Motor Protection Relay
Description
Relay
Protection Relay
NJBK2 Motor Protection Relay
1.
General NJBK2 series motor protection relay (hereinafter referred to protector as simply) is applicable for overload, locked-rotor, phase-failure, three phase current unbalance, earthing and PTC temperature protection of AC motor @ A.
C.
50Hz, less than 660V rated operating voltage and 2A ~ 800A rated operating current for its continuous working or discontinuous working.
This product meets the requirements of IEC 60947- 4-1
2.
Type designation N JBK 2 - □/□□
Supply voltage Specification of rated current
Rated current of the casing
Design sequence No.
Motor protection relay
Company code
3.
Operation conditions 3.
1 Altitude ≤2000m.
3.
2 Ambient air temperature -5℃ ~ +40℃, with daily average ≤+35℃.
3.
3 Atmospheric condition: when the highest temperature is +40℃, relative humidity of air shall be no more than 50%, higher relative humidity shall be allowable at lower temperature.
The max monthly average relative humidity of the most humid month shall be not more than 90% and the lowest monthly average temperature of the same month should be no more than +25 ℃, condensed dew on surface of the product due to the change of the temperature should be taken into account.
3.
4 Pollution Level: Level 3.
3.
5 Installation Category: Ⅲ.
3.
6 Inclination between installation plane and vertical plane shall ≤±5°.
3.
7 At places without prominence rock, impact and vibration.
3.
8 At places without explosive risk, without gases that may be corrosive to metal or gases that may cause damage to the insulation, and with little conducting dust 3.
9 At places where rain & snow proof facilities are equipped with and not being full of steam.
4.
Technical data
4.
1 Main circuit: rated insulation voltage AC690V, rated frequency 50/60Hz.
Type
Rated Setting current Suitable motor
current (A) range (A)
power (kW)
NJBK2-200/10 NJBK2-200/50 NJBK2-200/200 NJBK2-400/400 NJBK2-800/800
10 50 200 400 800
2~10 10~50 40~200 160~400 320~800
1~5 5~25...
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