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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รายละเอียดสินค้า / Description ราคา / Price Number of Poles Current Rating Model Number Range Series Rated AC Voltage Tripping Characteristics Breaking Capacity Mounting Style Rated DC Voltage Length Width Depth Application
RS Stock No. 791-3142
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F53101
THB1,112.45
Each
Units
1 1 A - Acti 9 iC60H 12 → 60 V, 100 → 133 V, 220 → 240 V Type B 10 kA DIN Rail 12 → 48 V, 72 V 85mm 18mm 78.5mm -
RS Stock No. 734-9400
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F94210
THB4,319.78
Each
Units
2 10 A - Acti 9 iC60L 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V Type C 10 kA - 12 → 144V - 36mm - -
RS Stock No. 772-1527
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9N61523
THB4,881.11
Each
Units
2 3 A - Acti 9 C60H-DC - Type C - - 500V - - 73mm -
RS Stock No. 776-8841
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F84363
THB2,912.00
Each
Units
3 63 A - Acti 9 iC60H 440 V Type C 10 kA - 144V - 54mm - -
RS Stock No. 791-3326
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F54202
THB2,897.07
Each
Units
2 2 A - Acti 9 iC60H 12 → 133 V, 220 → 240 V, 380 → 415 V, 440 V Type C 10 kA DIN Rail 100 → 133V 85mm 36mm 78.5mm -
RS Stock No. 746-7719
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.S202-C10
Brand :ABB
THB1,522.68
Each
Units
2 10 A - System M Pro S200 400 V Type C 6 kA - - 88mm 35mm 69mm -
RS Stock No. 488-6836
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CDS251001R0104 - S201C10
Brand :ABB
THB587.20
Each
Units
1 10 A - System M Pro S200 253 V Type C 6 kA - 72V 88mm 17.5mm 75.8mm -
RS Stock No. 776-3464
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F77140
THB1,860.49
Each
Units
1 40 A - Acti 9 iC60N 240 V Type C 10 kA - 72V 18mm - 85mm -
RS Stock No. 178-336
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.S403M-C63
Brand :ABB
THB11,393.68
Each
Units
3 63 A - Smissline S400 230 V, 400 V Type C 10 kA - - 91mm 54mm 97mm -
RS Stock No. 734-9318
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F94220
THB4,338.55
Each
Units
2 20 A - Acti 9 iC60L 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V Type C 10 kA - 12 → 144V - - - -
RS Stock No. 539-8374
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CDS213001R0324
Brand :ABB
THB1,749.51
Each
Units
3 32 A - System M Pro S200 440 V Type C 6 kA - - 85mm 52.5mm 69mm -
RS Stock No. 791-3293
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F54110
THB687.18
Each
Units
1 10 A - Acti 9 iC60H 12 → 60 V, 100 → 133 V, 220 → 240 V Type C 10 kA DIN Rail 12 → 48 V, 72 V 85mm 18mm 78.5mm -
RS Stock No. 776-8781
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F84110
THB283.25
Each
Units
1 10 A - Acti 9 iC60H 230 V, 400 V Type C 10 kA - 72V - 18mm - -
RS Stock No. 177-939
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.S403M-C13
Brand :ABB
THB5,441.39
Each
Units
3 13 A - Smissline S400 230 V, 400 V Type C 10 kA - - 91mm 54mm 97mm -
RS Stock No. 769-4602
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.FAZ6-C20/2
Brand :Eaton
THB1,449.39
Each
Units
2 20 A - XEffect FAZ6 230 → 400 V Type C 6 kA - - 80mm 17.5mm 61.5mm -
RS Stock No. 776-3455
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F77116
THB1,227.36
Each
Units
1 16 A - Acti 9 iC60N 240 V Type C 10 kA - 72V - - 85mm -
RS Stock No. 746-7699
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.S202-C2
Brand :ABB
THB1,660.33
Each
Units
2 2 A - System M Pro S200 400 V Type C 6 kA - - - 35mm 69mm -
RS Stock No. 814-7633
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MG24430
THB3,156.52
Each
Units
1 6 A - - C60 277 V, 480 V Type C 10 kA - 60V - - - -
RS Stock No. 772-1521
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9N61528
THB4,364.19
Each
Units
2 10 A - Acti 9 C60H-DC - Type C - - 500V - 36mm 73mm -
RS Stock No. 825-5706
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.P1MB2PC01
Brand :Lovato
THB1,361.03
Each
Units
2 1 A - ModuLo P1MB 230 V, 400 V Type C 10 kA - 80V 86.5mm 36mm 79.52mm -
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