How to Read an MCB Nameplate?

How to Read an MCB Nameplate?

Understanding Miniature Circuit Breaker (MCB) nameplate data is crucial for selecting the right breaker and ensuring electrical safety. Here’s a breakdown of the key information printed on it:

✅ Model Number (e.g., C60N): Identifies the product series.

✅ Class & Current Rating (e.g., C20): ‘C’ represents the tripping curve, and ‘20’ indicates the rated current in amperes.

✅ Operating Voltage (e.g., 400V~): Maximum voltage the MCB can handle.

✅ Breaking Capacity (e.g., 6000): The maximum fault current the MCB can safely interrupt without damage.

✅ Energy Class (e.g., 3): Efficiency of arc extinguishing and energy limitation.

✅ Terminals & No. of Poles: Determines how many circuits the MCB can protect.

✅ MCB Operation Symbol: Indicates the tripping mechanism.

✅ Status Indicator (ON/OFF): Shows the current state of the breaker.

Why is this important?
Proper MCB selection prevents overloads, short circuits, and equipment damage. Understanding these markings ensures compliance with safety standards and optimal circuit protection.

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Source: LinkedIn

Credits: Mr. Sachin Akalanka