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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Omschrijving Prijs Number of Poles Current Rating Model Number Range Series Tripping Characteristics Rated AC Voltage Rated DC Voltage Breaking Capacity Mounting Style Length Width Depth Application
RS-stocknr. 776-6707
FabrikantnummerA9N21557
39,99 €
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1 + N 16 A - Acti 9 iDPN Type C 230 V - 10 kA - - 70mm 80mm -
RS-stocknr. 734-9131
FabrikantnummerA9F74202
103,20 €
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2 2 A - Acti 9 iC60N Type C 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V 12 → 144V 6 kA - - 36mm - -
RS-stocknr. 776-2698
FabrikantnummerA9N21555
48,24 €
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1 + N 6 A - Acti 9 iDPN Type C 230 V - 10 kA - 18mm - 80mm -
RS-stocknr. 776-2685
FabrikantnummerA9N21553
53,08 €
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1 + N 2 A - Acti 9 iDPN Type C 230 V - 10 kA - - 70mm 80mm -
RS-stocknr. 776-2691
FabrikantnummerA9N21556
48,24 €
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1 + N 10 A - Acti 9 iDPN Type C 230 V - 10 kA - 18mm - 80mm -
RS-stocknr. 734-9220
FabrikantnummerA9F74204
103,20 €
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2 4 A - Acti 9 iC60N Type C 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V 12 → 144V 6 kA - - - - -
RS-stocknr. 776-6732
FabrikantnummerA9N21600
117,16 €
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3 + N 32 A - Acti 9 iDPN Type C 400 V - 10 kA - - - 80mm -
RS-stocknr. 776-6726
FabrikantnummerA9N21597
99,99 €
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3 + N 16 A - Acti 9 iDPN Type C 400 V - 10 kA - - 70mm 80mm -
RS-stocknr. 734-9264
FabrikantnummerA9F74203
103,20 €
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2 3 A - Acti 9 iC60N Type C 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V 12 → 144V 6 kA - - 36mm - -
RS-stocknr. 776-6741
FabrikantnummerA9N21601
141,40 €
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3 + N 40 A - Acti 9 iDPN Type C 400 V - 10 kA - 54mm 70mm 80mm -
RS-stocknr. 776-6700
FabrikantnummerA9N21558
49,23 €
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1 + N 20 A - Acti 9 iDPN Type C 230 V - 10 kA - 18mm 70mm 80mm -
RS-stocknr. 734-9661
FabrikantnummerA9F75210
66,83 €
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2 10 A - Acti 9 iC60N Type D 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V 12 → 144V 6 kA - - - - -
RS-stocknr. 776-6738
FabrikantnummerA9N21599
110,09 €
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3 + N 25 A - Acti 9 iDPN Type C 400 V - 10 kA - - 70mm 80mm -
RS-stocknr. 776-2682
FabrikantnummerA9N21552
53,08 €
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1 + N 1 A - Acti 9 iDPN Type C 230 V - 10 kA - 18mm - 80mm -
RS-stocknr. 776-2689
FabrikantnummerA9N21554
53,08 €
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1 + N 3 A - Acti 9 iDPN Type C 230 V - 10 kA - - 70mm 80mm -
RS-stocknr. 776-6735
FabrikantnummerA9N21598
78,67 €
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3 + N 20 A - Acti 9 iDPN Type C 400 V - 10 kA - - 70mm 80mm -
RS-stocknr. 734-9664
FabrikantnummerA9F75216
66,83 €
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2 16 A - Acti 9 iC60N Type D 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V 12 → 144V 6 kA - - 36mm - -
RS-stocknr. 734-9652
FabrikantnummerA9F75206
81,66 €
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Aantal stuks
2 6 A - Acti 9 iC60N Type D 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V 12 → 144V 6 kA - - - - -
RS-stocknr. 776-6729
FabrikantnummerA9N21596
106,05 €
Each
Aantal stuks
3 + N 10 A - Acti 9 iDPN Type C 400 V - 10 kA - - 70mm 80mm -
RS-stocknr. 734-9686
FabrikantnummerA9F75332
121,80 €
Each
Aantal stuks
3 32 A - Acti 9 iC60N Type D 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V 12 → 144V 6 kA - - 54mm - -
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