Applicable scope
- NYKM2L series moulded case circuit breaker with residual current protection (hereafter referred to as circuit breakers), mainly applies to AC 50Hz, its rated insulating voltage is 800V, rated working voltage is 400V, the circuit from rated working current to 630A is used as infrequent transferring and infrequent motor start. Circuit breaker has overload, short circuit and under-voltage protection functions.
- Circuit breaker has isolating function.
Main Characteristics
- Residual current three-phase protection: NYKM2L circuit breaker realizes earth fault protection, current-leakage protection module’s working power source sampling of regular circuit breakers with residual current protection is 2-phase.
- Adjustable at site: according to actual situations, rated residual action current I△n and residual current (non-delay and delay) can be adjustable at site;
- Low-voltage protection: when phase voltage lowers to 50V, leakage protection module still can work normally;
- With leakage alarm output function: when residual current of equipment or lines reach or exceed setting value, circuit breaker with leakage alarm unit module outputs one passive contact signal, and drives corresponding alarm device;
- This circuit breaker has such characteristics as small volume, high breaking, short flashover and vibration resistance;
- Circuit breakers can be installed vertically and horizontally;
Main Specifications and Technical Parameters
Main performance indicators of circuit breaker
| Type | NYKM2L-100 | NYKM2L-225 | NYKM2L-400 | NYKM2L-630 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Frame current Inm (A) | 100 | 225 | 400 | 630 | |||||
| Rated current In(A) | 16、20、25 、32、40 、50、63、80、100 | 100 、125、140 、160、180、200、225 | 225 、250 、315、350、400 | 400 、500、630 | |||||
| Number of poles | 3 | 4 | 3 | 4 | 3 | 4 | 3 | 4 | |
| Rated insulation voltage Ui(V) | AC800V | ||||||||
| Rated working voltage Ue(V) | AC400V | ||||||||
| Rated impulse withstand voltage Uimp（V） | AC8000V | ||||||||
| Arcing distance (mm) | 50 | 100 | |||||||
| Breaking capacity level | M | H | M | H | M | H | |||
| Limit short-circuit breaking capacity Icu(kA) | AC400V | 35 | 85 | 35 | 85 | 65 | 65 | ||
| Operation short-circuit breaking capacity Ics(kA) | AC400V | 22 | 50 | 22 | 50 | 42 | 42 | ||
| Rated residual short-circuit making (breaking) capacity I△m (kA) | 1/4Icu | ||||||||
| Rated residual action current I△n(mA) | Non-delay type | 30/100/500、100/300/500 | 30/100/500、100/300/500 | 100/300/500 | 300/500/1000 | ||||
| Delay type | 100/300/500 | 100/300/500 | 100/300/500 | 300/500/1000 | |||||
| Rated residual no action current I△no(mA) | 1/2 I△n | ||||||||
| Operational performance (times) | Power on | 1500 | 1000 | 1000 | 1000 | ||||
| Power off | 8500 | 7000 | 4000 | 4000 | |||||
| Total times | 10000 | 8000 | 5000 | 5000 | |||||