Function and use
NM10 series plastic case circuit breakers (hereinafter referred to as circuit breakers) are mainly suitable for distribution network circuits with AC 50Hz, rated operating voltage to 380V, and rated current to 600A with infrequent operation. They are used to distribute electric energy and protect lines and power equipment from damage by overload, short circuit, undervoltage and other faults. Circuit breakers of 250A and below can also be used as infrequent starting and overload, short circuit and under-voltage protection of motors.
Detailed parameters
< td>
| Parameter classification | Parameter item | Parameter value |
|---|
| Test current name | Initial state | Cold state |
| < /td> | | Hot |
| I/In | 1.05 |
| | 1.30 |
| Appointed time | Inm=100 (A) |
| | In ≤ 63 |
| | 63 |
| | 250 |
| < /td> | 600 |
| | 1h |
| | 2h |
| | 2h |
| 2h |
| Serial number | Test current name | Setting current (I/In) |
| 1 | Agreed non-tripping current | 1.0 |
| 2 | Agreed tripping current | 1.2 |
| 3 | Returnable Current | 7.2 |
| Appointed time | 2h |
| | 2h |
| | ≤ 10S |
| Initial state | Cold state |
| | Follow sequence 1 Start after test |
| | —— |
| Model number | Instantaneous operating current setting value I(A) and tolerance of distribution circuit breaker | Motor protection circuit breaker instantaneous operating current setting value I(A) And tolerance |
| NM10-100, NM10-100H | 10In,±20% | 12In,±20% |
| NM10-250 | 10In, ±20% | 12In,±20% |
| NM10-600 | 10In,±20% | - |
| Single-pole short-circuit protection current action setting value I(A) | 14In (for power distribution) 17In (for motor protection) |
| Tripping time (s) | <0.2 |
| Model | Frame grade rated current (Inm A) | Rated operating voltage (Ue V) Rated insulation voltage (Ui V) Rated frequency (Hz) Rated ultimate short-circuit breaking capacity Icu kA 380V Rated operating short-circuit breaking capacity Ics kA 380V Arcing distance mm Rated current (In A) |
| NM10-100 | 100 | 380 380 50 15 7.5 150 20, 30, 40, 50, 60, 80, 100 |
| NM10-100H | 100 | 380 380 50 15 10 150 20, 30, 40, 50, 60, 80, 100 |
| NM10-250 | 250 | 380 380 50 20 12.5 200 120, 150, 170, 200, 250 |
| NM10-600 | 600 | 380 380 50 30 15 200 300, 400, 500, 600 |
