B) Motor protector

Product Details

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