Residential MCBs

Residential MCBs (miniature circuit breakers) are used in domestic consumer units and switch fuses to break the circuit in case of a fault. They are usually used to protect small appliances or control circuits, and have a fixed trip setting.

How do residential MCBs work?

Residential MCBs are a very low voltage type of circuit breaker. When a current or voltage is interrupted, an arc is generated, which must be controlled and extinguished so that the circuit can function again.

MCBs utilise air alone to break the arc by dividing it into smaller arcs using a series of insulated parallel metal plates known as arc chutes to cool each section down separately. Once the fault is fixed, the contacts are closed once more to restore power to the circuit.

Types of residential MCBs

Residential MCBs can have differing current and voltage ratings, lead times and numbers of poles. Their dimensions can also vary, though all are relatively small.


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Description Price Current Rating Number of Poles Tripping Characteristics Series Range Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Mounting Style Overall Depth Overall Dimensions Overall Length Overall Width Rated AC Voltage Tripping Mechanism
RS Stock No. 191-7202
Mfr. Part No.ALB061
BrandEaton
HK$106.34
Each
units
6 A 1 Type B ALB Memera - - - - - - - - -
RS Stock No. 191-7218
Mfr. Part No.ALB101
BrandEaton
HK$112.94
Each
units
10 A 1 Type B ALB Memera - - - - - - - - -
RS Stock No. 191-7268
Mfr. Part No.ALB401
BrandEaton
HK$118.15
Each
units
40 A 1 Type B ALB Memera - - - - - - - - -
RS Stock No. 191-7224
Mfr. Part No.ALB161
BrandEaton
HK$112.94
Each
units
16 A 1 Type B ALB Memera - - - - - - - - -
RS Stock No. 229-7919
Mfr. Part No.ALB501
BrandEaton
HK$106.34
Each
units
50 A 1 Type B ALB Memera - - - - - - - - -
RS Stock No. 191-7230
Mfr. Part No.ALB201
BrandEaton
HK$109.65
Each
units
20 A 1 Type B ALB Memera - - - - - - - - -
RS Stock No. 191-7252
Mfr. Part No.ALB321
BrandEaton
HK$109.65
Each
units
32 A 1 Type B ALB Memera - - - - - - - - -