Miniature circuit breaker symbol

The miniature circuit breaker (MCB) symbol is a standardized international symbol that represents a miniature circuit breaker. The symbol is a combination of a circle and a triangle, with the circle representing the breaker and the triangle representing the tripping mechanism.

The MCB symbol is used to indicate that a circuit breaker is designed to trip (or open) when the current flowing through it exceeds a certain threshold, typically due to an overload or short circuit. The symbol is often used in electrical diagrams, schematics, and documentation to identify MCBs and indicate their function.

Here is the standard MCB symbol:

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This symbol is widely recognized and used in many countries, including the United States, Europe, and Asia.