Summary of Small Molded Case Circuit Breakers:

Small plastic case circuit breaker is used in AC 50HZ, rated current to 63A, single-phase 230V and three-phase 400V circuits. It is mainly used for overload and short-circuit protection of lighting lines, as well as in normal circumstances for the less frequent conversion of lines.

Use Conditions of Small Molded Case Circuit Breakers:

1. The upper limit of ambient air temperature does not exceed + 40 C, the lower limit does not exceed - 5 C, and the average temperature of 24 hours does not exceed + 35 C.

2. The altitude of the installation site shall not exceed 2000 m.

3. Atmospheric relative humidity should not exceed 50% when the ambient air temperature is + 40 C. Higher relative humidity can be allowed at lower temperatures.

4. Pollution grade: level 2;

5. The external magnetic field of the installation site should not exceed 5 times of the geomagnetic field in any direction.

6. Vertical installation with tolerance of 2 degrees in any direction.

7. Installation should be free from significant impact and vibration.

小型塑壳断路器

Structural characteristics of small plastic case circuit breaker:

1. It consists of a handle, an operating mechanism, a release device, an arc extinguishing device and a contact system. All parts are installed in the plastic shell to form an integral whole. The contact wear is less and the service life is longer because it can quickly split and close during operation.

2. There are interlocking tripping devices in bipolar and tripolar circuit breakers, which will not cause single-phase power failure.

Source of this article: reprinted in Baidu Encyclopedia by Hangkai Electric Appliance (Shanghai) Co., Ltd. (http://www.hangkaiele.com/)