NSX (NSE, NS) series of plastic case circuit breakers is one of the new circuit breakers developed by the company using international advanced technology. Its rated insulation voltage is 950V, suitable for AC 50HZ or 60HZ, rated working voltage 690V and below. The rated operating current of 16A to 630A is used to distribute electrical energy, to perform infrequent closing and disconnection under normal conditions, and to protect the line and equipment from overload and undervoltage. Circuit breakers with rated frame currents of 400A and below can also be used for infrequent starting of squirrel-cage motors, disconnection during operation and motor overload, protection against short-circuit and under-voltage.
◆Installation method: vertical installation, horizontal installation;
◆ Circuit breaker use: distribution protection type, motor protection type;
◆ Wiring method: board front wiring, board rear wiring, plug-in wiring;
◆ Operation mode: direct operation of the handle, external operation of the handle, electric operation;
◆Retractor form: instantaneous action release (electromagnetic trip), thermal + electromagnetic release (multiple), electronic trip unit;
◆ pole number: two poles, three poles, four poles;
◆Working environment:
a. The altitude is 2000m or less;
b. The upper limit of ambient air temperature is +40 ° C, the lower limit is -5 ° C, and the average temperature within 24 h does not exceed +35 ° C;
c. The relative humidity of the atmosphere does not exceed 50% at ambient air temperature + 40 °C. It can have a higher relative humidity at a lower temperature, and the average maximum relative humidity of the wettest month is 90%;
d. Pollution level: level 3
[Protection characteristics]
◆Discharge characteristics for distribution protection
Rated current Thermal release type Instantaneous release setting current
1.05In (cold state) inactivity time 1.3In (hot state) operation time
10≤In≤63 1h 1h 10In±20%
63<In≤100 2h 2h 10In ±20%
100<In≤800 2h 2h 10In±20% or other multiples
◆Outlet characteristics for motor protection
Thermal release trip unit setting current
rated current 1.0In (cold state) 1.2In (hot state) 1.5In (hot state) 7.2In (hot state)
no action time Action time Action time Action time
In≤225 2h 2h ≤4min 4s≤TP≤10s 12In±20%
225<In≤630 2h 2h ≤8min 6s≤TP≤20s 12In±20%