1. Applicable Scope and Purpose of Circuit Breaker

The NDM2(X)-125 molded case circuit breaker (hereinafter referred to as circuit breaker) applies to infrequent switching of circuits with the AC 50/60Hz, the working voltage of AC690V and working current of 125A 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.

3. Specification and Model Description of Circuit Breaker ND M 2(X)-125□□/□□□□□□□1  2 3 4   567891011121314
1Enterprise codeND: “Nader” low-voltage apparatus
2Product codeM: Molded case circuit breaker (MCCB)
3Design SN2
4Series derived codeX: Small shell frame AC
5Shell frame level125
6Breaking capacity levelC: Basic type
L: Standard type
M: Relatively high breaking
H: High breaking type
7Operation modeNo code: Direct handle-operated mode
P: Motor-operated
Z: Rotation handle
8Number of poles2,3, 4
9Release code0: Release (none)
2: Instantaneous tripper only
3: Complex tripper
10Accessory codeSee Table 1
11Application codeNo code: Power distribution type
2: Protection motor type
12N-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
13Rated currentSee Table 2
14Cabling 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

4. Main Technical Parameters of Circuit Breaker

Table 2 Main Technical Parameters of Circuit Breaker ModelNDM2-125NDM2X-125
Rated current of frame Inm (A)125
Rated current In (A)16, 20, 25, 32, 40, 50, 63, 80, 100, 125
Rated insulation voltage Ui (AC V)1000
Rated impulse withstand voltage Uimp (V)8000
Rated working voltage Ue (AC V)380/400/415, 500, 550, 660/690380/400/415
Power frequency withstand voltage U (1min) (V)3500
Utilization categoryA
Number of poles42
Breaking capacity levelCLMH//
Rated limit short-circuit breaking capacity Icu (kA)AC380/400/415V253652.58552.535
Rated operating short-circuit breaking capacity Ics (kA)AC380/400/415V18.75273863.753826.25
 AC500V/25 ///
 AC660/690V  //15///
Operating performance (times)Electrical life8000
Mechanical lifeMaintainable free life20000
Maintainable life4000
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