Skip to content CB7-125N miniature circuit breakers (MCB) are designed for AC 50/60Hz circuits with a rated voltage up to 400V and current range from 10A to 125A. They provide reliable protection against overload and short circuit conditions. Suitable for use in residential, commercial, industrial, and high-rise building applications.
Standards: IEC 60947-2, IEC 60898-1
1. Ambient air temperature -5°C ~+40°C (with daily average≤35°C)
2. Altitude:≤2000m.
3. Air conditions: At mounting site, relative humidity not exceed 50% at the maximum temperature of +40°C.
For the wettest month, the maximum relative humidity averaged shall be 90% while the lowest temperature averaged in that month is +20°C , special measures should be taken to occurrence of condensation.
4. The installation category is Ⅲ .
5. The circuit breaker shall be installed on DIN rail EN 60715(35mm), which shall meet theA1.1 TH 35-7.5 steel
mounting rail requirements.
6. Pollution grade: 3
7. Mounting conditions: inclination between mounting plane and vertical plane not exceed±5°.
8. The product should locate in the places where there are no obvious impact and shake.
| CB7 | – | 125 | N | 1P | C | 125 |
| Model | Shell grade current | Breaking capacity | Number of poles | Tripping. characteristics | Rated current | |
| Miniature circuit breaker | 125 | 6kA | 1P 2P 3P 4P | C D | 63, 80, 100, 125 |
| Type | Standard | IEC/EN 60947-2 | |
| Electrical features | Rated current In | A | 63, 80, 100, 125 |
| Poles | P | 1, 2, 3, 4 | |
| Rated voltage Ue | V | 230/400 | |
| Insulation voltage Ui | V | 500 | |
| Rated frequency | Hz | 50/60 | |
| Rated breaking capacity | A | 6000 | |
| Rated impulse withstand voltage(1.2/50) Uimp | V | 6000 | |
| Dielectric test voltage at ind. Freq. for 1min | kV | 2.5 | |
| Pollution degree | 3 | ||
| Thermo-magnetic release characteristic | (C)Ii=8In, (D)Ii=12In | ||
| Mechanical features | Electrical life | t | 1500 |
| Mechanical life | t | 10000 | |
| Contact position indicator | Yes | ||
| Protection degree | IP20 | ||
| Reference temperature for setting of thermal element | 30 | ||
| Ambient temperature | ℃ | -5~+40(Special application please refer to temperature compensation correction) | |
| (with daily average ≤35℃) | |||
| Storage temperature | ℃ | -25~+70 |
| Type | Test current | Tripping time | Expected result |
| C,D | 1.05In | t≤1h(In≤63A),t≤2h(In>63A) | Not tripping |
| C,D | 1.3In | t≤1h(In≤63A),t≤2h(In>63A) | Tripping |
| C,D | 2.55In | 1s<t<120s | Tripping |
| C | 8ln×80% | t≤0.2s | Not tripping |
| D | 12In×80% | t≤0.2s | Not tripping |
| C | 8ln×120% | t<0.2s | Tripping |
| D | 12In×120% | t<0.2s | Tripping |
