Breaker

1. Value Icu, Ics, Icw of the circuit breaker is?
Value Icu, Ics, Icw of the circuit breaker is?
Ic (Interrupting Capacity) rating to withstand a short circuit. Maximum safety brake packages. It's typically
configured to withstand the current game. As kA. Ic shows that the breakers. Using it is very safe nut. I
just select the charge current Ic must know the short circuit current. At that point first.
Rated to withstand high short circuit current. Picks Interrupting Capacity (Ic) according to the IEC60947-2
standard, can be divided into four categories during the year.
*** 1) Icu or Icn (Rated short-circuit breaking capacity).
Coordinates the flow resistance means that shortcut. Circuit highest safety brake. Parker is specified as
standard value. The rms of AC The components are considered transient DC (the DC. Transient) Zero
Current Rating in the Industry sector. Industrial value called Icu (Rated ultimate sc breaking capacity)
called the housing sector. The unit is usually Icn kA rms test the Icu or Icn according to IEC has three
characteristics.
1.1) Operating sequences (open-close /. open) is tested to withstand the current cutoff. The closed circuit
and open circuit. The Breakers now have the new shortcut. Cycle
1.2) Current and voltage phase displacement is tested to withstand the current cutoff. The power factor of
the circuit, which found that if the power factor = 1 to disconnect circuits easier, and if power factor is
lower how much Vojislav discharging cycle. The only difficult part This is consistent with the local. Most of
that power is. Cool lagging power factor and even a short circuit current high tech. These are (near the
generator or transformer size), the lower the power factor.
1.3) Dielectric withstand capability is a test of the insulation. Frame (case) of the circuit breaker after a
short-circuit. I still
*** 2) Icm (Rated making capacity).
Coordinates the flow resistance means that shortcut. The maximum peak current of the circuit breaker
and can withstand up to disconnect the circuit immediately. Any (instantaneous) force without delay.
Rated voltage (rated voltage) under certain conditions.

2. In alternating current peak is related to Icu value by a factor (k factor), which varies according to the
power factor of the short circuit.
- (Icu) to more than 6kA 10kA -> (power factor) = 0.5 -> (Icm) = 1.7 x Icu.
- (Icu) over 10kA to 20kA -> (power factor) = 0.3 -> (Icm) = 2 x Icu.
- (Icu) over 20kA to 50kA -> (power factor) = 0.25 -> (Icm) = 2.1 x Icu.
- (Icu) over 50kA -> (power factor) = 0.2 -> (Icm) = 2.2 x Icu.
*** 3) Icw (Rated short-time withstand current).
This value depends on its type. low voltage switchgear, which is divided into two groups.
3.1) A type switchgear system is no requirement to check. The delay in the operation of the device. Korn
magnetic trip (to cycle through unlocked stay. Possibly magnetic) and molded case circuit breaker, so
molded case CB. There is no value Icw.
3.2) Type B is a switchgear system can delay the release. The cycle has to be made. Discharging cycle is
sequenced (discrimination) in the breaker to close. Short circuit the band should release Therefore, the
circuit before the next (especially the main) which must withstand higher short circuit current. And that is
longer than the time. This by itself does not release cycle and. No damage, coordinates and short circuit
currents. The maximum tolerated breaker in. The case to delay this. Called short-time withstand current
rating (Icw) are identified by the Icw or t test with brakes. Correa, an electronic trip as Air circuit breaker or
molded case type, heavy duty.
In summary, the short circuit current Icw is most important. For breaker type B, which can withstand the
effects of Buganda. Temperature, stress and strain of the magnetic North. The place itself is not damaged
capacity. One time specified by the manufacturer.
*** 4) Ics (Rated service short short-circuit breaking capacity).
Let them know when that is. The disconnect circuit breaker after the game. Remove the short circuit first.
The breaker can then be tolerated. Short circuit on the same or next. Not relative to the value specified as
a percentage of Icu. Icu low as 25, 50, 75 and 100%.
Breaker identified as one of the Ics = 0.5 Icu means that when the circuit breaker. Reduce cycle after
cycle of the shortcut. The first The breaker can then be tolerated. Short circuit the next time it is equal to
50% of Icu.