1. Applicable Scope and Purpose of Circuit Breaker
The NDM2L-125 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 125A. 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 | 125 |
| 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 | ||
3. Main Technical Parameters of Circuit Breaker
| Model | NDM2L-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 | |||||
| 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-time 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 action time | 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, 1.15 2.15 | 0.35, 1 2 | 0.25, 0.9 1.9 | 0.25, 0.9 1.9 | |
| Limit non-driving time (s) | / | 0.1, 0.5 1 | / | |||
| Operating performance (times) | Electrical life | 8000 | ||||
| Mechanical life | Maintainable free life | 20000 | ||||
| Maintainable life | 40000 | |||||
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