The data written on the M.CB cutters
1- C60H
C60 : Product Model Number,
H : Type Breaking Capacity
It is the commercial and reference number of the breaker in the manufacturer’s catalogs, which shows the technical data of the breaker, where the manufacturer classifies the breakers into several categories according to the nominal current. For example, in Schneider circuit-breakers up to 63 A, they are within the category C60H circuit-breakers, and this category is current Minors have a high H of up to 10ka
2 -C Tripping Curve Type Curve Separation
It is the operating curve of the separation unit for the cutter. In this type, the cutter belongs to the characteristics of curve C, and the nominal current of the cutter is written directly next to it. In this cutter, its value is A 63. There are also other curves such as the characteristics of curve B and the properties of curve D, and each of them has different magnetic separation limits from the other, which is the thing Which makes one type suitable for a specific application over another type, as we mentioned, so it is considered the most important characteristic of the M..CB, so it is written on the data plate of the cutter
3 – 63: Max.Current Rating In the nominal current of the breaker
It is the maximum current that can pass through the C.B continuously without causing the circuit to break, and it is measured in amperes, and it has well-known standard values, which are (in amperes):
6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A
The Rated Current is calculated based on the load current, as shown in the explanation
In: Rated Current of C.B (AMP) depend On KVA Of load
As we can see on the data plate, the nominal current for this cutter is 63A = In
4 – 415 V ͠ : Rated operational Voltage (Ue).
It is the voltage designed for the switch to function properly under normal operating conditions and is measured in volts
The cutter can work on ͠240 / 415 / 440 V voltages, and the voltage values on which the cutter is designed to operate under normal operating conditions are written on the cutter’s data plate. There are also types that operate on continuous voltage.
Circuit Breakers info
1000 – 5
Breaking Capacity Icu OR Icn (KA)
It is the maximum value of the cutting capacity that the cutter can bear once and disconnects its current, but then the cutter must be tested
The most popular standard value for Short Circuit Capacity, SCC Max, measured in (KA), is: 50
100, 10,15,20,25,30,50 KA
A distinction must be made between Breaking Capacity Icu (KA) and Ics (KA) service short-circuit capacity
Ics : Service short-circuit capacity (KA)
It is the value of the short circuit current that the CB can withstand for a period of time that does not exceed three consecutive times, including a time of three minutes during the short circuit without burning, which is or a percentage of Icu
Ics=25,50,75,100% Icu
The Short Circuit Capacity is calculated from the short circuit calculations of the electrical system
NB:
The higher the Ics ratio of the Icu, the greater the cutter’s ability to withstand high-value short currents several times, which raises the safety rates of the facility and the life span of the cutter. Therefore, the cutter with a cutting capacity of Ics = 100% Icu provides the highest rates of safety and continuity of operation of the equipment.
The price of a CB depends mainly on the value of the maximum short-circuit capacity that the Icu can bear. The difference between a CB with a rated current of 10A and a CB with a short-circuit current of 63A, for example, may not be large and does not exceed tens of pounds. As for the difference in price between a CB with a current of 100A and a short-circuit capacity of 6KA, and the last with a current of 6KA The rating is 100A, but it has a short capacitance equal to 50KA, as it may reach thousands of pounds.
6-Circuit Breaker Part Number
A place designated for writing the numbering of the breaker in the power circuit that you designed for easy access to it during the maintenance process
7- Electrical Diagram – No. of Poles Electrical drawing of the cutter
The electrical symbol for the circuit breaker in the electrical power circuit
8- Classification
Cutter classification Here are three poles
Some definitions will be present on the body of the cutter side
Ui: Rated insulation voltage
It is the maximum voltage that the cutter can withstand for a certain period (1 – 3) seconds when the voltage is 1.5 times the rated voltage Ue
Uimp: Rated impulse-withstand voltage
It is the resistance of the device to high voltages, which usually come as a result of locking and opening, lightning strikes, or the occurrence of electrical shorts, and they are usually more than 15 times the rated voltage, and the duration is in milliseconds
Ir: Thermal cut-off current or conventional cut-off current:
It is the current that disconnects the circuit breaker in a time of less than one hour (1hr). This current cannot be calibrated in the miniature (small) circuit breakers (M.CB). Rather, we choose a nominal current circuit breaker that allows the electric load to operate in normal operating conditions and at the same time protect the electrical load from the resulting current due to Increasing the mechanical load (increasing the load on the motor). As for the inverted circuit breakers (M.CCB) and the pneumatic circuit breakers (A.CB), it is determined by a special indicator for this protection called the Ir indicator.
Im: magnetic separation current or instantaneous separation current
It is the lowest current that works to disconnect the cutter in a time ranging between 0.2: 5 sec) and the value of this current depends on the properties of the curve in the miniature (small) circuit breakers M.CB, while in the inverted circuit breakers M.CCB and the air circuit breakers A.CB it is determined by A special indicator for this protection is called the Im indicator
الــ(Category A ( Cat A
– They are circuit breakers that are installed near the final loads and are required to perform instantaneous disconnection, i.e. the time of disconnection of the circuit breaker cannot be calibrated..and they are not expected to achieve selectivity by time accumulation, such as miniature (small) circuit breakers (M.CB).
الــ(Category B ( Cat B
– They are circuit breakers that are installed in public panels and are required to perform the disconnection with a delay time, i.e. the circuit breaker time can be calibrated and are expected to achieve selectivity by time accumulation, such as the M.CCB and A.CB circuit breakers.
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