The B,C,D trip curves have more to do with the instantaneous trip response. According to the attached trip curve image - a 4 X current fault on a B trip curve will trip the breaker at somewhere within 1/2 second. The same fault on a C trip curve breaker will take 10 seconds or more for the breaker to respond.. Type B and C circuit breakers can generally be selected to achieve tripping times that will protect the circuit conductors against normal surge currents in accordance with BS 7671. This is more difficult to achieve with Type D devices, which may require a lower earth loop impedance (Zs) to achieve tile operating times required by Regulation 413.
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Trip curve type: B, C, D, K, Z Amperage: Refer to code table MCB type Neutral pole:. miniature circuit breaker to be selected according to the application. When selecting a trip curve for the application, load type and inrush current are driving factors in the selection process. System pro M compact circuit breakers offer up to five trip curves. Most circuit breakers have two tripping technologies in them which makes the trip curve charts difficult to read. There is a magnetic trip curve for short c.
