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. 850-8631
Mfr. Part No.EZ9F66120
TWD117.00
Each
units
20 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8622
Mfr. Part No.EZ9F66116
TWD117.00
Each
units
16 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8606
Mfr. Part No.EZ9F16120
TWD117.00
Each
units
20 A - 1 Type B EZ9 Easy 9 - - - - - -
RS Stock No. 200-6152
Mfr. Part No.A9PE4620
TWD2,127.00
Each
units
20 A IDT40N XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 211-2413
Mfr. Part No.M9F42130
TWD1,336.00
Each
units
30 A M9F42130 1 Type C C60BP Multi 9 - - - - - -
RS Stock No. 200-6153
Mfr. Part No.A9PA2620
TWD1,000.00
Each
units
20 A IDT40N XA 1 Type C - Acti9 - - - - - -
RS Stock No. 200-6161
Mfr. Part No.A9DA3732
TWD13,487.00
Each
units
32 A IDD40N 3 Type C - Acti9 - - - - - -
New
RS Stock No. 211-2426
Mfr. Part No.M9F42305
TWD4,199.00
Each
units
5 A M9F42305 3 Type C C60BP Multi 9 - - - - - -
New
RS Stock No. 211-2338
Mfr. Part No.M9F21150
TWD749.00
Each
units
50 A M9F21150 1 Type B C60SP Multi 9 - - - - - -
New
RS Stock No. 211-2351
Mfr. Part No.M9F21425
TWD2,590.00
Each
units
25 A M9F21425 4 Type B C60SP Multi 9 - - - - - -
New
RS Stock No. 211-2427
Mfr. Part No.M9F42306
TWD3,885.00
Each
units
6 A M9F42306 3 Type C C60BP Multi 9 - - - - - -
New
RS Stock No. 211-2432
Mfr. Part No.M9F42340
TWD4,180.00
Each
units
40 A M9F42340 3 Type C C60BP Multi 9 - - - - - -
New
RS Stock No. 211-2434
Mfr. Part No.M9F42363
TWD4,494.00
Each
units
63 A M9F42363 3 Type C C60BP Multi 9 - - - - - -
RS Stock No. 200-6154
Mfr. Part No.A9PE2620
TWD971.00
Each
units
20 A IDT40N XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 211-2418
Mfr. Part No.M9F42208
TWD2,763.00
Each
units
8 A M9F42208 2 Type C C60BP Multi 9 - - - - - -
New
RS Stock No. 211-2365
Mfr. Part No.M9F22170
TWD1,189.00
Each
units
500 mA M9F22170 1 Type C C60SP Multi 9 - - - - - -
RS Stock No. 200-6162
Mfr. Part No.A9DV2625
TWD6,774.00
Each
units
25 A IDD40T TG 1 Type C - Acti9 - - - - - -
RS Stock No. 200-6157
Mfr. Part No.A9DP2616
TWD6,331.00
Each
units
16 A IDD40T XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 211-2445
Mfr. Part No.M9F43204
TWD2,935.00
Each
units
4 A M9F43204 2 Type D C60BP Multi 9 - - - - - -
New
RS Stock No. 211-2384
Mfr. Part No.M9F23104
TWD638.00
Each
units
4 A M9F23104 1 Type D C60SP Multi 9 - - - - - -