1. Applicable Scope and Purpose of Circuit Breaker

The NDM2-630 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 630A 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.

2. Specification and Model Description of Circuit Breaker

ND M 2-630 □ □/ □ □ □ □ □ □ □1  2 3  4  5  6   7   8  9 10 11 12 13   
1Enterprise codeND: “Nader” low-voltage apparatus
2Product codeM: Molded case circuit breaker (MCCB)
3Design SN2
4Shell frame level630
5Breaking capacity levelC: Basic type
L: St andard type
M: Relatively high breaking type 
H: High breaking type
6Operation modeNo code: Direct handle-operated mode
P: Motor-operated
Z: Rotary operation
7Number of poles3, 4
8Release code0: Release (none)
2: Instantaneous tripper only
3: Complex tripper
9Accessory codeSee Table 1
10Application codeNo code: Power distribution type
2: Motor protection type
11N-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
12Rated 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
Z3H: Integrated plug-in rear-plate connection
Z3Q: Integrated plug-in front-plate connection

3. Main Technical Parameters of Circuit Breaker

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
Rated working voltage Ue (AC V)400/415, 500, 690
Power frequency withstand voltage U (1min) (V)3500
Utilization categoryA
Number of poles34
Breaking capacity level  CLMH /
Rated limit short-circuit breaking capacity Icu (kA)  AC400/415V5035506510065
Rated operating short-circuit breaking capacity Ics (kA)AC400/415V26.2537.548.757548.75
Operating performance (times)Electrical life7500
Mechanical lifeMaintainable free life10000
Maintainable life20000
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