NDM2Z-400
481. Applicable Scope and Purpose of Circuit Breaker The NDM2Z-400 DC molded case circuit breaker (hereinafter referred to as circuit breaker) applies to the DC system application e...
View details1. 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 | ||
SN | SN name | NDM2L |
1 | Enterprise code | ND: “Nader” low-voltage apparatus |
2 | Product code | M: Molded case circuit breaker (MCCB) |
3 | Design SN | 2 |
4 | Derived code of the series | L: Residual current protection |
5 | Shell frame level | 250 |
6 | Breaking capacity level | M: Relatively high breaking type |
H: High breaking type | ||
7 | Operation mode | No code: Direct handle-operated mode |
P: Motor-operated | ||
Z: Rotary operation | ||
8 | Derived code of the function | No code: Type AC current leakage protection type |
A: Type A current leakage protection type | ||
9 | Delay type | X: Non-time delay |
Y: Delay | ||
XI: Non-time delay + alarm non-tripping | ||
YI: Delay + alarm non-tripping | ||
10 | Residual current release type | V: Type V residual current release |
11 | Number of poles | 3, 4 |
12 | Release code | 3: Complex tripper |
13 | Accessory code | See Table 1 |
14 | Application code | No code: Power distribution type |
15 | N-pole (neutral pole) type of the 4P product | A: 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 | ||
16 | Rated current | See Table 2 |
17 | Cabling type | No 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
Model | NDM2L-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 category | A | ||||||||
Number of poles | 3 | 4 | |||||||
Breaking capacity level | M | H | / | ||||||
Rated limit short-circuit breaking capacity Icu (kA) | 52.5 | 85 | 52.5 | ||||||
Rated operating short-circuit breaking capacity Ics (kA) | 35 | 50 | 35 | ||||||
Rated residual short-circuit making and breaking capacity I△m(kA) | 0.25 Icu | ||||||||
Rated residual action current I△n(mA) | Non-ti me delay | Type AC | Type V 30/100/300/500 | ||||||
Type A | Type V 30/100/300/500 | ||||||||
delay | Type AC | Type V 100/300/500 | |||||||
Type A | Type V 100/300/500 | ||||||||
Rated residual non-action current I△no(mA) | 0.5I△n | ||||||||
Residual current actiontime | Residual current | I△n | 2I△n | 5I△n | 10I△n | ||||
Non-time delay | Maximum breaking time (s) | 0.2 | 0.1 | 0.04 | 0.04 | ||||
delay | Maximum breaking time (s) | 0.5, 1.152.15 | 0.35, 12 | 0.25, 0.91.9 | 0.25, 0.91.9 | ||||
Limit non-driving time (s) | / | 0.1, 0.51 | / | / | |||||
Operating performance (times) | Electrical life | 8000 | |||||||
Mechan ical life | Maintainable free life | 20000 | |||||||
Maintainable life | 40000 |
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) | 100 | 125, 140 | 160 | 180, 200, 225 | 250 |
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
Model | Thread diameter (mm) | Torque (N·m) |
NDM2L-250 | M8 | 12 |
M4 | 2.4 |
c)Derating factor of temperature change for the circuit breaker
Table 5 Derating Factor Table of Temperature Change for the Circuit Breaker
Model | Derating factor of product temperature change | |||||||
NDM2L-250 | Temperat ure (℃) | 40 | 45 | 50 | 55 | 60 | 65 | 70 |
Derating factor | 1 | 0.982 | 0.963 | 0.944 | 0.924 | 0.904 | 0.882 |
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 coefficient | Power frequency withstand voltage correction coefficient (V) | Isolation voltage correction coefficient (V) |
2000 | 1 | 3500 | 1000 |
2500 | 1 | 3500 | 1000 |
3000 | 0.98 | 3150 | 900 |
3500 | 0.97 | 3000 | 850 |
4000 | 0.95 | 2800 | 810 |
4500 | 0.94 | 2650 | 770 |
5000 | 0.93 | 2500 | 730 |
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 distance | A (inlet wire end to the cabinet face) | B (distance from side to the cabinet face) | C (outlet wire end to the cabinet face) | |
Model | With a terminal cover | Without a terminal cover | ||
NDM2L-250 | 25 | 65 | 30 | 30 |
Table 8 Minimum Center Distance between Rowed Circuit Breakers (Unit: mm)
Model | Width of circuit breaker | I Center distance | ||
3 poles | 4 poles | 3 poles | 4 poles | |
NDM2L-250 | 107 | 142 | 137 | 172 |
Table 9 Minimum Distance between Stacked Circuit Breakers (Unit: mm)
Model | H (distance of circuit breaker from bottom) | |
With a terminal cover | Without a terminal cover | |
NDM2L-250 | 90 | 93 |
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