Function and Application
The NB7LE series residual current circuit breakers are suitable for AC 50Hz, rated voltage single-pole two-wire, two-pole 230V, three-pole, three-pole four-wire, four-pole 400V, with rated current up to 63A. When a person gets electrocuted or the leakage current of the power grid exceeds the specified value, the residual current circuit breaker can quickly cut off the faulty power supply within an extremely short time to protect personal safety and electrical equipment. It can also be used as overload and short-circuit protection for circuits, and in normal conditions, it is not frequently used to switch electrical devices and lighting circuits. It is especially suitable for lighting distribution systems in industrial and commercial applications. Standards: GB/T 16917.1, IEC61009-1, certified with CCC etc.
Detailed Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| System Parameters | Rated Voltage Level | AC 230V (1P+N, 2P), AC 400V (3P, 3P+IN, 4P) |
| Rated Current (In) | Basic current 32A: 6A, 10A, 16A, 20A, 25A, 32A; Rated current 63A: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A |
| Rated short-time withstand current (Icw) | 50kA |
| Rated limiting short-circuit current (Icu) | 6kA |
| Rated non-tripping residual current (I△n) | 0.03A, 0.1A, 0.3A |
| Number of poles | 1P+N, 2P, 3P, 3P+N, 4P |
| Rated ultimate breaking capacity | 6500A (C40/C40S), 4500A (C50), C63, D63 |
| Rated residual making and breaking capacity (IΔm) | 2000A |
| Terminal cover | See Figure 2, Figure 2 |
| Mechanical life | ≥10000 times |
| Electrical life | ≥4000 times |
| Dimensions and installation dimensions | See Figure 3, Figure 4, Table 6 |
| Pollution degree | Level 2 |
| Installation category | Class II |
| Operating environmental temperature | -10℃～+40℃ |
| Performance Indexes | Residual current trip time | Table 2 |
| Overcurrent protection characteristics (reference temperature 30℃) | Table 3 |
| Tripping characteristic curve | Figure E1 (Type C), Figure E2 (Type D) |
| Communication | Communication interface | RS485 |
| Protection Functions | Residual current protection | I△n=0.03A, 0.1A, 0.3A |
| Overload protection | I>1.13In |
| Short-circuit protection | I≥5In |
| Installation | Installation method | Rail mounting |
| Installation environment | Temperature -10℃～+40℃, relative humidity ≤95% RH, no condensation |
| Final Electrical Equipment | Electrical life | Table 4 |
| Others | Environmental temperature | -5℃～+40℃, average within 2 hours does not exceed +25℃ |
| Altitude | ≤2000m |
| Installation Conditions | The external surface of the installation location should not exceed five times the earth's magnetic field in any direction; the residual current protective device should be installed vertically, with the handle upwards as the power-on position; the installation location should have no significant impact or vibration. |
| Wiring Method | Cable tightening screw wiring, wiring method using screw tightening, bend is (1.5～2.0)m |
| Conductor cross-sectional area | Table 5 |
| Dimensions and installation dimensions | Table 6 |
