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

...
อ่านเพิ่มเติม อ่านน้อยกว่า

คัดกรอง / Filters

กำลังดูสินค้า 21 - 40 รายการจาก 2244 รายการ / Viewing 21 - 40 of 2244 products
ผลการค้นหาต่อหน้า / Results Per Page
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. 864-4352
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PLSM-C16/2-MW
THB1,607.30
Each
Units
2 16 A - XPole PLSM 230 V ac Type C 10 kA - 48V 35mm 80mm 75mm -
RS Stock No. 776-8863
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9K24325
THB1,149.50
Each
Units
3 25 A - Acti 9 iK60N 400 V Type C 6000 A - - - 54mm - -
RS Stock No. 489-6625
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY6106-7
Brand :Siemens
THB770.85
Each
Units
1 6 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 772-1530
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9N61531
THB4,671.30
Each
Units
2 16 A - Acti 9 C60H-DC - Type C - - 500V - 36mm 73mm -
RS Stock No. 539-8201
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CDS211001R0064
Brand :ABB
THB485.58
Each
Units
1 6 A - System M Pro S200 440 V Type C 6 kA - 60V 85mm 17.5mm 69mm -
RS Stock No. 791-3332
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F54206
THB2,191.12
Each
Units
2 6 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. 124-3156
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY4150-7
Brand :Siemens
THB1,620.51
Each
Units
1 50 A - Sentron 5SY4 230 V, 400 V Type C 10 kA - - 17.6mm 76.4mm 89.8mm Industrial, Plant Engineering
RS Stock No. 776-3076
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9N18369
THB19,680.13
Each
Units
3 125 A - Acti 9 C120N 440 V Type C 10 kA, 20 kA - ≤375V - - 81mm -
RS Stock No. 776-3225
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9N61537
THB5,241.57
Each
Units
2 40 A - Acti 9 C60H-DC - Type C 20 kA - 500V - - 81mm -
RS Stock No. 521-4951
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY6104-7
Brand :Siemens
THB986.33
Each
Units
1 4 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 791-3199
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F53210
THB1,946.08
Each
Units
2 10 A - Acti 9 iC60H 12 → 133 V, 220 → 240 V, 380 → 415 V, 440 V Type B 10 kA DIN Rail 100 → 133V 85mm 36mm 78.5mm -
RS Stock No. 776-3064
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9N18365
THB14,930.87
Each
Units
3 80 A - Acti 9 C120N 440 V Type C 10 kA, 20 kA - ≤375V 81mm 73mm 81mm -
RS Stock No. 622-0036
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY4104-7
Brand :Siemens
THB562.97
Each
Units
1 4 A - Sentron 5SY4 230 V, 400 V Type C 10 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 864-4403
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PLSM-C40/3-MW
THB2,409.64
Each
Units
3 40 A - XPole PLSM 230 V ac Type C 10 kA - 48V 52.5mm 80mm 75mm -
RS Stock No. 489-6675
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY6132-6
Brand :Siemens
THB443.91
Each
Units
1 32 A - Sentron 5SY6 230 V, 400 V Type B 6 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 488-7457
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CDS251001R0065 - S201B6
Brand :ABB
THB476.97
Each
Units
1 6 A - System M Pro S200 253 V Type B 6 kA - 72V 88mm 17.5mm 75.8mm -
RS Stock No. 734-9068
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F77210
THB1,790.83
Each
Units
2 10 A - Acti 9 iC60N 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V Type C 6 kA - 12 → 144V - 36mm - -
RS Stock No. 818-8571
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MG24114
THB2,116.44
Each
Units
1 6 A - Acti 9 C60 277 V Type B 5 kA - - 18mm 81mm 78.5mm -
RS Stock No. 772-1470
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY6006-7
Brand :Siemens
THB2,647.10
Each
Units
1 + N 6 A - Sentron 5SY6 230 V Type C 6 kA - - - 18mm 77mm -
RS Stock No. 734-9239
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F77206
THB2,551.98
Each
Units
2 6 A - Acti 9 iC60N 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V Type C 6 kA - 12 → 144V - - - -
Related Products
iC60N curve B, C, D circuit breakers are ...
Description:
iC60N curve B, C, D circuit breakers are multi-standard circuit breakers which combine circuit protection against short-circuit currents and circuit protection against overload currents. VisiSafe guarantees the downstream circuit is always safe regardless of overvoltage conditions, wear, or operator experience, ...
Miniature Circuit Breakers; Contact Position indicated by switch ...
Description:
Miniature Circuit Breakers; Contact Position indicated by switch levers. B, C and D curveVisisafe green strip indicates and guarantees the safe position of contactsVisiTrip red window on the front face indicates fault tripping allowing fast diagnosis, resolution, and re-closing loads ...
Acti 9 Schneider iC60N series multi-standard circuit breakers ...
Description:
Acti 9 Schneider iC60N series multi-standard circuit breakers combine circuit protection against short circuit currents and circuit protection against overload currents it also protects people against indirect contact with TN and IT neutral systems. Fully compliant with standards IEC/EN 60898 ...
C60H series multi-standard circuit breakers combine circuit protection ...
Description:
C60H series multi-standard circuit breakers combine circuit protection against short circuit currents and circuit protection against overload currents it also protects people against indirect contact with TN and IT neutral systems. Fully compliant with standards IEC/EN 60898 and IEC/EN 60947-2. ...