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
TWD174.00
Each
units
20 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8622
Mfr. Part No.EZ9F66116
TWD174.00
Each
units
16 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8606
Mfr. Part No.EZ9F16120
TWD174.00
Each
units
20 A - 1 Type B EZ9 Easy 9 - - - - - -
New
RS Stock No. 200-6171
Mfr. Part No.A9PA2720
TWD5,419.00
Each
units
20 A IDD40T XA 3 Type C - Acti9 - - - - - -
RS Stock No. 850-8628
Mfr. Part No.EZ9F66110
TWD174.00
Each
units
10 A - 1 Type C EZ9 Easy 9 - - - - - -
New
RS Stock No. 200-6149
Mfr. Part No.A9PE4616
TWD2,755.00
Each
units
16 A IDT40N XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6172
Mfr. Part No.A9PA2725
TWD6,005.00
Each
units
25 A IDD40T XA 3 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6153
Mfr. Part No.A9PA2620
TWD1,380.00
Each
units
20 A IDT40N XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6165
Mfr. Part No.A9PE2610
TWD1,225.00
Each
units
10 A IDD40T XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6150
Mfr. Part No.A9PA4620
TWD3,022.00
Each
units
20 A IDT40N XA 1 Type C - Acti9 - - - - - -
RS Stock No. 850-8593
Mfr. Part No.EZ9F16110
TWD174.00
Each
units
10 A - 1 Type B EZ9 Easy 9 - - - - - -
New
RS Stock No. 200-6174
Mfr. Part No.A9PA4732
TWD6,406.00
Each
units
32 A IDD40T XA 3 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6159
Mfr. Part No.A9PA2732
TWD6,172.00
Each
units
32 A IDD40T XA 3 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6154
Mfr. Part No.A9PE2620
TWD1,340.00
Each
units
20 A IDT40N XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6148
Mfr. Part No.A9PA4616
TWD2,838.00
Each
units
16 A IDT40N XA 1 Type C - Acti9 - - - - - -
RS Stock No. 850-8638
Mfr. Part No.EZ9F66140
TWD174.00
Each
units
40 A - 1 Type C EZ9 Easy 9 - - - - - -
RS Stock No. 850-8612
Mfr. Part No.EZ9F16140
TWD174.00
Each
units
40 A - 1 Type B EZ9 Easy 9 - - - - - -
New
RS Stock No. 200-6168
Mfr. Part No.A9PE2616
TWD1,225.00
Each
units
16 A IDD40T XA 1 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6161
Mfr. Part No.A9DA3732
TWD18,609.00
Each
units
32 A IDD40N 3 Type C - Acti9 - - - - - -
New
RS Stock No. 200-6169
Mfr. Part No.A9PA2616
TWD1,261.00
Each
units
16 A IDD40T XA 1 Type C - Acti9 - - - - - -