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 Model Number Number of Poles Tripping Characteristics Series Range Circuit Breaker Type Mounting Style Overall Depth Overall Width Rated AC Voltage Tripping Mechanism
RS Stock No. 850-8599
Mfr. Part No.EZ9F16106
HK$56.64
Each
units
6 A - 1 Type B EZ9 Easy 9 MCB DIN Rail Mount 72mm 18mm 230V Thermal-Magnetic
RS Stock No. 850-8596
Mfr. Part No.EZ9F16103
HK$49.43
Each
units
3 A - 1 Type B EZ9 Easy 9 - - - - - -
RS Stock No. 850-8593
Mfr. Part No.EZ9F16110
HK$36.53
Each
units
10 A - 1 Type B EZ9 Easy 9 - - - - - -
RS Stock No. 850-8628
Mfr. Part No.EZ9F66110
HK$49.43
Each
units
10 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8634
Mfr. Part No.EZ9F66132
HK$52.68
Each
units
32 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8638
Mfr. Part No.EZ9F66140
HK$31.98
Each
units
40 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8625
Mfr. Part No.EZ9F66106
HK$49.43
Each
units
6 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8631
Mfr. Part No.EZ9F66120
HK$47.99
Each
units
20 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8612
Mfr. Part No.EZ9F16140
HK$31.98
Each
units
40 A - 1 Type B EZ9 Easy 9 - - - - - -
New
RS Stock No. 211-2371
Mfr. Part No.M9F22263
HK$514.03
Each
units
63 A M9F22263 2 Type C C60SP Multi 9 - - - - - -
New
RS Stock No. 211-2387
Mfr. Part No.M9F23108
HK$164.19
Each
units
8 A M9F23108 1 Type D C60SP Multi 9 - - - - - -
New
RS Stock No. 211-2372
Mfr. Part No.M9F22302
HK$530.01
Each
units
2 A M9F22302 3 Type C C60SP Multi 9 - - - - - -
New
RS Stock No. 211-2426
Mfr. Part No.M9F42305
HK$1,147.15
Each
units
5 A M9F42305 3 Type C C60BP Multi 9 - - - - - -
RS Stock No. 200-6146
Mfr. Part No.A9PA4610
HK$539.20
Each
units
10 A IDT40N XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 211-2382
Mfr. Part No.M9F22463
HK$795.45
Each
units
63 A M9F22463 4 Type C C60SP Multi 9 - - - - - -
New
RS Stock No. 211-2435
Mfr. Part No.M9F43103
HK$376.28
Each
units
3 A M9F43103 1 Type D C60BP Multi 9 - - - - - -
New
RS Stock No. 211-2427
Mfr. Part No.M9F42306
HK$1,018.74
Each
units
6 A M9F42306 3 Type C C60BP Multi 9 - - - - - -
New
RS Stock No. 211-2373
Mfr. Part No.M9F22306
HK$515.59
Each
units
6 A M9F22306 3 Type C C60SP Multi 9 - - - - - -
RS Stock No. 180-6101
Mfr. Part No.0 058 48
BrandLegrand
HK$1,045.29
1 Box of 2
Box(es)
- - - - - - - - - - - -
RS Stock No. 200-6172
Mfr. Part No.A9PA2725
HK$1,527.71
Each
units
25 A IDD40T XA 3 Type C - Acti9 - - - - - -