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Why use a Isolator which needs to be operated manually while a MCB operates automatically?


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Isolator versus MCB

Note: International content

An MCB (Miniature Circuit Breaker) and an isolator are both electrical safety devices, but they serve different purposes:

  1. MCB (Miniature Circuit Breaker):

    • Function: It is designed to automatically disconnect the circuit in the event of an overcurrent (due to overload or short circuit).

    • Protection: It provides protection for the circuit and connected devices by preventing damage due to excessive current.

    • Operation: It trips automatically when the current exceeds the rated value for the specific time, restoring the circuit once the fault is cleared.

    • Usage: Primarily used for overload and short circuit protection in domestic, commercial, and industrial electrical systems.

  2. Isolator:

    • Function: An isolator is a manual switch used to disconnect a part of the electrical circuit or equipment from the power supply, ensuring it is completely isolated for maintenance or safety purposes.

    • Protection: It does not protect against over current; it only serves as a means to safely isolate parts of a circuit or system.

    • Operation: The isolator is operated manually and ensures that no current is flowing through the circuit before performing maintenance or repair work.

    • Usage: Typically used in industrial systems or high-voltage equipment for safe isolation during maintenance, repair, or shutdown.

In summary, the MCB is a protective device that responds automatically to over current conditions, while the isolator is a manual disconnecting switch that isolates the circuit for safety, often during maintenance. And as always, have a nice Solar Day



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