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Question
What is ics,icu,icw of load breaker
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Circuit breakers are designed with withstand short circuit
currents for a short period of time, defined as Icw for a
period of 1 second. This is designed to guarantee
selectivity of breakers and other devices providing short
circuit current protection. The ultimate breaking capacity
of the breaker is the highest symmetrical short circuit
fault current that the breaker is designed to break, and the
breaker manufacture is required to guarantee this level of
performance for one time only. Ics or service breaking
capacity must be guaranteed at least 3 times.
Realistically, the value of Icu is not practical when
considering fault calculations in a distribution system, and
often manufacturers aim for achieving Ics=Icu.
 
Is This Answer Correct ?    101 Yes 18 No
Mike Evans
 
Answer
# 2
To my understanding Icm stands for Short Circuit Making
Capacity.
According to standard IEC 947-2 or BS EN60947, etc.
It is equal to 2.2 x Icu, where Icu means Ultimate breaking
capacity.
 
Is This Answer Correct ?    44 Yes 24 No
Tad Rybak
 
 
 
Answer
# 3
Icu - ultimate short-circuit breaking capacity
a breaking capacity for which the prescribed conditions according to a specified test sequence do not include the capability of the circuit-breaker to carry its rated current continuously
Ics - service short-circuit breaking capacity
a breaking capacity for which the prescribed conditions according to a specified test sequence include the capability of the circuit-breaker to carry its rated current continuously
Icw - rated short-time withstand current
The rated short-time withstand current of a circuit-breaker is the value of short-time withstand
current assigned
Icm - short-circuit breaking (or making) capacity
a breaking (or making) capacity for which the prescribed conditions include a short circuit
 
Is This Answer Correct ?    11 Yes 1 No
Ravikumar Varatharaj
 
Answer
# 4
Ultimate or rated short-circuit breaking capacity
(Icn - EN 60898)
A breaking capacity for which the prescribed conditions,
according to a specified test sequence do
not include the capability of the MCB (Miniature Circuit
Breakers) to carry 0.96 times its rated current for the
conventional time.
Ultimate short-circuit breaking capacity
(Icu - EN 60947-2)
A breaking capacity for which the prescribed conditions,
according to a specified test sequence do
not include the capability of the MCB to carry its
rated current for the conventional time.
Service short-circuit breaking capacity
(Ics - EN 60898)
A breaking capacity for which the prescribed
conditions according to a specified test sequence
include the capability of the MCB to carry 0.96
times its rated current for the conventional time.
Service short-circuit breaking capacity
(Ics - EN 60947-2)
A breaking capacity for which the prescribed
conditions according to a specified test sequence
include the capability of the MCB to carry its rated
current for the conventional time.
 
Is This Answer Correct ?    15 Yes 14 No
Vyara
 

 
 
 
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