NDM2L—250

未分类 430

1. Applicable Scope and Purpose of Circuit Breaker

The NDM2L-250 molded case circuit breaker with the residual current protection (hereinafter referred to as circuit breaker) applies to infrequent switching of circuits with the AC 50/60Hz, the working voltage of AC415V and the working current up to 250A. With the overload, short circuit and undervoltage protection functions, the circuit breaker can protect lines and power equipment from damage. Meanwhile, they can deal with the personal safety, fire hazards and other potential risks caused due to long-term ground faults that can’t be detected with the overcurrent protection function.

2. Specification and Model Description of Circuit Breaker

ND   M   2   L – □  □ □ / □ □   □ / □ □   □ □   □ □   □1    2   3   4   5    6    7    8    9    10   11   12   13   14   15   16   17   
SNSN nameNDM2L
1Enterprise codeND: “Nader” low-voltage apparatus
2Product codeM: Molded case circuit breaker (MCCB)
3Design SN2
4Derived code of the seriesL: Residual current protection
5Shell frame level250
6Breaking capacity levelM: Relatively high breaking type
H: High breaking type
 7 Operation modeNo code: Direct handle-operated mode
P: Motor-operated
Z: Rotary operation
8Derived code of the functionNo code: Type AC current leakage protection type
A: Type A current leakage protection type
 9 Delay typeX: Non-time delay
Y: Delay
XI: Non-time delay + alarm non-tripping
YI: Delay + alarm non-tripping
10Residual current release typeV: Type V residual current release
11Number of poles3, 4
12Release code3: Complex tripper
13Accessory codeSee Table 1
14Application codeNo code: Power distribution type
  15  N-pole (neutral pole) type of the 4P productA: The N-pole isn’t installed with an overcurrent release, but always connected
B: The N-pole isn’t installed with an overcurrent release, but on-off with the other three poles
C: The N-pole is installed with an overcurrent tripper, and on-off with the other three poles
16Rated currentSee Table 2
   17   Cabling typeNo code: Normal product
P: Connection busbar
Z1: Rear-plate connection
Z2H: Plug-in rear-plate connection
Z2Q: Plug-in front-plate connection
Z3H: Integrated plug-in rear-plate connection
Z3Q: Integrated plug-in front-plate connection
Note:1、 When the operation mode is electric operation or manual operation, the residual action current gear, residual current action time gear, and leakage indication button can’t be adjusted;2、 Lower inlet wire not allowed for the 4P Type A product.

3. Main Technical Parameters of Circuit Breaker

Table 2 Main Technical Parameters of Circuit Breaker

ModelNDM2L-250
Rated current of frame Inm (A)250
Rated current In (A)100, 125, 140, 160, 180, 200, 225, 250
Rated insulation voltage Ui (AC V)1000
Rated impulse withstand voltage Uimp (V)8000
Rated working voltage Ue (AC V)380/400/415
Utilization categoryA
Number of poles34
Breaking capacity levelMH/
Rated limit short-circuit breaking capacity Icu (kA)52.58552.5
Rated operating short-circuit breaking capacity Ics (kA)355035
Rated residual short-circuit making and breaking capacity I△m(kA)0.25 Icu
  Rated residual action current I△n(mA)Non-ti me delayType ACType V 30/100/300/500
Type AType V 30/100/300/500
 delayType ACType V 100/300/500
Type AType V 100/300/500
Rated residual non-action current I△no(mA)0.5I△n
  Residual current actiontimeResidual currentI△n2I△n5I△n10I△n
Non-time delayMaximum breaking time (s)0.20.10.040.04
  delayMaximum breaking time (s)0.5, 1.152.150.35, 120.25, 0.91.90.25, 0.91.9
Limit non-driving time (s)/0.1, 0.51//
  Operating performance (times)Electrical life8000
 Mechan ical lifeMaintainable free life20000
Maintainable life40000

a)Selection of the circuit breaker connecting bus or cable cross-section area:
Table 3 Selection of the NDM2L-250 Connecting Bus or Cable Cross-section Area

