The Miniature Circuit Breaker CNC NV821556 3-Pole 32A C-Curve 6kA is compared with similar protective devices from the same CNC series, including the CNC NV821563 (40A), CNC NV821532 (20A), CNC NV821457 (1-pole, 32A), CNC NV821525 (16A), and CNC NV821617 (4-pole, 25A). All these devices share a reliable design for protecting electrical installations against overloads and short circuits, feature the same 6kA breaking capacity, and use a C-curve tripping characteristic. The main differences lie in the rated current amperage, number of poles, and consequently the requirements for connected cable gauges and protected circuit power.
⚙️ The table below compares key characteristics such as the number of poles, rated current, tripping curve, and breaking capacity to help determine the application scope of each model.
| Characteristic | CNC NV821556 (32A, 3P) | CNC NV821563 (40A, 3P) | CNC NV821532 (20A, 3P) | CNC NV821457 (32A, 1P) | CNC NV821525 (16A, 3P) | CNC NV821617 (25A, 4P) | Practical significance |
|---|
| Poles | 3 | 3 | 3 | 1 | 3 | 4 | The number of poles determines whether the device supports single-phase or multi-phase networks. |
| Rated current | 32A | 40A | 20A | 32A | 16A | 25A | The rated current defines the maximum circuit load before protection is triggered. |
| Tripping curve | C-curve | C-curve | C-curve | C-curve | C-curve | C-curve | All models are equally effective at protecting standard loads with moderate inrush currents. |
| Breaking capacity | 6kA | 6kA | 6kA | 6kA | 6kA | 6kA | Unified safety level against short-circuit currents across all devices in the series. |
◎ The table below evaluates the suitability of each model for various usage scenarios and loads within residential, commercial, or industrial electrical systems.
| Use case | Recommended product | Why |
|---|
| Three-phase line with moderate load up to 32A | Miniature Circuit Breaker CNC NV821556 3-Pole 32A C-Curve 6kA | Ideally suited for distribution panels, protecting three-phase consumers rated up to 32 amperes. |
| Higher-load three-phase consumers (up to 40A) | CNC NV821563 Miniature Circuit Breaker 3-Pole 40A C-Curve 6kA | Provides higher current capacity for heavier equipment thanks to the 40A rating. |
| Three-phase lighting or outlet circuits (up to 20A) | Miniature Circuit Breaker CNC NV821532 3-Pole 20A C-Curve 6kA | Optimal for protecting circuits with lower allowable load limits. |
| Single-phase network with a 32A load | Miniature Circuit Breaker CNC NV821457 1-Pole 32A C-Curve 6kA | Suitable for safeguarding an individual 32-ampere single-phase line, whereas the main model handles three phases. |
| Lower-power three-phase lines (16A) | Miniature Circuit Breaker CNC NV821525 3-Pole 16 Amps C Curve 6kA Breaking Capacity | Best choice for standard socket groups restricted to 16 amperes. |
| Three-phase networks requiring neutral switching | CNC NV821617 Miniature Circuit Breaker 4P 25A Class C 6kA | Four-pole configuration allows complete disconnection of four-wire lines. |
The Miniature Circuit Breaker CNC NV821556 3-Pole 32A C-Curve 6kA is an optimal choice for protecting standard three-phase electrical circuits with loads up to 32A in residential and commercial distribution panels. Compared to alternatives with lower current ratings (16A or 20A) or fewer poles (1P), it delivers the required capacity for heavier equipment while maintaining the same reliable 6kA breaking capacity and C-curve protection. Choose this model if your three-phase circuit calculation calls specifically for 32 amperes.
