MCBs

MCBs, or miniature circuit breakers, are a type of switch used to automatically turn off electrical circuits during abnormal conditions. MCBs often replace fuses in low voltage electrical circuits as they can be more reliable, much more sensitive and are resettable.


How an MCB Works


When continuous overcurrent flows through an MCB, a bimetallic strip is heated and causes it to bend. This bending of the bimetallic strip releases a mechanical latch opening the contacts and turning off the MCB, thereby stopping the current to flow in the circuit. To restart the flow of current the MCB must be manually turned on. This mechanism protects the MCB from faults arising due to overcurrent or overload and is intended to prevent the accidental overloading of the cable in a no-fault situation. The speed of the MCB tripping will vary with the degree of the overload. This is usually achieved by the use of a thermal device in the MCB. The second characteristic is the magnetic fault protection, which is intended to operate when the fault reaches a predetermined level and to trip the MCB within one-tenth of a second. The level of this magnetic trip gives the MCB its type characteristic.


MCBs are used to perform many functions such as local control switches, isolating switches against faults and overload protection devices for installation or specific equipment or appliances.


MCB Types


MCBs have three common types for circuit protection in residential, commercial and industrial applications. The use is classified by a type, which determines the tripping characteristics of the MCB:


Type B - trips between 3 and 5 times the load current


This type will trip instantly at a rate of three to five times its rated current. These are normally used for resistive or small inductive loads where switching surges are very small. Therefore, these are suitable for residential or light commercial installations.


Type C - trips between 5 and 10 times the full load current


This type will trip instantly at a rate of five to ten times its rated current. These are normally used for high inductive loads where switching surges are high such as small motors and fluorescent lighting. In such cases, type C MCBs are preferred to handle higher value of short circuit currents. Therefore, these are suitable for highly inductive commercial and industrial installations.


Type D - trips between 10 and 20 times the full load current


This type will trip instantly at a rate of ten to twenty-five times its rated current. These are normally used for very high inductive loads where high inrush current is very frequent. These are suitable for specific industrial and commercial applications. The common examples of such applications include x-ray machines, UPS systems, industrial welding equipment, large winding motors, etc.


How to select a suitable MCB for the application?


Focus on 3 main points to choose the right MCB for the electrical circuit


  1. Ampere rating

  2. Short circuit breaking capacity

  3. Application type

...
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제품설명 단가 Number of Poles Current Rating Model Number Range Series Rated AC Voltage Tripping Characteristics Mounting Style Rated DC Voltage Breaking Capacity at Maximum Voltage Rating Length Width Depth Break Time
RS 제품 번호 188-1753
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₩4,744.55
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1 10 A - - - 250V Type B - - 6 kA - - - -
RS 제품 번호 184-9027
제조사 부품 번호CPB1010B
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₩6,956.40
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1 10 A - - - 415V Type B DIN Rail - 10 kA - - - -
RS 제품 번호 184-9028
제조사 부품 번호CPB1010C
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1 10 A - - - 415V Type C DIN Rail - 10 kA - - - -
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제조사 부품 번호CPB1032C3
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₩20,915.70
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3 32 A - - - 415V Type C DIN Rail - 10 kA - - - -
RS 제품 번호 184-9030
제조사 부품 번호CPB1016B
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₩6,956.40
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1 16 A - - - 415V Type B DIN Rail - 10 kA - - - -
RS 제품 번호 184-9061
제조사 부품 번호CPB40
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₩4,744.55
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1 40 A - - - 250V Type B - - 6 kA - - - -
RS 제품 번호 184-9035
제조사 부품 번호CPB1020B3
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₩20,332.90
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3 20 A - - - 415V Type B DIN Rail - 10 kA - - - -
RS 제품 번호 184-9023
제조사 부품 번호CPB1006B
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₩6,956.40
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1 6 A - - - 415V Type B DIN Rail - 10 kA - - - -
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3 16 A - - - 415V Type D DIN Rail - 10 kA - - - -
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₩20,501.85
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3 6 A - - - 415V Type C DIN Rail - 10 kA - - - -
RS 제품 번호 184-9060
제조사 부품 번호CPB32
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₩4,744.55
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1 32 A - - - 250V Type B - - 6 kA - - - -
RS 제품 번호 184-9057
제조사 부품 번호CPB20
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₩4,744.55
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1 20 A - - - 250V Type B - - 6 kA - - - -
RS 제품 번호 184-9051
제조사 부품 번호CPB1050C3
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₩24,414.05
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3 50 A - - - 415V Type C DIN Rail - 10 kA - - - -
RS 제품 번호 184-9062
제조사 부품 번호CPB50
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₩4,744.55
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- 50 A - - - 250V Type B - - 4.5 kA - - - -
RS 제품 번호 184-9049
제조사 부품 번호CPB1050B
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₩7,793.40
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1 50 A - - - 415V Type B DIN Rail - 10 kA - - - -
RS 제품 번호 184-9037
제조사 부품 번호CPB1020C
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1 20 A - - - 415V Type C DIN Rail - 10 kA - - - -
RS 제품 번호 184-9046
제조사 부품 번호CPB1040B
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1 40 A - - - 415V Type B DIN Rail - 10 kA - - - -
RS 제품 번호 184-9094
제조사 부품 번호CPMCBBM2
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₩2,441.25
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- - - - - - - - - - - - - -
RS 제품 번호 184-9021
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₩3,357.30
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1 6 A - - - 250V Type B - - 6 kA - - - -