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. 812-9468
PHP533.54
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1 40 A - Domae DOM 230 V Type C 6 kA - - - - - -
RS Stock No. 776-3048
Mfr. Part No.A9N18523
PHP44,158.63
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4 80 A - Acti 9 C120H 440 V Type D 15 kA, 30 kA - ≤500V - - 81mm -
RS Stock No. 532-5124
Mfr. Part No.FAZ-S3/2
BrandEaton
PHP3,417.93
Each
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2 3 A - xEffect FAZ 230 V Type S 10 kA - - 80mm 35mm 73.5mm -
RS Stock No. 620-2870
Mfr. Part No.0 225 03
BrandLegrand
PHP6,203.69
Each
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2 32 A - - Vistop 400 V - 5 kA - - 92mm 98.5mm 69.5mm -
RS Stock No. 435-572
Mfr. Part No.2CCS892001R0824
BrandABB
PHP9,742.63
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2 100 A - High Performance S800 400 V, 690 V Type C 36 kA - - - 53mm 88.5mm -
RS Stock No. 847-3627
Mfr. Part No.FAZ-D5/2
BrandEaton
PHP3,281.42
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2 5 A - xEffect FAZ 240 → 415 V Type D 10 kA - - 36mm 84.7mm 72.6mm -
RS Stock No. 486-861
Mfr. Part No.PXL-C5/1
BrandEaton
PHP1,535.74
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1 5 A - xPole PXL, S200 400 V Type C 10 kA - 48V 17.5mm 80mm 60mm -
RS Stock No. 734-9400
Mfr. Part No.A9F94210
PHP7,691.50
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2 10 A - Acti 9 iC60L 100 → 130 V, 12 → 60 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V Type C 10 kA - 12 → 144V - 36mm - -
RS Stock No. 922-6920
Mfr. Part No.FAZ-C32/1-NA
BrandEaton
PHP1,648.94
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1 32 A - xEffect FAZ 240 → 415 V Type C 10 kA - 48V 17.8mm 65.5mm 80mm Computers, Control Instrumentation, External Load Circuit, HACR Internal/External Equipment, Internal/External Convenience Receptacle Circuit, Motor Control Circuit, PLC I/O Point, Power Conditioner, Power Supplies, Relay, Uninterruptable Power Supplies
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PHP495.43
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1 20 A - Domae DOM 230 V Type C 6 kA - - - - - -
RS Stock No. 539-8374
Mfr. Part No.2CDS213001R0324
BrandABB
PHP2,875.36
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3 32 A - System M Pro S200 440 V Type C 6 kA - - 85mm 52.5mm 69mm -
RS Stock No. 922-6961
Mfr. Part No.FAZ-B10/1
BrandEaton
PHP1,169.80
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1 10 A - xEffect FAZ 240 V Type B 10 kA - 48V 17.8mm 65.5mm 80mm Appliances, Business Equipment, Control Circuit, Lighting, Supplementary Protection
RS Stock No. 849-6531
Mfr. Part No.EUC2P2C
BrandEuropa
PHP899.92
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2 2 A - EU EUC 230/400 V Type C 10 kA - - 36mm 78mm 87mm -
RS Stock No. 814-7481
Mfr. Part No.60150
PHP11,004.00
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2 35 A - - C60 120 → 240 V Type C 20 kA - 125V 107mm 36mm 78.5mm -
RS Stock No. 622-0143
Mfr. Part No.5SY7101-7
BrandSiemens
PHP1,530.54
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1 1 A - Sentron 5SY7 230 V, 400 V Type C 15 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 825-6172
Mfr. Part No.P2MB3PC125
BrandLovato
PHP9,507.45
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3 125 A - ModuLo P2MB 230 V, 400 V Type C 10 kA - 60V 85mm 81mm 80mm -
RS Stock No. 622-0008
Mfr. Part No.5SY4101-7
BrandSiemens
PHP1,250.10
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1 1 A - Sentron 5SY4 230 V, 400 V Type C 10 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 132-100
Mfr. Part No.2CDS272001R0135
BrandABB
PHP3,136.40
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2 13 A - System M Pro S200 440 V Type B 10 kA - 125V 88mm 35mm 75.8mm -
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Mfr. Part No.7206.2000.7
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PHP1,661.86
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2 6 A - - GREEN ELECTRIC 230 → 400 V Type B 10 kA - 60V - - - -
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1 16 A - Domae DOM 230 V Type C 6 kA - - - - - -
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