Frequently Asked Question
IC (kAIC) applies to protective interrupting devices such as circuit breakers and fuses. The unit of measure for AIC is Amps RMS Symmetrical. This figure, which is typically in range of 5000 to 200,000 amps, describes the maximum fault current that the protective device can clear safely, without welding closed or causing damage to equipment or personnel.
SCCR applies to complete pieces of equipment such as motor control enclosures containing breakers/fuses, contactors, or solid state devices used for motor control or components combined into a control scheme. The unit of measure is also Amps RMS Symmetrical, and describes the maximum fault current that the (combination) equipment can withstand safely—or the maximum available fault current of the feeder to which the equipment can be safely connected.