Rated current (A)100125, 140160180, 200, 225250
Wire cross-section area (mm2) 35 50 70 95 120

b)Tightening Torque of the Circuit Breaker Terminal and Mounting Screw
Table 4 Tightening Torque of the Circuit Breaker Terminal and Mounting Screw

ModelThread diameter (mm)Torque (N·m)
 NDM2L-250M812
 M42.4

c)Derating factor of temperature change for the circuit breaker
Table 5 Derating Factor Table of Temperature Change for the Circuit Breaker

ModelDerating factor of product temperature change
  NDM2L-250Temperat ure (℃)40455055606570
Derating factor10.9820.9630.9440.9240.9040.882

Note: 1) When the operating ambient temperature is below ﹢40℃, the product can be used normally without derating capacity.
2) The above derating factors are measured at the frame current.

d)High-altitude derating factor of the circuit breaker

Table 6 High-altitude Derating Factor Table of Circuit Breaker

Elevation (m)Working current correction coefficientPower frequency withstand voltage correction coefficient (V)Isolation voltage correction coefficient (V)
2000135001000
2500135001000
30000.983150900
35000.973000850
40000.952800810
45000.942650770
50000.932500730

4.Normal Working Environment of Circuit Breaker
1)The altitude of the installation site doesn’t exceed 2,500m. See the “High-altitude Derating Factor Table of Circuit Breaker” for the derating factor at the altitude;
2)The ambient temperature is -35℃ ~ + 70℃; the average within 24 h shall not be more
than +35℃. If the ambient temperature is higher than +40℃, the user needs to reduce the capacity. See the “Derating Factor Table of Temperature Change for the Circuit Breaker” for the derating factor;
3)Its relative humidity at an ambient temperature of +40℃ should not exceed 50%. A higher
relative humidity is allowed at a lower temperature. For example, the relative humidity at 20℃ can reach 90%; for frost due to temperature change, the corresponding measures should be taken;
4)The product can withstand the effects of wet air, salt mist, oil mist and mould;
5)The installation category of the circuit breaker connected to the main loop is: Category Ⅲ (power distribution and control level), The installation category of the circuit breaker not connected to the main loop is: Category Ⅱ (load level);
6)The pollution level is Level 3;
7)The product should be installed in places that are free from explosive media, media corrosive to metal, insulation damaging gas, and conductive dust, which should be also avoided from snow and rain;
8)In case of stricter user conditions than the above description, negotiate with the manufacturer.

5.Outline and Mounting Hole Dimensions of Circuit Breaker
a)Outline and mounting hole dimensions of circuit breaker

Note: The limit deviation not indicated with the tolerance dimensions is as per GB/T 1804-c.
b)Safe mounting distance of circuit breaker
Table 7 Insulation Distance Mounted in the Metal Cabinet (Unit: mm)

Mounting distanceA (inlet wire end to the cabinet face)  B (distance from side to the cabinet face)  C (outlet wire end to the cabinet face)
 ModelWith a terminal cover Without a terminal cover
NDM2L-25025653030

Table 8 Minimum Center Distance between Rowed Circuit Breakers (Unit: mm)

ModelWidth of circuit breakerI Center distance
3 poles4 poles3 poles4 poles
NDM2L-250107142137172
Note: Check the connected busbar or cable during rowing or stacking of the circuit breaker to ensure that the air insulation distance won’t be reduced.

Table 9 Minimum Distance between Stacked Circuit Breakers (Unit: mm)

ModelH (distance of circuit breaker from bottom)
 With a terminal coverWithout a terminal cover
NDM2L-2509093
Note: 1) Bare cable connection
2)Cable insulating connection
3)Connection without insulation
Requirements: Check whether the terminal cover or phase partition is assembled properly before products are energized.
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