50/60Hz 125A 1600A Moulded Case Circuit Breaker MCCB Low Voltage Circuit Breaker
1. General
NM8N series moulded case circuit breaker is suitable for the circuit of AC50/60Hz, with rated voltage AC690V and below, DC system rated voltage DC1000V and below, and rated current of 16A and 1600A. It can protect circuits and electric equipment against overload, short circuit or undervoltage, and can also provide protection of overload, short circuit and under voltage for infrequent start of motor. Products have functions of power distribution protection, motor protection, residual current protection and isolation. The circuit breaker can be installed vertically, installed horizontally and can also enter the line from the bottom.
Standards compliant:
IEC 60947-1 general rules for low-voltage switchgear and control equipment;
IEC 60947-2 low-voltage switchgear and control equipment circuit breakers;
IEC 60947-3 low-voltage switchgear and control equipment switches, disconnectors and fuse combination appliances;
IEC 60947-4-1 Electromechanical contactors and motor starters (including motor protectors) for low voltage switchgear and control equipment.
2. Main Technical Data
| NM8N DC Moulded Case Circuit Breaker | 125 | 250 |
| Rated operating current In (A), 40 °C | 16-20-25-32-40-50-63-80-100-125 | | 125-160-180-200-225-250 | | |
| Electric characteristics | | | | | | | | | | | | |
| Rated insulation voltage Ui (V) | | 1000 | | | | | 1000 | | | | |
| Rated impulse withstand voltage Uimp (kV) | 8 | | | | | 8 | | | | |
| Rated operational voltageUe(V),DC | 250 , | 500 , 750 , | 1000 | | | 250 , | 500 , 750, | 1000 | | |
| Rated ultimate short-circuit | DC250V | IP | 25 | 36 | 50 | — | — | 25 | 36 | 50 | — | — |
| DC500V | 2P in series | 25 | 36 | 50 | 70 | 100 | 25 | 36 | 50 | 70 | 100 |
| breaking capacity Icu(kA) | DC750V | 3P in series | 25 | 36 | 50 | 70 | 100 | 25 | 36 | 50 | 70 | 100 |
| DC1000V 4P in series | 25 | 36 | 50 | 70 | 100 | 25 | 36 | 50 | 70 | 100 |
| | DC250V | IP | 25 | 36 | 50 | — | — | 25 | 36 | 50 | — | — |
| Rated service breaking capacity Ics(kA) | DC500V | 2P in series | 25 | 36 | 50 | 70 | 100 | 25 | 36 | 50 | 70 | 100 |
| DC750V | 3P in series | 25 | 36 | 50 | 70 | 100 | 25 | 36 | 50 | 70 | 100 |
| | DC1000V 4P in series | 25 | 36 | 50 | 70 | 100 | 25 | 36 | 50 | 70 | 100 |
3 .Operating conditions
3.1 Temperature:
Operating and storage temperature is -40° C~+70° C; the average value within 24 hours does not exceed +35° C; when the ambient temperature is -40° C~+70° C, users need to consider derating or temperature compensation whose details can be referred to in Page
3.2 Altitude: ≤ 2000m;
3.3 Pollution grade: Grade 3;
3.4 IP grade: IP40
3.5 Air conditions:
At mounting site, relative humidity not exceed 50% at the max temperature of +40 ℃ , higher relative humidity is allowable under lower temperature. For example, RH could be 90% at +20 ℃ , special measures should be taken to occurrence of dews.
Baikong electric was born and developed wellSichuan Baikong Electrical Technology Co., Ltd is a complete set of high and low voltage power distribution equipment automation equipment, set production, research and development and sales Import and export services and other integrated enterprises, the company is headquartered in Pengzhou Industrial Park, Chengdu City.The company's main products are box-type substation Medium and high voltage power transmission and distribution equipment, low voltage power distribution equipment, fire electrical equipment, intelligent industrial electrical equipment, new energy and energy storage electrical equipment, metering and protection power distribution equipment, high and low voltage complete switchgear, high voltage ring network cabinet, cable branch box,SF6 inflatable cabinet, etc.
