Have you ever wondered what the difference is between the different MCB types and why you should select one over the other?
Well simply put, type B, C, and D devices are differentiated by their capability to handle surge currents without tripping. They specifically refer to inrush currents that come with reactive loads like lighting or loads with motors and battery charging equipment. The distinction is essential in determining which device is suitable for an application.
The image below shows the characteristics and the situatable application for each type of circuit breaker.
Type B devices are generally suitable for domestic applications. They may also be used in light commercial applications where switching surges are low or non-existent.
Type C devices are the normal choice for commercial and industrial applications where some degree of electrical inrush is expected.
Type D devices have more limited applications, normally in industrial use where high inrush currents may be expected. Examples include large battery charging systems, motors, transformers, X-ray machines and some types of lighting.
Types B, C, or D circuit breakers are classified based on the fault current rating at which they provide instantaneous protection against short-circuits. Instantaneous operation typically occurs in less than 100ms. It is crucial to ensure high inrush currents do not trip the circuit breaker unnecessarily. The proper classification of circuit breakers not only safeguards cable and equipment, but also ensures the safety of personnel.
If you have any questions on this or any related issues please feel free to get in contact.
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