1P D curve 6kA
MCBs D curve are recommended for protecting significantly inductive circuits (loads) and electric apparatus (motors) with very high starting currents
D-curve breakers are suitable for circuits with high inrush currents, such as motors. They handle 10–20 times the nominal current. D-curve breakers are more sensitive to tripping than B- and C-curve breakers, making them unsuitable for circuits with low inrush currents.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit. D-trip circuit breakers prevent nuisance tripping, so they are best for equipment that has a high spike in current at startup, such as transformers, power supplies, and heaters.
Also known as supplemental protectors, these circuit breakers mount directly to DIN rail downstream from a branch circuit breaker to protect a single piece of equipment. They are rated UL1077 for protection against overloads and short circuits. Because they are thermal- magnetic, these breakers trip two ways.
C-curve breakers are commonly used to protect circuits with devices that have a relatively low inrush current, such as lighting, outlets, household appliances, and small machinery. These breakers handle 5–10 times the nominal current and react slower to overloads and short circuits compared to B-curve breakers, as their tripping current is higher.
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