NDM2Z-630

未分类 120

1. Applicable Scope and Purpose of Circuit Breaker

The NDM2Z-630 DC molded case circuit breaker (hereinafter referred to as circuit breaker) applies to the DC system application environment and the electric circuit with the working voltage of DC250V and the working current of 630A. With the overload, short circuit and undervoltage protection functions, the circuit breaker can protect lines and power equipment from damage.

2. Specification and Model Description of CircuitBreaker

ND   M   2   Z – 630   □ / □   □   □   □  □    1    2   3   4    5    6    7    8    9    10   11   
SNSN nameNDM2Z
1Enterprise codeND: “Nader” low-voltage apparatus
2Product codeM: Molded case circuit breaker (MCCB)
3Design SN2
4Derived code of the seriesZ: DC
5Shell frame level630
 6 Operation modeNo code: Direct handle-operated mode
  P: Motor-operated
  Z: Rotation handle
7Number of poles2, 3
 8 Release code0: Release (none)
  2: Instantaneous tripper only
  3: Complex tripper
9Accessory codeSee Table 1
10Rated currentSee Table 2
   11   Cabling typeNo code: Normal product
  P: Connection busbar
  Z1: Rear-plate connection
  Z2Q: Plug-in front-plate connection
  Z2H: Plug-in rear-plate connection
  Z3Q: Integrated plug-in front-plate connection
  Z3H: Integrated plug-in rear-plate connection

3.Main Technical Parameters of Circuit Breaker
Table 2 Main Technical Parameters of Circuit Breaker

ModelNDM2Z-630
Rated current of frame Inm (A)630
Rated current In (A)400, 500, 630
Rated insulation voltage Ui (AC V)1000
Rated impulse withstand voltage Uimp (V)8000
Power frequency withstand voltage U (1min) (V)3500
Utilization categoryA
Rated working voltage Ue (DC V)250
Number of poles23
Rated limit short-circuit breaking capacity Icu (kA)5050
Rated operating short-circuit breaking capacity Ics (kA)5050
  Operating performance (times)Electrical life1000
  Mechanical life Maintainable free life4000
   Maintainable life8000
3.1Selection of the circuit breaker connecting bus or cable cross-section area:
Table 3 Selection of the NDM2Z-630 Connecting Bus or Cable Cross-section Area
Rated current (A)Cable sectionCopper bar size
 QuantityCross-section area (mm2)QuantityCross-section area (mm2)
4001240//
5002150230×5
6302185240×5

3.2Tightening 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)
 NDM2Z-630M1228
 M66

3.3Derating 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
  NDM2Z-630Temperature (℃)40455055606570
 Derating factor10.9790.9580.9370.9150.8930.871
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.

3.4High-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 coefficientIsolation voltage correction coefficient
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, Mounting Hole Dimensions and Safety Distance of Circuit Breaker
5.1Outline and mounting hole dimensions of circuit breaker

Note: The limit deviation not indicated with the tolerance dimensions is as per GB/T 1804-c.
5.2Safe 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  
NDM2Z-630251203535

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

ModelWidth of circuit breakerI Center distance
 2 poles3 poles2 poles3 poles
NDM2Z-630182182222222
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 Center Distance between Stacked Circuit Breakers ( Unit: mm)

ModelH (distance of circuit breaker from bottom)
 With a terminal coverWithout a terminal cover
NDM2Z-630155155
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 oducts are energized.
 
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