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It is the highest fault current that the MCCB can trip without being damaged permanently. Breaking Capacity of MCCB is pre-calculated permissible amount of fault current (value of current can flow from contacts before opening/tripping the MCCB without damaging) which may facilitate the safe operation of MCCB and distribution transformer both. The service short-circuit breaking capacity (I cs) is the breaking capacity according to a specified test sequence that does include the capability of the circuit breaker to carry 85 percent of its nontripping current for a specified time. Icu is nothing but unlimited break Capacity of the circuit breaker Which means the circuit breaker can break the maximum fault current without damage. Ics. (3) Ultimate short-circuit breaking capacity (Icu): Breaking capacity can be defined as the maximum level of fault current which can be safely cleared. IEC/EN 60898-1 defines fixed values of the ratio of I cs to I cn. The size and volume of ACB are larger, while that of MCCB is relatively small. Esteemed. Typically for MCB the maximum Icu will be 6KA to 10 KA for MCCB Icu may be 200kAmps. May 22, 2012 #5 or, with the older 3871 MCBs, it's denoted as M3,M6, etc., where the 3 or the 6 is the kA rating . Ultimate Breaking Capacity – This is the maximum value of fault current where MCCB can tolerate. 1. This is represented as Icu. Then, an additional security approach having maximum breaking capacity needs to function which means the functional reliability of MCCB. The MCCB provides protection against overload, short circuit faults and is also used for switching the circuits. Reactions: 1 person. Making and breaking capacity diffrent from each other. (3) Ultimate short-circuit breaking capacity (Icu): Breaking capacity can be defined as the maximum level of fault current which can be safely cleared. telectrix-Mentor. The wide current ratings and high breaking capacity in MCCB find their use in industrial applications. From the appearance, the size of moulded case circuit breaker is different from that of and air circuit breaker. It can be used for higher current rating and fault level even in domestic applications. The MCCB will be reusable after interrupting a fault, as long as it doesn’t exceed this value. Reply. As Tel has stated, the breaking capacity is always indicated on the MCB device either in a box using all figures ie, 3000A or as a term, ..ie, 3KA . Moreover, the current level and breaking capacity of air circuit breaker are greater than those of … The MCB, MCCB, & ACB are all Low Voltage Circuit Breakers, where SF6 is a Non-active gaze used in Medium Voltage Circuit Breakers. The MCCB will be reusable after interrupting a fault, as long as it doesn’t exceed this value. Arms. It is the highest fault current that the MCCB can trip without being damaged permanently. The higher this value, the device will not be able to trip. #9 "Re: Breaking Capacity OF MCCB" by nvmani on 09/30/2013 10:06 AM (score 3) #10 "Re: Breaking Capacity OF MCCB" by electricalexpert65 on 09/30/2013 10:54 AM (score 3) Comments rated to be "almost" Good Answers: Normally the value of Icu for Miniature Circuit Breaker (MCB) is between 6kA to 10kA and the Value of Moulded Case Circuit Breaker (MCCB) may be 200kA. Generally circuit breaker rating are defined in terms of breaking and making capacity. What is Ics: Ics means rated service breaking capacity or service short circuit breaking capacity. The rated breaking capacity (Icu) or (Icn) of a circuit breaker is the maximum fault current a circuit-breaker can successfully interrupt without being damaged.

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