1250A 3 Phase Moulded Case Circuit Breaker

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seat: Zhejiang
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Last update: 2019-10-25 07:49
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1. Description Of NS Series Moulded Case Circuit Breaker:

NS series moulded case circuit breaker is one of breaker which adopts international advanced design, manufacture technology to develop. The rated insulating voltage is 750V, suitable for AC 50Hz (60Hz), rated working voltage 690V or below, rated working current is 12.5A to 1250A of circuit and used in distributing electric energy, and non-frequent breaking in the normal conditions, protecting the equipment from overload, under voltage. Circuit breaker with rated frame current 400A or below, can be used in mousecage motor's non-frequent start, breaking during working, protecting motor from overload, short circuit, undervoltage, the product conforms to IEC60947-2 standard.


2. Working Environment:

♦ The altitude bellows 2,000m;

♦ Circuit breaker may be used between -25℃ and +70℃. For temperatures higher than 40℃ (65℃ for circuit breakers used to protect motor feeders), devices must be derated;

♦ It can withstand the impact from humid air, salt spray, oil mist and mold;

♦ It should be installed in places with no danger of explosion, no conductive dust, and no substance enough to corrode metal or damage the insulation;

♦ In places with no rain and snow erosion;

♦ Pollution degree 3;

♦ Installation category III.


3. Technical Data Of NS Series MCCB:

NS/ NSX Type

Pole number

Rated insulating voltage (V)

Rated operating voltage (V)

Rated ultimate short circuit breaking capacity Icu (KA) at 380/ 415V

Rated servies short circuit breaking capacity Ics at 380/ 415V (KA)

Operation performance

Utilization category

ON

OFF

NS/NSX-100N

3, 4 pole

750

690 and below

25

25

1500

8500

A

NS/NSX -100H

70

70

NS/NSX -100L

150

150

NS/NSX -160N

36

36

1000

7000

NS/NSX -160H

70

70

NS/NSX -160L

150

150

NS/NSX -250N

36

36

1000

7000

NS/NSX -250H

70

70

NS/NSX -250L

150

150

NS/NSX -400N

45

45

1000

4000

NS/NSX -400H

70

70

NS/NSX -400L

150

150

NS/NSX -630N

45

45

1000

4000

NS/NSX -630H

70

70

NS/NSX -630L

150

150

NS/NSX -1250N

3 pole

50

37.5

1000

4000

NS/NSX -1600N

50

37.5


Note:

1. The N-pole breaker has no protection which closing and opening with the other three poles.

2. The type of thermal magnetic for NS-400/630 has no four poles.

1). Overload protection with adjustable threshold, as defined by IEC60947-4 (2) tripping class 10A,10 and 20;

2). Short-circuit protection with adjustable threshold (6...13 xIr);

3). Phase failure protection (built-in electronic release: operates unbalanced single-phase currentat 40% and more than) (tripping time delay 4s±10%), as defined by IEC60947-4.1;

4). Load indication : Flashing more than Ir setting threshold;

5). Fault indication.

LEDs indicates the type of fault that caused tripping;

Overload (LT protection) or abnormal component temperature (>Ir);

Short-circuit (ST or instantaneous protection) (>Im);

Phase failure (right LED);

Microprocessor malfunction ( (>Ir) (>Im) and phase failure LEDs all go on)

Battery powered. Spare battery are supplied in an adapter box. When a fault occurs, the LEDindicating the type of fault, lights for about 10 minute. The information is however stored inmemory. The LED can be illuminated by pressing the test pushbutton. The LED automaticallygoes off and the memory is cleared when the circuit breaker is reset.


TM thermal release (from 16 to 250A)



STR22SE electronic release (from 40 to 250A)



STR223E electronic release (from 250 to 630A)


4. Accessories:

Accessories

Rated operating voltage

Consumption

For type

Pick-up

Seal-in

Shunt release (MX)

24V

100V

220/230V

380/400V

<10VA

<5VA

NS-100~630

Under-voltagerelease (UN)

220/230V

380/400V

<10VA

<5VA


Accessories

Rated operating voltage

Consumption

For type

AC12

AC15

Auxiliary contact (OF)

380/400V

6

3

NS-100~630


5. Installation:

Circuit breaker may be mounted vertically, horizontally or flat on their back without any derating of characteristics.


6. Fix:

Mounting on backplate, mounting on rails


7. Connection:

Front panel connection, black panel connection, plug-in connection


http://www.cnzq-electric.com/

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