In this overview, CNC NV821921 is compared against similar residual current breakers with over-current protection from the same manufacturer: CNC NV821952, CNC NV821945, CNC NV821969, CNC NV821907, and CNC NV821891. All products belong to the same category and deliver reliable protection against overloads, short circuits, and earth leakage faults, sharing a 30mA residual current sensitivity, a 6kA breaking capacity, and a C tripping curve. The primary differences lie in the pole configuration (2-pole or 4-pole) and the rated current, which dictate their suitability for specific electrical circuit designs.
⚙️ A detailed comparison of core specifications and parameters, including pole configuration, rated current, tripping curve, residual current sensitivity, and breaking capacity, is provided in the table below.
| Comparison parameter | CNC NV821921 | CNC NV821952 | CNC NV821945 | CNC NV821969 | CNC NV821907 | CNC NV821891 | Practical conclusion |
|---|
| Pole configuration | 4-pole | 4-pole | 4-pole | 4-pole | 2-pole | 2-pole | 4-pole devices are designed for three-phase networks, whereas 2-pole models suit single-phase circuits. |
| Rated current | 16A | 32A | 25A | 63A | 32A | 25A | The current rating determines the maximum load allowed for the protected circuit lines. |
| Tripping curve | C-curve | C-curve | C-curve | C-curve | C-curve | C-curve | The standard C-curve is optimal for most residential and commercial electrical loads. |
| Residual current sensitivity | 30mA | 30mA | 30mA | 30mA | 30mA | 30mA | The 30mA threshold provides effective personal protection against electric shock. |
| Breaking capacity | 6kA | 6kA | 6kA | 6kA | 6kA | 6kA | A 6kA capacity ensures safe fault interruption in standard distribution boards. |
◎ A comparison of usage scenarios and buyer requirements that determine the most suitable residual current breaker model is presented in the table below.
| Use case | Recommended product | Why |
|---|
| Protection of standard three-phase lighting lines or moderate load outlets | CNC NV821921 | The 16A rating perfectly matches standard cabling and moderate power demands in three-phase networks. |
| Safeguarding high-power three-phase loads or main incoming lines in commercial setups | CNC NV821969 | The 63A rating handles heavy electrical loads safely within main distribution nodes. |
| Protecting heavy-duty single-phase residential socket groups | CNC NV821907 | The 2-pole setup with 32A is optimized for higher-load single-phase circuits. |
Your choice between CNC NV821921 and the alternative models depends on your electrical system configuration and the expected load. CNC NV821921 is best suited for three-phase installations requiring 16A protection, while other options cater to single-phase systems or higher current ratings.
