1. Applicable Scope and Purpose of Circuit Breaker

The NDM2E-250 series of electronic molded case circuit breakers (hereinafter referred to as circuit breakers) apply to infrequent switching of circuits with the AC 50Hz, the working voltage of AC400V and working current of 250A as well as infrequent motor starting. With the overload, short circuit and undervoltage protection functions, the circuit breaker can protect lines and power equipment from damage. The NDM2E circuit breaker can provide modules with the communication function, which can make the original circuit breaker upgrade to the communication circuit breaker conveniently, thus realizing “Four remotes” functions, namely, remote control, remote adjustment, remote measuring and remote measurement.

2. Specification and Model Description of Circuit Breaker

ND M 2 E-250 □ □/ □/ □ □ □ □ □ □1  2 3 4  5  6  7   8   9  10 11 12 13 14
1Enterprise codeND: “Nader” low-voltage apparatus
2Product codeM: Molded case circuit breaker (MCCB)
3Design SN2
4Derived code of the seriesE: Electronic
5Shell frame level250
6Breaking capacity levelM: Relatively high breaking type
H: High breaking type
7Operation modeNo code: Direct handle-operated mode
P: Motor-operated
Z: Rotary operation
8Derived code of the functionNo code: Basic type intelligent release
G: Ground protection type intelligent release
T: Communication type intelligent release
GT: Ground protection communication type intelligent release
9Number of poles3
10Accessory codeSee Table 1
11Application codeNo code: Power distribution type
2: Motor protection type
12Setting currentSee Table 2
13Cabling typeNo code: Normal product
P: Connection busbar
Z1: Rear-plate connection
Z2H: Plug-in rear-plate connection
Z2Q: Plug-in front-plate connection
14Other codesDT: Dedicated for power grid
Codes of internal and external accessories: Such as manual operation: CS1-A, electric operation: DC1 220V, shunt: AC230V, undervoltage: DC220V

4. Main Technical Parameters of Circuit Breaker

Table 2 Main Technical Parameters of Circuit Breaker ModelNDM2E-250
Rated current of frame Inm (A)250
Setting current Ir(A)100, 125, 160, 180, 200, 225, 250
Rated insulation voltage Ui (AC V)800
Rated impulse withstand voltage Uimp (V)8000
Rated working voltage Ue (AC V)400
Power frequency withstand voltage U (1min) (V)3500
Utilization categoryA
Rated short-time withstand current Icw (kA/1s)2.5
Number of poles3
Breaking capacity levelMH
Rated limit short-circuit breaking capacity Icu (kA)AC400V5085
Rated operating short-circuit breaking capacity Ics (kA)AC400V5050
Operating performance (times)Electrical life8000
Mechanical lifeMaintainable free life20000
Maintainable life40000
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