MCBs

pMCBs, 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./p h2How an MCB Works/h2 pWhen 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./p pMCBs 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./p h2MCB Types/h2 pMCBs 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:/p strongpType B - trips between 3 and 5 times the load currentstrong/p/strong pThis 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./p strongpType C - trips between 5 and 10 times the full load currentstrong/p/strong pThis 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./p strongpType D - trips between 10 and 20 times the full load currentstrong/p/strong pThis 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./p h2How to select a suitable MCB for the application?/h2 pFocus on 3 main points to choose the right MCB for the electrical circuit/p olliAmpere rating/li liShort circuit breaking cap

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Description Price Model Number Range Series Number of Poles Current Rating Tripping Characteristics Rated AC Voltage Mounting Style Rated DC Voltage Breaking Capacity Length Width Depth Application
RS Stock No. 791-3332
Mfr. Part No.A9F54206
£54.00
Each
Units
- Acti 9 iC60H 2 6 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 36mm 78.5mm -
RS Stock No. 791-3290
Mfr. Part No.A9F54106
£18.54
Each
Units
- Acti 9 iC60H 1 6 A Type C 100 → 133 V, 12 → 60 V, 220 → 240 V DIN Rail 72 V, 12 → 48 V 10 kA 85mm 18mm 78.5mm -
RS Stock No. 791-3297
Mfr. Part No.A9F54116
£16.56
Each
Units
- Acti 9 iC60H 1 16 A Type C 100 → 133 V, 12 → 60 V, 220 → 240 V DIN Rail 72 V, 12 → 48 V 10 kA 85mm 18mm 78.5mm -
RS Stock No. 791-3398
Mfr. Part No.A9F54332
£73.00
Each
Units
- Acti 9 iC60H 3 32 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 54mm 78.5mm -
RS Stock No. 791-3405
Mfr. Part No.A9F54363
£92.00
Each
Units
- Acti 9 iC60H 3 63 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 54mm 78.5mm -
RS Stock No. 791-3284
Mfr. Part No.A9F54102
£22.24
Each
Units
- Acti 9 iC60H 1 2 A Type C 100 → 133 V, 12 → 60 V, 220 → 240 V DIN Rail 72 V, 12 → 48 V 10 kA 85mm 18mm 78.5mm -
RS Stock No. 791-3293
Mfr. Part No.A9F54110
£16.56
Each
Units
- Acti 9 iC60H 1 10 A Type C 100 → 133 V, 12 → 60 V, 220 → 240 V DIN Rail 72 V, 12 → 48 V 10 kA 85mm 18mm 78.5mm -
RS Stock No. 791-3152
Mfr. Part No.A9F53106
£18.54
Each
Units
- Acti 9 iC60H 1 6 A Type B 100 → 133 V, 12 → 60 V, 220 → 240 V DIN Rail 72 V, 12 → 48 V 10 kA 85mm 18mm 78.5mm -
RS Stock No. 791-3574
Mfr. Part No.A9F55332
£77.00
Each
Units
- Acti 9 iC60H 3 32 A Type D 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 54mm 78.5mm -
RS Stock No. 791-3341
Mfr. Part No.A9F54210
£49.00
Each
Units
- Acti 9 iC60H 2 10 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 36mm 78.5mm -
RS Stock No. 791-3344
Mfr. Part No.A9F54216
£49.00
Each
Units
- Acti 9 iC60H 2 16 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 36mm 78.5mm -
RS Stock No. 791-3326
Mfr. Part No.A9F54202
£63.00
Each
Units
- Acti 9 iC60H 2 2 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 36mm 78.5mm -
RS Stock No. 791-3281
Mfr. Part No.A9F54104
£19.68
Each
Units
- Acti 9 iC60H 1 4 A Type C 100 → 133 V, 12 → 60 V, 220 → 240 V DIN Rail 72 V, 12 → 48 V 10 kA 85mm 18mm 78.5mm -
RS Stock No. 791-3382
Mfr. Part No.A9F54316
£73.00
Each
Units
- Acti 9 iC60H 3 16 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 54mm 78.5mm -
RS Stock No. 489-6625
Mfr. Part No.5SY6106-7
BrandSiemens
£13.30
Each
Units
- Sentron 5SY6 1 6 A Type C 230 V, 400 V - - 6 kA 89.8mm 17.6mm 76.4mm -
RS Stock No. 791-3146
Mfr. Part No.A9F53102
£22.52
Each
Units
- Acti 9 iC60H 1 2 A Type B 100 → 133 V, 12 → 60 V, 220 → 240 V DIN Rail 72 V, 12 → 48 V 10 kA 85mm 18mm 78.5mm -
RS Stock No. 521-4939
Mfr. Part No.5SY6102-7
BrandSiemens
£14.56
Each
Units
- Sentron 5SY6 1 2 A Type C 230 V, 400 V - - 6 kA 89.8mm 17.6mm 76.4mm -
RS Stock No. 791-3348
Mfr. Part No.A9F54220
£49.00
Each
Units
- Acti 9 iC60H 2 20 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 36mm 78.5mm -
RS Stock No. 791-3388
Mfr. Part No.A9F54310
£73.00
Each
Units
- Acti 9 iC60H 3 10 A Type C 440 V, 12 → 133 V, 220 → 240 V, 380 → 415 V DIN Rail 100 → 133V 10 kA 85mm 54mm 78.5mm -
RS Stock No. 132-122
Mfr. Part No.2CDS272001R0164
BrandABB
£40.88
Each
Units
- System M Pro S200 2 16 A Type C 440 V - 125V 10 kA 88mm 35mm 75.8mm -
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Description:
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Miniature Circuit Breakers up to 63A with positive ...
Description:
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Miniature Circuit Breakers; Contact Position indicated by switch ...
Description:
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