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 Breaking Capacity at Maximum Voltage Rating Length Width Depth
RS-stocknr. 825-5706
FabrikantnummerP1MB2PC01
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25,44 €
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2 1 A - ModuLo P1MB Type C 230 V, 400V 80V - - 10 kA 86.5mm 36mm 79.52mm
RS-stocknr. 825-5769
FabrikantnummerP1MB2PD16
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24,06 €
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2 16 A - ModuLo P1MB Type D 230 V, 400V 80V - - 10 kA 86.5mm 36mm 79.52mm
RS-stocknr. 825-5728
FabrikantnummerP1MB2PC20
FabrikantLovato
22,15 €
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2 20 A - ModuLo P1MB Type C 230 V, 400V 80V - - 10 kA 86.5mm 36mm 79.52mm
RS-stocknr. 825-5652
FabrikantnummerP1MB1PD40
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10,80 €
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Aantal stuks
1 40 A - ModuLo P1MB Type D 230V 60V - - 10 kA 86.5mm 18mm 79.52mm
RS-stocknr. 825-5716
FabrikantnummerP1MB2PC10
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22,15 €
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Aantal stuks
2 10 A - ModuLo P1MB Type C 230 V, 400V 80V - - 10 kA 86.5mm 36mm 79.52mm
RS-stocknr. 825-5633
FabrikantnummerP1MB1PD10
FabrikantLovato
10,80 €
Each
Aantal stuks
1 10 A - ModuLo P1MB Type D 230V 60V - - 10 kA 86.5mm 18mm 79.52mm
RS-stocknr. 825-5804
FabrikantnummerP1MB3PB16
FabrikantLovato
37,64 €
Each
Aantal stuks
3 16 A - ModuLo P1MB Type B 230 V, 400V - - - 10 kA 86.5mm 54mm 79.52mm
RS-stocknr. 825-5630
FabrikantnummerP1MB1PD06
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10,89 €
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Aantal stuks
1 6 A - ModuLo P1MB Type D 230V 60V - - 10 kA 86.5mm 18mm 79.52mm
RS-stocknr. 825-6175
FabrikantnummerP2MB4PC080
FabrikantLovato
144,64 €
Each
Aantal stuks
4 80 A - ModuLo P2MB Type C 230 V, 400V 60V - - 10 kA 85mm 108mm 80mm
RS-stocknr. 825-5680
FabrikantnummerP1MB2PB20
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24,06 €
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2 20 A - ModuLo P1MB Type B 230 V, 400V 80V - - 10 kA 86.5mm 36mm 79.52mm
RS-stocknr. 825-5725
FabrikantnummerP1MB2PC16
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22,15 €
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2 16 A - ModuLo P1MB Type C 230 V, 400V 80V - - 10 kA 86.5mm 36mm 79.52mm
RS-stocknr. 825-5589
FabrikantnummerP1MB1PC01
FabrikantLovato
10,89 €
Each
Aantal stuks
1 1 A - ModuLo P1MB Type C 230V 60V - - 10 kA 86.5mm 18mm 79.52mm
RS-stocknr. 825-5586
FabrikantnummerP1MB1PC04
FabrikantLovato
10,89 €
Each
Aantal stuks
1 4 A - ModuLo P1MB Type C 230V 60V - - 10 kA 86.5mm 18mm 79.52mm
RS-stocknr. 825-5832
FabrikantnummerP1MB3PC04
FabrikantLovato
42,31 €
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3 4 A - ModuLo P1MB Type C 230 V, 400V - - - 10 kA 86.5mm 54mm 79.52mm
RS-stocknr. 825-5700
FabrikantnummerP1MB2PC02
FabrikantLovato
25,44 €
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Aantal stuks
2 2 A - ModuLo P1MB Type C 230 V, 400V 80V - - 10 kA 86.5mm 36mm 79.52mm
RS-stocknr. 825-5719
FabrikantnummerP1MB2PC04
FabrikantLovato
25,44 €
Each
Aantal stuks
2 4 A - ModuLo P1MB Type C 230 V, 400V 80V - - 10 kA 86.5mm 36mm 79.52mm
RS-stocknr. 825-6188
FabrikantnummerP2MB4PC125
FabrikantLovato
188,10 €
Each
Aantal stuks
4 125 A - ModuLo P2MB Type C 230 V, 400V 60V - - 10 kA 85mm 108mm 80mm
RS-stocknr. 825-5605
FabrikantnummerP1MB1PC25
FabrikantLovato
10,57 €
Each
Aantal stuks
1 25 A - ModuLo P1MB Type C 230V 60V - - 10 kA 86.5mm 18mm 79.52mm
RS-stocknr. 825-5609
FabrikantnummerP1MB1PC32
FabrikantLovato
10,57 €
Each
Aantal stuks
1 32 A - ModuLo P1MB Type C 230V 60V - - 10 kA 86.5mm 18mm 79.52mm
RS-stocknr. 825-6147
FabrikantnummerP2MB1PC080
FabrikantLovato
45,57 €
Each
Aantal stuks
1 80 A - ModuLo P2MB Type C 230V 60V - - 10 kA 85mm 27mm 80mm