In low-voltage networks, there are three main types of CB:<br>MCCB (Model Case Circuit Breaker): This is a molded case CB, usually a three-phase CB. The structure includes: switch contacts, arc extinguishing chamber, thermal relay, magnetic relay, handle, switch, and other accessories. The rated current of this CB is 16A to 2500A or greater and can cut short circuit currents of 25KA to 100KA. This MCCB is usually installed on high-capacity lines, such as the entrance to the main cabinet and the entrance to the auxiliary cabinet.
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