DC miniature circuit breakers (MCBs) are electrical devices designed to protect an electrical circuit from overcurrent and short circuit faults. They work by interrupting the flow of electric current when a fault is detected, thereby preventing damage to the circuit and the connected devices.

DC MCBs are typically made up of three main components: the contact system, the tripping system, and the operating mechanism.

DC Miniature Circuit Breakers internal structure

The contact system includes the fixed and moving contacts that carry the current through the breaker. When the current exceeds the rated value, the bimetallic strip in the tripping system heats up and bends, causing the operating mechanism to open the contacts and interrupt the current.

The tripping system consists of the bimetallic strip and a magnetic coil. The bimetallic strip is made up of two different metals with different coefficients of thermal expansion. When the current exceeds the rated value, the bimetallic strip heats up and bends, causing the operating mechanism to open the contacts and interrupt the current. In addition, the magnetic coil creates a magnetic field that can trip the breaker if the current exceeds a certain level.

DC MCB

The operating mechanism is responsible for opening and closing the contacts in response to changes in the current flow. It includes a spring-loaded mechanism that holds the contacts closed under normal conditions, but releases them when a fault occurs.

Overall, DC miniature circuit breakers are essential components of electrical systems that provide protection against overcurrent and short circuit faults. They work by interrupting the flow of electric current when a fault is detected, thereby preventing damage to the circuit and the connected devices.

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