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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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Part Details Brand Stock Model Number Range Series Series Number of Poles Current Rating Tripping Characteristics Rated AC Voltage Rated DC Voltage Mounting Style Breaking Capacity Length Width Depth Application Special Features Tripping Mechanism Terminal Contact Type Reset Actuator Type
ABB MCB Mini Circuit Breaker
  • RS Stock No. 183-3786
  • Brand ABB
  • Mfr. Part No. GJF1101903R0004
ABB 0 SA1E - - - - - - - - - - 16mm 16mm 21mm - - - - -
ABB S201 MCB Mini Circuit Breaker, 1P, 10 A, 25 kA ABB 0 S201P - S201 S201 1P 10 A Type K 230 V - DIN Rail 25 kA 17.5mm 69mm 88mm Commercial, Industrial, Residential Thermal-Magnetic Overcurrent Protection Electro-Mechanic, Thermal-Magnetic Screw -
ABB S201 MCB Mini Circuit Breaker, 1P, 10 A, 6 kA ABB 0 S201L - S201 S201 1P 10 A Type C 400 V - DIN Rail 6 kA 17.5mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S201 MCB Mini Circuit Breaker, 1P, 16 A, 6 kA ABB 0 S201L - S201 S201 1P 16 A Type C 400 V - DIN Rail 6 kA 17.5mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S201 MCB Mini Circuit Breaker, 1P, 20 A, 6 kA ABB 0 S201L - S201 S201 1P 20 A Type C 400 V - DIN Rail 6 kA 17.5mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S201 MCB Mini Circuit Breaker, 1P, 25 A, 10 kA
  • RS Stock No. 183-3629
  • Brand ABB
  • Mfr. Part No. 2CDS251001R0254
ABB 0 S201 - S201 S201 1P 25 A Type C 400 V - DIN Rail 10 kA 17.5mm 69mm 88mm Commercial, Industrial, Residential Thermal-Magnetic Overcurrent Protection Electro-Mechanic, Thermal-Magnetic Screw -
ABB S201 MCB Mini Circuit Breaker, 1P, 3 A, 25 kA
  • RS Stock No. 183-3618
  • Brand ABB
  • Mfr. Part No. 2CDS281001R0317
ABB 0 S201P - S201 S201 1P 3 A Type K 230 V - DIN Rail 25 kA 17.5mm 69mm 88mm Commercial, Industrial, Residential Thermal-Magnetic Overcurrent Protection Electro-Mechanic, Thermal-Magnetic Screw -
ABB S201 MCB Mini Circuit Breaker, 1P, 6 A, 25 kA
  • RS Stock No. 183-3614
  • Brand ABB
  • Mfr. Part No. 2CDS281001R0377
ABB 0 S201P - S201 S201 1P 6 A Type K 230 V - DIN Rail 25 kA 17.5mm 69mm 88mm Commercial, Industrial, Residential Thermal-Magnetic Overcurrent Protection Electro-Mechanic, Thermal-Magnetic Screw -
ABB S202 MCB Mini Circuit Breaker, 2P, 10 A, 6 kA
  • RS Stock No. 183-3625
  • Brand ABB
  • Mfr. Part No. 2CDS242701R0104
ABB 0 S202L - S202 S202 2P 10 A Type C 400 V - DIN Rail 6 kA 35mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S202 MCB Mini Circuit Breaker, 2P, 16 A, 6 kA ABB 0 S202L - S202 S202 2P 16 A Type C 400 V - DIN Rail 6 kA 35mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S202 MCB Mini Circuit Breaker, 2P, 2 A, 10 kA
  • RS Stock No. 183-3616
  • Brand ABB
  • Mfr. Part No. 2CDS252001R0021
ABB 0 S202 - S202 S202 2P 2 A Type D 440 V 125V DIN Rail 10 kA 35mm 69mm 88mm Commercial, Industrial, Residential Thermal-Magnetic Overcurrent Protection Electro-Mechanic, Thermal-Magnetic Screw -
ABB S202 MCB Mini Circuit Breaker, 2P, 500 mA, 10 kA ABB 0 S202 - S202 S202 2P 500 mA Type C 440 V 125V DIN Rail 10 kA 35mm 69mm 88mm Commercial, Industrial, Residential Thermal-Magnetic Overcurrent Protection Electro-Mechanic, Thermal-Magnetic Screw -
ABB S202 MCB Mini Circuit Breaker, 2P, 6 A, 6 kA ABB 0 S202L - S202 S202 2P 6 A Type C 400 V - DIN Rail 6 kA 35mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S203 MCB Mini Circuit Breaker, 3P, 16 A, 6 kA
  • RS Stock No. 183-3662
  • Brand ABB
  • Mfr. Part No. 2CDS243701R0164
ABB 0 S203L - S203 S203 3P 16 A Type C 400 V - DIN Rail 6 kA 52.5mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S203 MCB Mini Circuit Breaker, 3P, 20 A, 6 kA ABB 0 S203L - S203 S203 3P 20 A Type C 400 V - DIN Rail 6 kA 52.5mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S204 MCB Mini Circuit Breaker, 4P, 10 A, 6 kA ABB 0 S204L - S204 S204 4P 10 A Type C 400 V - DIN Rail 6 kA 70mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S204 MCB Mini Circuit Breaker, 4P, 16 A, 6 kA ABB 0 S204L - S204 S204 4P 16 A Type C 400 V - DIN Rail 6 kA 70mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S204 MCB Mini Circuit Breaker, 4P, 20 A, 6 kA ABB 0 S204L - S204 S204 4P 20 A Type C 400 V - DIN Rail 6 kA 70mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S204 MCB Mini Circuit Breaker, 4P, 25 A, 6 kA ABB 0 S204L - S204 S204 4P 25 A Type C 400 V - DIN Rail 6 kA 70mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
ABB S204 MCB Mini Circuit Breaker, 4P, 32 A, 6 kA ABB 0 S204L - S204 S204 4P 32 A Type C 400 V - DIN Rail 6 kA 70mm 69mm 88mm Commercial, Industrial, Residential Busbar Slot in the Back for Best Visibility During Installation - Screw Toggle Switch
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