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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Description 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. 532-5118
Mfr. Part No.FAZ-S2/2
BrandEaton
PHP3,728.30
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2 2 A - xEffect FAZ 230 V Type S 10 kA - - 80mm 35mm 73.5mm -
RS Stock No. 776-3496
Mfr. Part No.A9F77306
PHP8,506.37
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3 6 A - Acti 9 iC60N 440 V Type C 6 kA - 180V - - 85mm -
RS Stock No. 791-3192
Mfr. Part No.A9F53216
PHP4,503.50
Each
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2 16 A - Acti 9 iC60H 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V Type B 10 kA DIN Rail 100 → 133V 85mm 36mm 78.5mm -
RS Stock No. 791-3442
Mfr. Part No.A9F54432
PHP9,416.07
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4 32 A - Acti 9 iC60H 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V Type C 10 kA DIN Rail 220 → 250V 85mm 72mm 78.5mm -
RS Stock No. 734-9239
Mfr. Part No.A9F77206
PHP5,184.59
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2 6 A - Acti 9 iC60N 100 → 130 V, 12 → 60 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V Type C 6 kA - 12 → 144V - - - -
RS Stock No. 532-5152
Mfr. Part No.FAZ-S10/2
BrandEaton
PHP3,069.17
Each
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2 10 A - xEffect FAZ 230 V Type S 10 kA - - 80mm 35mm 73.5mm -
RS Stock No. 791-3382
Mfr. Part No.A9F54316
PHP6,076.30
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3 16 A - Acti 9 iC60H 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V Type C 10 kA DIN Rail 100 → 133V 85mm 54mm 78.5mm -
RS Stock No. 435-396
Mfr. Part No.2CCS893001R0824
BrandABB
PHP15,585.30
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3 100 A - High Performance S800 400 V, 690 V Type C 36 kA - - - 79.5mm 88.5mm -
RS Stock No. 791-3322
Mfr. Part No.A9F54201
PHP6,068.20
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2 1 A - Acti 9 iC60H 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V Type C 10 kA DIN Rail 100 → 133V 85mm 36mm 78.5mm -
RS Stock No. 776-3389
Mfr. Part No.A9F76210
PHP6,449.16
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2 10 A - Acti 9 iC60N 440 V Type B 6 kA - 125V - - 85mm -
RS Stock No. 521-4951
Mfr. Part No.5SY6104-7
BrandSiemens
PHP1,828.39
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1 4 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 772-1290
Mfr. Part No.5SY4206-8
BrandSiemens
PHP3,636.47
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2 6 A - Sentron 5SY4 400 V Type D 10 kA - - 90mm 36mm 76mm -
RS Stock No. 791-3385
Mfr. Part No.A9F54306
PHP6,604.80
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3 6 A - Acti 9 iC60H 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V Type C 10 kA DIN Rail 100 → 133V 85mm 54mm 78.5mm -
RS Stock No. 798-2205
Mfr. Part No.EUB16B
BrandEuropa
PHP192.21
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- - - - - - - - - - - - - -
RS Stock No. 622-0294
Mfr. Part No.5SY7132-6
BrandSiemens
PHP1,388.26
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1 32 A - Sentron 5SY7 230 V, 400 V Type B 15 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 772-1287
Mfr. Part No.5SY4202-8
BrandSiemens
PHP5,142.80
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2 2 A - Sentron 5SY4 400 V Type D 10 kA - - 90mm 36mm 76mm -
RS Stock No. 124-3151
Mfr. Part No.5SY4101-8
BrandSiemens
PHP1,863.34
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1 1 A - Sentron 5SY4 230 V, 400 V Type D 10 kA - - 17.6mm 76.4mm 89.8mm Industrial, Plant Engineering
RS Stock No. 532-5168
Mfr. Part No.FAZ-S16/2
BrandEaton
PHP3,069.17
Each
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2 16 A - xEffect FAZ 230 V Type S 10 kA - - 80mm 35mm 73.5mm -
RS Stock No. 772-1307
Mfr. Part No.5SY4210-8
BrandSiemens
PHP4,511.59
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2 10 A - Sentron 5SY4 400 V Type D 10 kA - - 90mm 36mm 76mm -
RS Stock No. 791-3326
Mfr. Part No.A9F54202
PHP5,368.06
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2 2 A - Acti 9 iC60H 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V Type C 10 kA DIN Rail 100 → 133V 85mm 36mm 78.5mm -
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